diff --git a/A-gent.cabal b/A-gent.cabal
new file mode 100644
--- /dev/null
+++ b/A-gent.cabal
@@ -0,0 +1,177 @@
+cabal-version: 3.6
+
+--------------------------------------------------------------------------------
+--
+-- Λ-gent, (c) 2026 SPISE MISU ApS, https://spdx.org/licenses/SSPL-1.0
+--
+--------------------------------------------------------------------------------
+
+build-type: Simple
+                                              
+name: A-gent
+version: 0.11.0.18
+
+synopsis: Polite & well educated LLM agent with excellent manners that always behaves well
+description: Polite and well educated LLM agent with excellent manners that always behaves well
+             
+homepage: https://a-gent.org
+          
+license: SSPL-1.0 OR AGPL-3.0-only
+license-file: LICENSE.md
+              
+author: SPISE MISU
+maintainer: SPISE MISU <mail+hackage@spisemisu.com>
+copyright: (c) 2026 SPISE MISU ApS
+           
+stability: experimental
+           
+category: Agent, LLM
+          
+extra-doc-files: README.md, CHANGELOG.md
+
+tested-with:
+  GHC == 9.4.8
+  GHC == 9.6.7
+  GHC == 9.8.4
+  GHC == 9.10.3
+  GHC == 9.12.2
+                 
+source-repository head
+  type:
+      git
+  location:
+      https://gitlab.com/a-gent/a-gent
+                
+--------------------------------------------------------------------------------
+-- COMMON
+--------------------------------------------------------------------------------
+
+common base
+  default-extensions:
+      Safe
+  default-language:
+      Haskell2010
+  build-depends:
+      -- Prelude
+      base       >= 4        && < 5
+      -- Process
+      -- NOTE: github.com/NixOS/hydra builds with stackage lastest LST (24.…)
+      -- and stackage only has 'containers 0.7' while hackage has '0.8'
+    , process    >= 1.6.25.0 && < 2
+    , containers >= 0.7      && < 1
+      -- JSON
+    , mtl        >= 2.3.1    && < 3
+  ghc-options:
+      --------------------------------------------------------------------------
+      -- GHC 9.10.3 Users Guide
+      -- 9. Using GHC > 9.2. Warnings and sanity-checking
+      -- * Base: https://downloads.haskell.org/~ghc/9.10.3/docs/users_guide/
+      -- * File: using-warnings.html
+      -- Warnings that are not enabled by -Wall:
+      --------------------------------------------------------------------------
+      -Wall
+      -Wincomplete-record-updates
+      -- -Wmonomorphism-restriction
+      -- -Wimplicit-prelude
+      -- -Wmissing-local-signatures
+      -Wmissing-exported-signatures
+      -- -Wmissing-export-lists
+      -- -Wmissing-import-lists
+      -Wmissing-home-modules
+      -Widentities
+      -- -Wredundant-constraints
+      -- Added since GHC 8.4
+      -Wpartial-fields 
+      -- -Wmissed-specialisations
+      -- -Wall-missed-specialisations
+      --------------------------------------------------------------------------
+      -- Added to allow instance definition in other files, in order to keep the 
+      -- Effect module SAFE so it can be imported by the Process
+      --------------------------------------------------------------------------
+      -Wno-orphans
+      -- Makes any warning into a fatal error.
+      -- -Werror
+      --------------------------------------------------------------------------
+      -- Deterministic builds (Uniques):
+      -- * https://gitlab.haskell.org/ghc/ghc/wikis/deterministic-builds#progress
+      -- * https://www.youtube.com/watch?v=FNzTk4P4fL4 (08 GHC Determinism ICFP)
+      --------------------------------------------------------------------------
+      -- -dinitial-unique=0
+      -- -dunique-increment=1
+      --------------------------------------------------------------------------
+      -- GHC 9.10.3 Users Guide
+      -- 19. Known bugs and infelicities >
+      -- 19.1. Haskell standards vs. Glasgow Haskell: language non-compliance >
+      -- 19.1.1.3. Expressions and pointers
+      -- * Base: https://downloads.haskell.org/~ghc/9.10.3/docs/users_guide/
+      -- * File: bugs.html
+      --------------------------------------------------------------------------
+      -fpedantic-bottoms
+      -- To use when GHC uses to many ticks:
+      -- -ddump-simpl-stats
+      -- -fsimpl-tick-factor=100
+      --------------------------------------------------------------------------
+      -- GHC 9.10.3 Users Guide
+      -- 12.40. Safe Haskell > ... > 12.40.1.1. Strict type-safety (good style)
+      -- * Enforce good style, similar to the function of -Wall.
+      -- Only Trustworthy packages can be trusted
+      -- * Base: https://downloads.haskell.org/~ghc/9.10.3/docs/users_guide/
+      -- * File: safe_haskell.html
+      --------------------------------------------------------------------------
+      -fpackage-trust
+      -- Base
+      -trust=base
+      -- Process
+      -trust=process
+      -trust=array
+      -trust=ghc-prim
+      -trust=deepseq
+      -- JSON
+      -trust=containers
+      -trust=mtl
+  if impl(ghc >= 9.10 && < 9.13)              
+    ghc-options:
+      -- Base
+      -- NOTE: Issue with Hackage that builds with 9.8.4. 9.10.x requies this:
+      -trust=ghc-internal
+
+library
+  import:
+      base
+  hs-source-dirs:
+      src
+  other-modules:
+      -- error: [GHC-87110]
+      -- Could not load module ‘Internal.…’.
+      -- it is a hidden module in the package ‘A-gent-0.11.0.…’
+      Internal.GaloisInc.Text.JSON
+      Internal.GaloisInc.Text.JSON.Generic
+      Internal.GaloisInc.Text.JSON.String
+      Internal.GaloisInc.Text.JSON.Types
+      --
+      Internal.GlasgowUniversity.Data.Generics.Aliases
+      --
+      Internal.RIO
+      --
+      Internal.LLM
+      Internal.LLM.Action
+      --
+      Internal.Utils
+  exposed-modules:
+      Agent.Control.Concurrent
+      Agent.Control.IFC
+      Agent.Control.MAC
+      --
+      Agent.Data.ANSI.EscapeCode
+      Agent.Data.JSON
+      --
+      Agent.IO.Effects
+      Agent.IO.Restricted
+      --
+      Agent.LLM
+      Agent.LLM.Action
+      Agent.LLM.Message
+
+-- Reference
+--
+-- - https://cabal.readthedocs.io/en/latest/cabal-package-description-file.html#pkg-field-tested-with
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,317 @@
+# Revision history for Λ-gent
+
+## 0.11.0.18 -- 2026-05-18
+
+* Added the `/drop` command to remove end-user provided `load` will help clear
+  the context sent to the LLM when using basic chat capabilities.
+  
+* Refactored the main `chat` web script due to the addition of the `/drop`
+  command. Also added the result of executing the script:
+  
+  ```sh
+  # Exit Λ-gent with /e or /exit. For more commands, type /? or /help.
+  Λ-chat> ping
+  Message {role = "assistant", content = "*PING*"}
+  Λ-chat> /drop
+  Dropping end-user data load
+  Λ-chat> If I write ping, you write pong. If I write pong, you write ping
+  Message {role = "assistant", content = "That sounds like a fun game. I'm ready."}
+  Λ-chat> pong
+  Message {role = "assistant", content = "ping"}
+  Λ-chat> pong
+  Message {role = "assistant", content = "ping"}
+  Λ-chat> ping
+  Message {role = "assistant", content = "pong"}
+  Λ-chat> pong
+  Message {role = "assistant", content = "ping"}
+  Λ-chat> /drop
+  Dropping end-user data load
+  Λ-chat> ping
+  Message {role = "assistant", content = "*PING*"}
+  Λ-chat> 
+  ```
+
+## 0.11.0.17 -- 2026-05-18
+
+* Inconsistency between `Linux` and `macOS` when it comes to default option for
+  `pwd`:
+  
+  * If no option is specified, `-P` is assumed (Linux)
+  
+  * If no options are specified, the `-L` option is assumed (macOS)
+  
+  ```
+  -L, --logical use PWD from environment, even if it contains symlinks
+  -P, --physical resolve all symlinks
+  ```
+
+* Removing exported helper functions from `Internal.RIO` that weren't used by
+  any other module.
+
+## 0.11.0.16 -- 2026-05-14
+
+* The Action and Message modules need to expose used types from the internal LLM
+  module as well.
+
+## 0.11.0.15 -- 2026-05-14
+
+* Internal LLM types MUST be exposed by LLM module.
+
+## 0.11.0.14 -- 2026-05-14
+
+* Ensured not to expose internal types. We import and re-export for type
+  signatures, but not the constructors.
+
+## 0.11.0.13 -- 2026-05-14
+
+* Updated scripts from website with changes from `0.11.0.12`.
+
+  > **NOTE:** Due to changes in this release, we need to check and update once
+  > again.
+
+* Checked scripts on `macOS` with changes from `0.11.0.12`.
+
+  > **NOTE:** As before, with changes from this release, we need to check once
+  > again.
+
+* Moved `Message` and `Action` to their own modules. For `Action`, we also add
+  an internal module to avoid exposing type constructors.
+
+* Ensured not to expose internal types. We import and re-export for type
+  signatures, but not the constructors.
+
+## 0.11.0.12 -- 2026-05-12
+
+There have been made some **major changes** to this library and therefore there
+is no backwards compatibility with previous versions:
+
+* Added support for `Code` mode, as in `read` and `write` files back and forth
+  to the `git` repository. A new tab will be added to the website with a script
+  explaining usage.
+
+* Added support for script integrity as known from `HTML`:
+
+  ```
+  <script integrity="sha256-YBbjT3uJjnS6ofC6HIal+4vNvgA9vZBfC/KMVN51URc=" …></script>
+  ```
+  
+  If the `LLM_SIGN_SHA` environment variable is provided on execution, the
+  script will check it's own file `SHA-256` hash and compare to the provided:
+  
+  ```
+  # Λ-gent integrity failed:
+  > 2d3c326e2991da5876b820fe128c3840d3c0664c43907ce725f3f3f26f2fbabc (expected)
+  > 8f89a79f891ce329a6142c68962fcad0b438e7d0b80c9410f0141cc6c02437d0 (observed)
+  ```
+
+* Adding `uuid` to main context future purposes.
+
+* Due to refactoring, the context lost a few properties (ex: `exit`, `hist`,
+  `root`, …) and some of the internals have changed. Still same output, but,
+  less chaotic. Furthermore, `rootPath` is no longer needed.
+
+* Due to refactoring, some of the exposed utils are no longer
+  relevant. Therefore, they are moved to an internal module.
+
+* Removed quotes from `curl` headers as some `LLM` API's would parse them, but
+  others would not.
+
+* Followed up on binary flags as we need to have the **least common** between
+  `Linux` distros and `macOS`.
+
+* Added the `/atom` and `/repo` commands to help parse and store files received
+  from LLM's `atomically` with help of `git worktree` as well as list the
+  produced `git branches`.
+
+* Added `message` and `action` types simplify and make more robust the
+  interactions between user and `Λ-gent`.
+
+* Wrapped `withExitCode…` functions in `try` (`Control.Exception`) to ensure the
+  `Λ-gents` don't crash and burn. Also wrapped `read` and `write` files as well
+  with `try`.
+
+## 0.11.0.11 -- 2026-04-19
+
+* Fixed a few misspells.
+
+* Refactored `Files` to `FilePaths`.
+
+* Refactored `Document(s)` to already existing `File(s)` for simplicity.
+
+* Excluding non-files (symbolic links) from search as this could bypass the
+  limitation of the current working directory.
+
+## 0.11.0.10 -- 2026-04-17
+
+* Minor bug fixes and misspells.
+
+* Moved Agent/JSON.hs to Agent/Data/JSON.hs
+
+## 0.11.0.9 -- 2026-04-16
+
+* Minor bug fixes.
+
+## 0.11.0.8 -- 2026-04-15
+
+* Refactored `/pile` to no longer storing a `find` filter but the absolute path
+  to the `find` results.
+  
+  > **NOTE:** Even though absolute path is stored, only relative will be shown.
+  
+* `/list` performance has been improved instead of performing the filters with
+  Haskell, it's now passed to the `find` command.
+  
+* Added logic to request `ISO-8601` timestamps (`UTC`) that are file path safe.
+
+* Added to website, info tab, a guide on how to setup LSP support for IDE's:
+
+  * https://a-gent.org/info.html#lsp-support-for-ides
+  
+* Due to future `git-worktree` usage, the folder `/tmp/` MUST exist in the root
+  of the project and it needs to be added to the `.gitignore` file to avoid
+  `GIT` collisions.
+  
+* Added `Internal.RIO` so the application can execute `RestrictedIO`, but,
+  consumers of the `Λ-gent` package will NOT.
+
+* All `Context` properties, except `load`, have now `internal` constructor
+  types. This will ensure that we will know that they have been instantiated by
+  the `Λ-gents`.
+  
+* From `0.11.0.6 -- 2026-03-20` below:
+  
+  > **NOTE**: Fix is not verified. Well, this update will confirm (or not).
+  
+  * Package is NO longer marked as broken: https://github.com/NixOS/nixpkgs/blob/haskell-updates/pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml
+
+* Added `withExitCodeStdIn` as `curl` has a limit on data that can be sent as a
+  parameter.
+
+* A `Agent.Data.ANSI.EscapeCode` module has been added to help distinguish
+  between input/output.
+
+* `/send` (`/s`) has been added to provide the capability of sending `/pile`
+  files as context to messages sent to LLM's.
+
+* `repl` and `replWithMode` now need to provide an optional value for the
+  projects `rootPath`. This refactoring has been added to ease logic
+  implementation for the `Λ-gent` package.
+  
+  > **NOTE**: Changes to current existing Λ-gent scripts can be done by just
+  > post-fixing `Nothing`. Example: `replWithMode Echo eval Nothing`
+
+## 0.11.0.7 -- 2026-03-30
+
+* We seem to have fixed multi-line issues. I guess we can say that we are
+  probably as good as `GHCi`.
+  
+  > **NOTE:** A thorough refactoring needs to be done to enforce `DRY`.
+
+* Added support for:
+
+  * `CTRL + L` clear screen.
+    
+  * `CTRL + U` clear text from current position to start of input.
+    
+  * `CTRL + K` clear text from current position to end of input.
+    
+  * `CTRL + A` equivalent to `HOME`.
+    
+  * `CTRL + E` equivalent to `END`.
+    
+  * `CTRL + D` equivalent to `DELETE`.
+
+## 0.11.0.6 -- 2026-03-20
+
+* Added a `todo.org` file in the root folder of the project. This will allow to
+  see current, but also future, status of the project.
+
+* Expanded file capabilities for `Code` and `Plan`.
+
+  * Files will be shown with `relative` paths. However, they will be handled
+    with `absolute` paths under the hood.
+
+* Added a few more `REPL` commands and improvements to typing.
+
+  * **NOTE**: There is a `bug` with regard of multi-line text. Hopefully it will
+    be fixed shortly.
+
+* No longer on Bluesky and therefore, removed from `cabal` file.
+
+* Issue with `haskellPackages` on `NixOS`. It seems that they use `stack` to
+  build with the latest `LTS`. The fix is to change in the `cabal` file the
+  following version contraint: `containers >= 0.7 && < 1` as `stackage` only has
+  the version `0.7` of the `containers` package.
+  
+  * **NOTE**: Fix is not verified. Well, this update will confirm (or not).
+
+* Added the `Agent.Control.Concurrent` module to provide support for
+  asynchronous tasks.
+
+* Added `Agent.Utils` modules to help for the respective `modes`. This will help
+  keep `Λ-gent` code small by providing ready to plug code bloks.
+
+## 0.11.0.5 -- 2026-03-08
+
+* `ENTER` only triggers if something is typed.
+
+## 0.11.0.4 -- 2026-03-08
+
+* Fixed the `BUG` when trying to print emojii's ('🍎', '🍏', …):
+
+  ```shell
+  <stdout>: hPutChar: invalid argument (cannot encode character '\55357'
+  ```
+  
+  by adding `setLocaleEncoding utf8` to `replWithMode`. Now instead of crashing,
+  invalid `UTF-8` characters will just be shown as single or multiple `?`.
+
+## 0.11.0.3 -- 2026-03-06
+
+* Made `read` usable by providing support for:
+
+  * `BACKSPACE` and `DELETE` to remove characters.
+  
+  * Move back and forth with `←` & `→` (single characters) and `CTRL + ←` &
+    `CTRL + →` (words).
+    
+  * Move to start and end of the text with `HOME` and `END`.
+
+## 0.11.0.2 -- 2026-03-05
+
+* Fixed issue with Hackage. The project now builds for:
+
+  * `ghc-9.4.8`
+  
+  * `ghc-9.6.7`
+  
+  * `ghc-9.8.4`
+  
+  * `ghc-9.10.3`
+  
+  * `ghc-9.12.2`
+
+## 0.11.0.1 -- 2026-03-05
+
+* Issue with Hackage. Since the service builds with `9.8.4` we have to comply
+  with that.
+
+## 0.11.0.0 -- 2026-03-04
+
+* Initial release after feedback from the NixOS Copenhagen User Group, March
+  meetup: <https://www.meetup.com/nixos-copenhagen-user-group/events/313205865/>
+
+* There is a `BUG` when trying to print emojii's ('🍎', '🍏', …):
+  ```shell
+  <stdout>: hPutChar: invalid argument (cannot encode character '\55357'
+  ```
+
+## 0 -- 2026-02-25
+
+* First version. Released on an unsuspecting world.
+
+## References
+
+* Use of a fourth component [Version scheme][haskell-stack-ver].
+
+[haskell-stack-ver]: https://docs.haskellstack.org/en/stable/maintainers/version_scheme/#use-of-a-fourth-component
diff --git a/LICENSE.md b/LICENSE.md
new file mode 100644
--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1,29 @@
+License
+=======
+
+Source code in this repository is ONLY covered by a [**Server Side Public
+License, v1 (SSPL-1.0)**][spdx-sspl-1].
+
+However, as `SSPL-1.0` is not approved by the [Free Software Foundation
+(FSF)][fsf] nor the [Open Source Initiative (OSI)][osi] as an open source
+license (yet), the package will therefore be dual-licensed under the [**GNU
+Affero General Public License v3.0 only (AGPL-3.0-only)**][spdx-agpl-3o] as well
+so the [Hackage][hackage-osl] operators don't have any conflict with their
+ability to operate the service.
+
+Local versions of each of the licenses can be seen at:
+
+* [**Server Side Public License, v1 (SSPL-1.0)**][local-sspl-1]
+
+* [**GNU Affero General Public License v3.0 only
+(AGPL-3.0-only)**][local-agpl-3o]
+
+[spdx-sspl-1]:  https://spdx.org/licenses/SSPL-1.0
+[spdx-agpl-3o]: https://spdx.org/licenses/AGPL-3.0-only
+[hackage-osl]:  https://hackage.haskell.org/upload
+
+[fsf]: https://www.fsf.org/
+[osi]: https://opensource.org/
+
+[local-sspl-1]:  ./LICENSE_SSPL-1.0.txt
+[local-agpl-3o]: ./LICENSE_AGPL-3.0-only.txt
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,108 @@
+Λ-gent
+======
+
+[![Hackage](https://img.shields.io/hackage/v/A-gent.svg)](https://hackage.haskell.org/package/A-gent)
+
+`Λ-gent`, pronounced «_**a gent**_», where the **capital lambda** (`Λ`) is a
+replacement of the letter `A` in **agent** due to their similarities and [lambda
+calculus][lambda-calculus-wiki] being the backbone of [Haskell][haskell] and
+`nix` {[language][nix-lang] | [package manager][nix-pkg-man] |
+[command][nix-cmd]} / [NixOS][nix-nixOS].
+
+With the substitution, we are now left with the word [gent][oxford-gent], the
+abbreviation of [gentleman][oxford-gentleman], which will help us define our
+[LLM][llm-wiki] **agent** as:
+
+> _«Polite, well **educated**, has excellent manners and **always** behaves
+> well»_
+
+[haskell]:              https://www.haskell.org/
+[nix-lang]:             https://wiki.nixos.org/wiki/Nix_(language)
+[nix-pkg-man]:          https://wiki.nixos.org/wiki/Nix_(package_manager)
+[nix-cmd]:              https://wiki.nixos.org/wiki/Nix_(command)
+[nix-nixOS]:            https://wiki.nixos.org/wiki/NixOS
+[lambda-calculus-wiki]: https://en.wikipedia.org/wiki/Lambda_calculus
+[oxford-gent]:          https://www.oxfordlearnersdictionaries.com/definition/english/gent
+[oxford-gentleman]:     https://www.oxfordlearnersdictionaries.com/definition/english/gentleman
+[llm-wiki]:             https://en.wikipedia.org/wiki/Large_language_model
+
+Project structure
+=================
+
+```sh
+├── doc
+│   └── TODO.md
+├── src
+│   ├── Agent
+│   │   ├── Control
+│   │   │   ├── Concurrent.hs
+│   │   │   ├── IFC.hs
+│   │   │   └── MAC.hs
+│   │   ├── Data
+│   │   │   ├── ANSI
+│   │   │   │   └── EscapeCode.hs
+│   │   │   └── JSON.hs
+│   │   ├── IO
+│   │   │   ├── Effects.hs
+│   │   │   └── Restricted.hs
+│   │   └── LLM.hs
+│   └── Internal
+│       ├── GaloisInc
+│       │   └── Text
+│       │       ├── JSON
+│       │       │   ├── Generic.hs
+│       │       │   ├── String.hs
+│       │       │   └── Types.hs
+│       │       ├── JSON.hs
+│       │       ├── LICENSE
+│       │       └── NOTES.md
+│       ├── GlasgowUniversity
+│       │   ├── Data
+│       │   │   └── Generics
+│       │   │       └── Aliases.hs
+│       │   ├── LICENSE
+│       │   └── NOTES.md
+│       ├── LLM.hs
+│       ├── RIO.hs
+│       └── Utils.hs
+├── uat
+│   └── TODO.md
+├── A-gent.cabal
+├── CHANGELOG.md
+├── LICENSE.md
+├── LICENSE_AGPL-3.0-only.txt
+├── LICENSE_SSPL-1.0.txt
+├── README.md
+├── Setup.hs
+└── todo.org
+```
+
+License
+=======
+
+Source code in this repository is ONLY covered by a [**Server Side Public
+License, v1 (SSPL-1.0)**][spdx-sspl-1].
+
+However, as `SSPL-1.0` is not approved by the [Free Software Foundation
+(FSF)][fsf] nor the [Open Source Initiative (OSI)][osi] as an open source
+license (yet), the package will therefore be dual-licensed under the [**GNU
+Affero General Public License v3.0 only (AGPL-3.0-only)**][spdx-agpl-3o] as well
+so the [Hackage][hackage-osl] operators don't have any conflict with their
+ability to operate the service.
+
+Local versions of each of the licenses can be seen at:
+
+* [**Server Side Public License, v1 (SSPL-1.0)**][local-sspl-1]
+
+* [**GNU Affero General Public License v3.0 only
+(AGPL-3.0-only)**][local-agpl-3o]
+
+[spdx-sspl-1]:  https://spdx.org/licenses/SSPL-1.0
+[spdx-agpl-3o]: https://spdx.org/licenses/AGPL-3.0-only
+[hackage-osl]:  https://hackage.haskell.org/upload
+
+[fsf]: https://www.fsf.org/
+[osi]: https://opensource.org/
+
+[local-sspl-1]:  ./LICENSE_SSPL-1.0.txt
+[local-agpl-3o]: ./LICENSE_AGPL-3.0-only.txt
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,20 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+
+--------------------------------------------------------------------------------
+
+import           Distribution.Simple
+  ( defaultMain
+  )
+
+--------------------------------------------------------------------------------
+
+main :: IO ()
+main = defaultMain
diff --git a/src/Agent/Control/Concurrent.hs b/src/Agent/Control/Concurrent.hs
new file mode 100644
--- /dev/null
+++ b/src/Agent/Control/Concurrent.hs
@@ -0,0 +1,85 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+{-# LANGUAGE LambdaCase                   #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+
+--------------------------------------------------------------------------------
+
+module Agent.Control.Concurrent
+  ( Async
+  , Task
+  , fork
+  , wait
+  , join
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import           Control.Concurrent      ( ThreadId, forkFinally )
+import           Control.Concurrent.MVar
+  ( MVar
+  , newEmptyMVar
+  , putMVar
+  , readMVar
+  )
+import           GHC.Exception           ( SomeException, throw )
+
+--------------------------------------------------------------------------------
+
+data Task a = Task !ThreadId (IO (Either SomeException a))
+
+--------------------------------------------------------------------------------
+
+-- |
+-- To prevent the users from adding instances of `Async`, we
+-- provide a middle-layer (`Proxy`) between the `Monad` instance and the `Proxy`
+-- (`Async`) instance.
+
+class Monad m => Proxy m where
+  new :: m (MVar a)
+  put ::    MVar a -> a -> m ( )
+  get ::    MVar a ->      m  a
+class Proxy m => Async m where
+  fork ::   m    a   -> m (Task a)
+  wait ::   Task a   -> m       a
+  join :: [ Task a ] -> m      ( )
+
+--------------------------------------------------------------------------------
+
+instance Proxy IO where
+  -- | newEmptyMVar: Create an MVar which is initially empty.
+  new = newEmptyMVar
+  -- | putMVar: Put a value into an MVar.
+  put = putMVar
+  -- |
+  -- readMVar: Atomically read the contents of an MVar. If the MVar is currently
+  -- empty, readMVar will wait until it is full. readMVar is guaranteed to
+  -- receive the next putMVar.
+  get = readMVar
+
+instance Async IO where
+  fork compute =
+    new                               >>= \ var ->
+    forkFinally compute (finally var) >>= \ tid ->
+    pure $ Task tid $ get var
+    where
+      finally v r = put v r
+  wait (Task _ mvar) =
+    ( \case
+        Right v ->       v
+        Left  e -> throw e
+    )
+    <$> mvar
+  join =
+    mapM_ wait
diff --git a/src/Agent/Control/IFC.hs b/src/Agent/Control/IFC.hs
new file mode 100644
--- /dev/null
+++ b/src/Agent/Control/IFC.hs
@@ -0,0 +1,81 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+{-# LANGUAGE MultiParamTypeClasses        #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+--
+-- Information Flow Control (IFC)
+--
+-- https://en.wikipedia.org/wiki/Information_flow_(information_theory)
+--
+-- In low level information flow analysis, each variable is usually assigned a
+-- security level. The basic model comprises two distinct levels: low and high,
+-- meaning, respectively, publicly observable information, and secret
+-- information. To ensure confidentiality, flowing information from high to low
+-- variables should not be allowed. On the other hand, to ensure integrity,
+-- flows to high variables should be restricted.[1]
+--
+-- More generally, the security levels can be viewed as a lattice with
+-- information flowing only upwards in the lattice.[2]
+--
+-- For example, considering two security levels `L` and `H` (low and high), if
+-- `L ≤ H`, flows from `L` to `L`, from `H` to `H`, and `L` to `H` would be
+-- allowed, while flows from `H` to `L` would not.[3]
+--
+-- Throughout this article, the following notation is used:
+--
+-- a) variable `l ∈ L` (low) shall denote a publicly observable variable
+--
+-- b) variable `h ∈ H` (high) shall denote a secret variable
+--
+-- Where `L` and `H` are the only two security levels in the lattice being
+-- considered.
+--
+-- [1] Andrei Sabelfeld and Andrew C. Myers. Language-Based Information-Flow
+-- Security. IEEE Journal on Selected Areas in Communications, 21(1), Jan. 2003.
+--
+-- [2] Dorothy Denning. A lattice model of secure information
+-- flow. Communications of the ACM, 19(5):236-242, 1976.
+--
+-- [3] Smith, Geoffrey (2007). "Principles of Secure Information Flow
+-- Analysis". Advances in Information Security. 27. Springer US. pp. 291–307.
+
+--------------------------------------------------------------------------------
+
+module Agent.Control.IFC
+  ( Flow
+    -- * Observable variables
+  , L
+  , H
+  )
+where
+
+--------------------------------------------------------------------------------
+
+data L -- (low) denote a publicly observable variable
+data H -- (high) denote a secret non-observable variable
+
+--------------------------------------------------------------------------------
+
+class Lattice a b
+
+instance Lattice L L
+instance Lattice L H
+instance Lattice H H
+
+--------------------------------------------------------------------------------
+
+class Lattice a b => Flow a b
+
+instance Flow L L
+instance Flow L H
+instance Flow H H
diff --git a/src/Agent/Control/MAC.hs b/src/Agent/Control/MAC.hs
new file mode 100644
--- /dev/null
+++ b/src/Agent/Control/MAC.hs
@@ -0,0 +1,147 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+--
+-- Mandatory Access Control (MAC)
+--
+-- https://en.wikipedia.org/wiki/Mandatory_access_control
+--
+-- In computer security, mandatory access control (MAC) refers to a type of
+-- access control by which the operating system or database constrains the
+-- ability of a subject or initiator to access or generally perform some sort of
+-- operation on an object or target.[1] In the case of operating systems, a
+-- subject is usually a process or thread; objects are constructs such as files,
+-- directories, TCP/UDP ports, shared memory segments, IO devices, etc. Subjects
+-- and objects each have a set of security attributes. Whenever a subject
+-- attempts to access an object, an authorization rule enforced by the operating
+-- system kernel examines these security attributes and decides whether the
+-- access can take place. Any operation by any subject on any object is tested
+-- against the set of authorization rules (aka policy) to determine if the
+-- operation is allowed. A database management system, in its access control
+-- mechanism, can also apply mandatory access control; in this case, the objects
+-- are tables, views, procedures, etc.
+--
+-- With mandatory access control, this security policy is centrally controlled
+-- by a security policy administrator; users do not have the ability to override
+-- the policy and, for example, grant access to files that would otherwise be
+-- restricted. By contrast, discretionary access control (DAC), which also
+-- governs the ability of subjects to access objects, allows users the ability
+-- to make policy decisions and/or assign security attributes. (The traditional
+-- Unix system of users, groups, and read-write-execute permissions is an
+-- example of DAC.) MAC-enabled systems allow policy administrators to implement
+-- organization-wide security policies. Under MAC (and unlike DAC), users cannot
+-- override or modify this policy, either accidentally or intentionally. This
+-- allows security administrators to define a central policy that is guaranteed
+-- (in principle) to be enforced for all users.
+--
+-- [1] Belim, S. V.; Belim, S. Yu. (December 2018). "Implementation of Mandatory
+-- Access Control in Distributed Systems". Automatic Control and Computer
+-- Sciences. 52 (8): 1124–1126. doi:10.3103/S0146411618080357. ISSN 0146-4116.
+
+--------------------------------------------------------------------------------
+
+module Agent.Control.MAC
+  ( MAC (MAC, run)
+  , UID (UID, uid)
+  , RES (RES, res)
+  , join
+  , label
+  , unlabel
+  , value
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import           Control.Monad     ( ap, liftM )
+
+import           Control.Exception ( Exception, SomeException )
+import qualified Control.Exception as Ex
+
+import           Agent.Control.IFC ( Flow )
+
+--------------------------------------------------------------------------------
+
+newtype MAC p a = MAC { run :: IO a }
+
+instance Monad (MAC p) where
+  (>>=) m f = MAC $ run m >>= run . f
+
+instance Applicative (MAC p) where
+  pure  = MAC . pure
+  (<*>) = ap
+
+instance Functor (MAC p) where
+  fmap = liftM
+
+--------------------------------------------------------------------------------
+
+-- UID: Unique identifier
+-- RES: Resource
+-- LAB: Label
+
+newtype UID   a = UID   { uid :: a }
+newtype RES p a = RES   { res :: a }
+type    LAB p a = RES p ( UID    a )
+
+--------------------------------------------------------------------------------
+
+value
+  :: LAB l a
+  -> a
+value =
+  uid . res
+
+label
+  :: Flow l h
+  => a
+  -> MAC l (LAB h a)
+label =
+  aux . pure . UID
+  where
+    aux io = RES <$> MAC io
+
+unlabel
+  :: Flow l h
+  => LAB l a
+  -> MAC h a
+unlabel =
+  aux $ pure . uid
+  where
+    aux io = MAC . io . res
+
+join
+  :: Flow l h
+  => MAC h        a
+  -> MAC l (LAB h a)
+join m =
+  (MAC . run) (aux m) >>= label
+  where
+    aux x = catch x throw
+
+--------------------------------------------------------------------------------
+
+-- HELPERS
+
+throw
+  :: SomeException
+  -> MAC l a
+throw =
+  MAC . Ex.throw
+
+catch
+  :: Exception e
+  =>       MAC l a
+  -> (e -> MAC l a)
+  ->       MAC l a
+catch (MAC io) f =
+  MAC $ Ex.catch io $ run . f
diff --git a/src/Agent/Data/ANSI/EscapeCode.hs b/src/Agent/Data/ANSI/EscapeCode.hs
new file mode 100644
--- /dev/null
+++ b/src/Agent/Data/ANSI/EscapeCode.hs
@@ -0,0 +1,224 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+
+--------------------------------------------------------------------------------
+
+module Agent.Data.ANSI.EscapeCode
+  ( -- * Type signatures
+    SelectGraphicRendition
+  , Blink
+  , Bright
+  , Background
+  , Foreground
+    -- * Enums
+  , Colour
+    ( Black
+    , Red
+    , Green
+    , Yellow
+    , Blue
+    , Magenta
+    , Cyan
+    , White
+    )
+  , Frequency
+    ( Slow
+    , Fast
+    )
+    -- * Methods
+  , sgr
+  , foreground
+  , background
+  , bold
+  , faint
+  , italic
+  , underline
+  , blink
+  )
+where
+
+--------------------------------------------------------------------------------
+
+data Colour
+  = Black
+  | Red
+  | Green
+  | Yellow
+  | Blue
+  | Magenta
+  | Cyan
+  | White
+  deriving (Eq)
+
+instance Enum Colour where
+  fromEnum Black   = 0
+  fromEnum Red     = 1
+  fromEnum Green   = 2
+  fromEnum Yellow  = 3
+  fromEnum Blue    = 4
+  fromEnum Magenta = 5
+  fromEnum Cyan    = 6
+  fromEnum White   = 7
+
+  toEnum 0 = Black
+  toEnum 1 = Red
+  toEnum 2 = Green
+  toEnum 3 = Yellow
+  toEnum 4 = Blue
+  toEnum 5 = Magenta
+  toEnum 6 = Cyan
+  toEnum 7 = White
+  toEnum _ = error "Colour code not supported"
+
+type Bright = Bool
+
+data Background = BG !Bool Bright Colour
+data Foreground = FG !Bool Bright Colour
+
+data Frequency
+  = Slow
+  | Fast
+
+data Blink = B !Bool Frequency
+
+data SelectGraphicRendition
+  = SGR !Background !Foreground !Bool !Bool !Bool !Bool !Blink String
+
+instance Show SelectGraphicRendition where
+  show (SGR bg fg bo fa it un bl text) =
+    "\ESC[" ++
+    "0"     ++
+    (cb bg) ++
+    (cf fg) ++
+    (fb bo) ++
+    (ff fa) ++
+    (fi it) ++
+    (fu un) ++
+    (bf bl) ++
+    "m"     ++
+    text    ++
+    "\ESC[00m"
+    where
+      cb (BG True  True  c) = ";" ++ (show $ 60 + 40 + fromEnum c)
+      cb (BG True  False c) = ";" ++ (show $      40 + fromEnum c)
+      cb (BG False _____ _) = [                                  ]
+      cf (FG True  True  c) = ";" ++ (show $ 60 + 30 + fromEnum c)
+      cf (FG True  False c) = ";" ++ (show $      30 + fromEnum c)
+      cf (FG False _____ _) = [                                  ]
+      fb     True  = ";01"
+      fb     False = [   ]
+      ff     True  = ";02"
+      ff     False = [   ]
+      fi     True  = ";03"
+      fi     False = [   ]
+      fu     True  = ";04"
+      fu     False = [   ]
+      bf (B  True  Slow) = ";05"
+      bf (B  True  Fast) = ";06"
+      bf (B  False ____) = [   ]
+
+--------------------------------------------------------------------------------
+
+sgr
+  :: String
+  -> SelectGraphicRendition
+
+foreground
+  :: Bright
+  -> Colour
+  -> SelectGraphicRendition
+  -> SelectGraphicRendition
+
+background
+  :: Bright
+  -> Colour
+  -> SelectGraphicRendition
+  -> SelectGraphicRendition
+
+bold
+  :: SelectGraphicRendition
+  -> SelectGraphicRendition
+
+faint
+  :: SelectGraphicRendition
+  -> SelectGraphicRendition
+
+italic
+  :: SelectGraphicRendition
+  -> SelectGraphicRendition
+
+underline
+  :: SelectGraphicRendition
+  -> SelectGraphicRendition
+
+blink
+  :: Frequency
+  -> SelectGraphicRendition
+  -> SelectGraphicRendition
+
+--------------------------------------------------------------------------------
+
+sgr =
+  SGR bg fg bo fa it un bl
+  where
+    fg = FG False undefined undefined
+    bg = BG False undefined undefined
+    bo = False
+    fa = False
+    it = False
+    un = False
+    bl = B False undefined
+
+--------------------------------------------------------------------------------
+
+foreground b c (SGR bg __ bo fa it un bl txt) =
+  SGR bg fg bo fa it un bl txt
+  where
+    fg = FG True b c
+
+background b c (SGR __ fg bo fa it un bl txt) =
+  SGR bg fg bo fa it un bl txt
+  where
+    bg = BG True b c
+
+bold (SGR bg fg __ fa it un bl txt) =
+  SGR bg fg bo fa it un bl txt
+  where
+    bo = True
+
+faint (SGR bg fg bo __ it un bl txt) =
+  SGR bg fg bo fa it un bl txt
+  where
+    fa = True
+
+italic (SGR bg fg bo fa __ un bl txt) =
+  SGR bg fg bo fa it un bl txt
+  where
+    it = True
+
+underline (SGR bg fg bo fa it __ bl txt) =
+  SGR bg fg bo fa it un bl txt
+  where
+    un = True
+
+blink f (SGR bg fg bo fa it un __ txt) =
+  SGR bg fg bo fa it un bl txt
+  where
+    bl = B True f
+
+--------------------------------------------------------------------------------
+
+-- References
+--
+-- ANSI escape code:
+-- * https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_parameters
diff --git a/src/Agent/Data/JSON.hs b/src/Agent/Data/JSON.hs
new file mode 100644
--- /dev/null
+++ b/src/Agent/Data/JSON.hs
@@ -0,0 +1,64 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+
+--------------------------------------------------------------------------------
+
+module Agent.Data.JSON
+  ( -- * Infer JSON from Data
+    Data
+    -- * JSON Encoder/Decoder
+  , DecodeError(InvalidJSON, DiffSchema)
+  , encode
+  , decode
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import           Data.Data                            ( Data )
+
+import           Internal.GaloisInc.Text.JSON.Generic
+  ( Result (Error, Ok)
+  , encodeJSON
+  , fromJSON
+  )
+import           Internal.GaloisInc.Text.JSON.String
+  ( readJSValue
+  , runGetJSON
+  )
+
+--------------------------------------------------------------------------------
+
+data DecodeError
+  = InvalidJSON
+  | DiffSchema
+
+--------------------------------------------------------------------------------
+
+encode
+  :: Data a
+  => a
+  -> String
+encode = encodeJSON
+
+decode
+  :: Data a
+  => String
+  -> Either DecodeError a
+decode json =
+  case runGetJSON readJSValue json of
+    Left  _ -> Left InvalidJSON
+    Right v ->
+      case fromJSON v of
+        Error _ -> Left  DiffSchema
+        Ok    a -> Right a
diff --git a/src/Agent/IO/Effects.hs b/src/Agent/IO/Effects.hs
new file mode 100644
--- /dev/null
+++ b/src/Agent/IO/Effects.hs
@@ -0,0 +1,216 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+
+--------------------------------------------------------------------------------
+
+module Agent.IO.Effects
+  ( -- * LLM (Config)
+    LlmConf(llmPathCWD)
+    -- * LLM (Chat)
+  , LlmChatConf(llmChatKey, llmChatAPI)
+  , LlmChatPost(llmChatWeb)
+  , -- * LLM (Code)
+    LlmCodeRoot(llmCodeDir)
+  , LlmCodeMask(llmCodeMsk)
+  , LlmCodeTmpl(llmCodeIns, llmCodeExa)
+  , LlmCodeRead(llmCodeSeq, llmCodeGet, llmCodeGit)
+  , LlmCodeSave(llmCodePut)
+  , LlmCodeConf(llmCodeKey, llmCodeAPI)
+  , LlmCodePost(llmCodeWeb)
+  , -- * LLM (Plan)
+    LlmPlanRoot(llmPlanDir)
+  , LlmPlanMask(llmPlanMsk)
+  , LlmPlanRead(llmPlanSeq, llmPlanGet)
+  , LlmPlanConf(llmPlanKey, llmPlanAPI)
+  , LlmPlanPost(llmPlanWeb)
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import qualified Internal.LLM as LLM
+
+--------------------------------------------------------------------------------
+
+class
+  Monad m
+  => LlmConf m
+  where
+    llmPathCWD
+      :: m (Maybe LLM.Root)
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+class
+  Monad m
+  => LlmChatConf m
+  where
+    llmChatAPI
+      :: m (Maybe String)
+    llmChatKey
+      :: m (Maybe String)
+
+--------------------------------------------------------------------------------
+
+class
+  LlmChatConf m
+  => LlmChatPost m
+  where
+    llmChatWeb
+      :: String
+      -> m (Either String String)
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+class
+  Monad m
+  => LlmCodeRoot m
+  where
+    llmCodeDir
+      :: m String -- Ex: "src"
+
+--------------------------------------------------------------------------------
+
+class
+  Monad m
+  => LlmCodeMask m
+  where
+    llmCodeMsk
+      :: m [ String ] -- Ex: [ "*.hs", "*.lhs" ]
+
+--------------------------------------------------------------------------------
+
+class
+  Monad m
+  => LlmCodeTmpl m
+  where
+    llmCodeIns
+      :: m [LLM.File]
+    llmCodeExa
+      :: m [LLM.File]
+
+--------------------------------------------------------------------------------
+
+class
+  ( LlmConf m
+  , LlmCodeRoot m
+  , LlmCodeMask m
+  )
+  => LlmCodeRead m
+  where
+    llmCodeSeq
+      :: Maybe LLM.Filter
+      -> m (Either [String] LLM.FilePaths)
+    llmCodeGet
+      :: LLM.AbsoluteFilePath
+      -> m (Either String LLM.File)
+    llmCodeGit
+      :: m (Either String String)
+
+--------------------------------------------------------------------------------
+
+class
+  ( LlmConf m
+  , LlmCodeRoot m
+  )
+  => LlmCodeSave m
+  where
+    llmCodePut
+      :: String
+      -> LLM.Files
+      -> m (Either String String)
+
+--------------------------------------------------------------------------------
+
+class
+  Monad m
+  => LlmCodeConf m
+  where
+    llmCodeAPI
+      :: m (Maybe String)
+    llmCodeKey
+      :: m (Maybe String)
+
+--------------------------------------------------------------------------------
+
+class
+  LlmCodeConf m
+  => LlmCodePost m
+  where
+    llmCodeWeb
+      :: String
+      -> m (Either String String)
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+class
+  Monad m
+  => LlmPlanRoot m
+  where
+    llmPlanDir
+      :: m String -- Ex: "llm"
+
+--------------------------------------------------------------------------------
+
+class
+  Monad m
+  => LlmPlanMask m
+  where
+    llmPlanMsk
+      :: m [ String ] -- Ex: [ "plan_*.md" ]
+
+--------------------------------------------------------------------------------
+
+class
+  ( LlmConf m
+  , LlmPlanRoot m
+  , LlmPlanMask m
+  , LlmCodeRead m
+  )
+  => LlmPlanRead m
+  where
+    llmPlanSeq
+      :: Maybe LLM.Filter
+      -> m (Either [String] LLM.FilePaths)
+    llmPlanGet
+      :: String
+      -> m (Either String LLM.File)
+
+--------------------------------------------------------------------------------
+
+class
+  Monad m
+  => LlmPlanConf m
+  where
+    llmPlanAPI
+      :: m (Maybe String)
+    llmPlanKey
+      :: m (Maybe String)
+
+--------------------------------------------------------------------------------
+
+class
+  ( LlmConf m
+  , LlmPlanConf m
+  )
+  => LlmPlanPost m
+  where
+    llmPlanWeb
+      :: String
+      -> m (Either String String)
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
diff --git a/src/Agent/IO/Restricted.hs b/src/Agent/IO/Restricted.hs
new file mode 100644
--- /dev/null
+++ b/src/Agent/IO/Restricted.hs
@@ -0,0 +1,95 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+--
+-- Safe {H}askell
+--
+-- https://simonmar.github.io/bib/safe-haskell-2012_abstract.html
+--
+-- (David Terei, David Mazières, Simon Marlow, Simon Peyton Jones) Haskell ’12:
+-- Proceedings of the Fifth ACM SIGPLAN Symposium on Haskell, Copenhagen,
+-- Denmark, ACM, 2012
+--
+-- Though Haskell is predominantly type-safe, implementations contain a few
+-- loopholes through which code can bypass typing and module encapsulation. This
+-- paper presents Safe Haskell, a language extension that closes these
+-- loopholes. Safe Haskell makes it possible to confine and safely execute
+-- untrusted, possibly malicious code. By strictly enforcing types, Safe Haskell
+-- allows a variety of different policies from API sandboxing to
+-- information-flow control to be implemented easily as monads. Safe Haskell is
+-- aimed to be as unobtrusive as possible. It enforces properties that
+-- programmers tend to meet already by convention. We describe the design of
+-- Safe Haskell and an implementation (currently shipping with GHC) that infers
+-- safety for code that lies in a safe subset of the language. We use Safe
+-- Haskell to implement an online Haskell interpreter that can securely execute
+-- arbitrary untrusted code with no overhead. The use of Safe Haskell greatly
+-- simplifies this task and allows the use of a large body of existing code and
+-- tools.
+
+--------------------------------------------------------------------------------
+
+module Agent.IO.Restricted
+  ( RIO
+    -- * Environment
+  , getEnvVar
+    -- * LLM (Config)
+  , llmPathCWD
+    -- * LLM (Chat)
+  , llmChatKey, llmChatAPI
+  , llmChatWeb
+    -- * LLM (Code)
+  , llmCodeDir
+  , llmCodeMsk
+  , llmCodeIns, llmCodeExa
+  , llmCodeSeq, llmCodeGet, llmCodeGit
+  , llmCodePut
+  , llmCodeKey, llmCodeAPI
+  , llmCodeWeb
+    -- * LLM (Plan)
+  , llmPlanDir
+  , llmPlanMsk
+  , llmPlanSeq, llmPlanGet
+  , llmPlanKey, llmPlanAPI
+  , llmPlanWeb
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import           Internal.RIO ( RIO )
+
+import           Internal.RIO ( getEnvVar )
+
+import           Internal.RIO
+  ( llmChatAPI
+  , llmChatKey
+  , llmChatWeb
+  , llmCodeAPI
+  , llmCodeDir
+  , llmCodeExa
+  , llmCodeGet
+  , llmCodeGit
+  , llmCodeIns
+  , llmCodeKey
+  , llmCodeMsk
+  , llmCodePut
+  , llmCodeSeq
+  , llmCodeWeb
+  , llmPathCWD
+  , llmPlanAPI
+  , llmPlanDir
+  , llmPlanGet
+  , llmPlanKey
+  , llmPlanMsk
+  , llmPlanSeq
+  , llmPlanWeb
+  )
diff --git a/src/Agent/LLM.hs b/src/Agent/LLM.hs
new file mode 100644
--- /dev/null
+++ b/src/Agent/LLM.hs
@@ -0,0 +1,770 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+{-# LANGUAGE RankNTypes                   #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+--
+-- Polite and well educated LLM agent with excellent manners that always behaves
+-- well.
+
+--------------------------------------------------------------------------------
+
+module Agent.LLM
+  ( -- * Modes
+    Mode(..)
+    -- * Context
+  , Context(..)
+  , AbsoluteFilePath
+  , Chat
+  , Chit
+  , File
+  , FileLine
+  , FilePaths
+  , Files
+  , Filter
+  , History
+  , Load
+  , Mask
+  , Root
+  , Template
+  , UUID
+    -- * Paramenters
+  , Eval
+    -- * Methods
+  , repl
+  , replWithMode
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import           Prelude                    hiding ( head, mod, print, read )
+
+
+import           Data.Char                  ( toLower, toUpper )
+import           Data.Maybe                 ( fromMaybe )
+import           GHC.IO.Encoding            ( setLocaleEncoding )
+import           System.Environment         ( getProgName )
+import qualified System.Environment.Blank   as ENV
+import           System.Exit
+  ( ExitCode (ExitFailure, ExitSuccess)
+  )
+import           System.IO
+  ( BufferMode (LineBuffering, NoBuffering)
+  , hFlush
+  , hSetBuffering
+  , hSetEcho
+  , stderr
+  , stdin
+  , stdout
+  , utf8
+  )
+import           System.Process             ( readProcessWithExitCode )
+import           Text.Read                  ( readMaybe )
+
+import           Internal.LLM
+  ( AbsoluteFilePath
+  , Chat
+  , Chit (..)
+  , File
+  , FileLine
+  , FilePaths
+  , Files
+  , Filter
+  , History (..)
+  , Mask
+  , Mode (..)
+  , Root
+  , Template
+  , UUID
+  , modes
+  )
+import qualified Internal.LLM               as INT
+import           Internal.LLM.Action        ( Action (..) )
+import           Internal.RIO               ( RIO (..), input, output )
+import qualified Internal.Utils             as UTL
+
+import qualified Agent.Data.ANSI.EscapeCode as AEC
+import qualified Agent.LLM.Message          as MSG
+
+import           Agent.Data.JSON            ( Data )
+import           Agent.LLM.Message          ( Message )
+
+
+--------------------------------------------------------------------------------
+
+type Load a =
+  ( Data a
+  , Show a
+  )
+  => Maybe a
+
+data Context a =
+  Context
+    { uuid :: !UUID
+    , mode :: !Mode
+    , load :: !(Load a)
+    , hist :: !History
+    , list :: !(Maybe Filter)
+    , pile :: !(Maybe FilePaths)
+    , ruck :: !(Maybe Files)
+    }
+
+type Eval a =
+  Context a
+  -> Message
+  -> RIO (Context a, Action)
+
+--------------------------------------------------------------------------------
+
+repl
+  :: Eval a
+  -> IO ()
+repl =
+  replWithMode INT.Chat
+
+replWithMode
+  :: INT.Mode
+  -> Eval a
+  -> IO ()
+replWithMode mod proc =
+  do
+    constraint <- integrity
+    case constraint of
+      Right __ ->
+        do
+          setLocaleEncoding utf8
+          hSetBuffering stderr NoBuffering
+          hSetBuffering stdin  NoBuffering
+          -- NOTE: logic based on `hFlush stdout`
+          hSetBuffering stdout LineBuffering
+          -- NOTE: No default output when typing
+          hSetEcho      stdin  False
+          putStrLn head >> hFlush stdout
+          run $ loop ctx proc
+      Left err ->
+        putStrLn err >> hFlush stdout
+  where
+    ctx =
+      Context
+        { uuid = INT.UUID []
+        , mode = mod
+        , load = Nothing
+        , hist =
+          History
+            { chit =
+                Chit
+                  { prev = []
+                  , next = []
+                  }
+            , chat = []
+            }
+        , list = Nothing
+        , pile = Just $ INT.FilePaths []
+        , ruck = Just $ INT.Files []
+        }
+
+--------------------------------------------------------------------------------
+
+-- HELPERS (private)
+
+{- NOTE: Doesn't seem to work
+ctrlC :: IO () -> IO ()
+ctrlC task =
+  -- NOTE: Catch CTRL+C
+  -- https://neilmitchell.blogspot.com/2015/05/handling-control-c-in-haskell.html
+  sync . (:[]) <$> fork task
+-}
+
+head :: String
+head =
+  "# Exit Λ-gent with /e or /exit. For more commands, type /? or /help."
+
+help :: String
+help =
+  unlines
+    [ "# Supported commands:"
+    , ds
+    , "/?   or /help   | This message"
+    , "/e   or /exit   | Exit Λ-gent"
+    , "/w   or /wipe   | Wipe screen"
+    , "/d   or /drop   | Drop end-user data load"
+    , ds
+    , "/m m or /mode m | Change to {" ++ ms ++ "}. Ex: /m plan"
+    , ds
+    , "/h   or /hist   | View history (input and output)"
+    , "        /chit   | View history (only input) "
+    , "        /chat   | View history (only output)"
+    , ds
+    , "/l f or /list f | List of files, limited by mode, file masks and filter"
+    , "/p   or /pile   | Show stored list of files. See /list above"
+    , "/f i or /file i | Show file with the given index. See /pile above"
+    , "/n i or /nums i | Show file with line numbers. See /file above"
+    , ds
+    , "/s m or /send m | Sending /pile to LLM as context to the message"
+    , "/r o or /ruck o | View files (opt index) from LLM response. See /send"
+    , "/a d or /atom d | Atomically save /ruck files to a GIT branch (+ description)"
+    , "        /repo   | List GIT branches (+ description). See /atom above"
+    , ds
+    ]
+  where
+    ds = replicate 80 '-'
+    ms =
+      foldl1 (\ x y -> x ++ "|" ++ y) $ map (map toLower . show) modes
+
+loop
+  :: Context a
+  -> Eval a
+  -> RIO ()
+loop ctx eval =
+  print prompt >>
+  read hps hns >>= \ txt ->
+  printLn [ ]  >>
+  case txt2act txt of
+    -- TODO: Refactoring needed
+
+    -- Nested -- Start
+    None                      ->
+      loop (nxt txt ctx Nothing) eval
+    File _                    ->
+      loop (nxt txt ctx Nothing) eval
+    Template _ _ _ _         ->
+      loop (nxt txt ctx Nothing) eval
+    -- Nested -- Stop
+
+    Exit                      -> caseExit
+    Help                      -> caseHelp       txt
+    Drop                      -> caseDrop       txt
+    Hist (chits, chats)       -> caseHist       txt chits chats
+    Mode c cs                 -> caseMode       txt c cs
+    Paths (INT.FilePaths fps) -> casePaths      txt fps
+    Pile                      -> casePile       txt
+    Ruck mdix                 -> caseRuck       txt mdix
+    Wipe                      -> caseWipe       txt
+    UnknownCmd cmd            -> caseUnknownCmd txt cmd
+
+    Branch msg fs             ->
+      eval ctx (MSG.Atom msg fs) >>= \ (upd, action) ->
+      case action of
+        Message (MSG.Text cs)         ->
+          printLn cs >>
+          loop (nxt txt upd (Just cs)) eval
+        None                      ->
+          loop (nxt txt upd Nothing) eval
+        _________________________ ->
+          -- NOTE: Unexpected error
+          printLn "Unexpected error" >>
+          loop (nxt txt upd (Just [])) eval
+
+    Prompt msg                ->
+
+      eval ctx (MSG.Tmpl afps) >>= \ (upd0, action0) ->
+      case action0 of
+        Template f is es fs ->
+
+          eval ctx (MSG.Send xml) >>= \ (upd1, action1) ->
+          case action1 of
+            Message (MSG.Text cs)         ->
+              printLn cs >>
+              loop
+                ( nxt txt
+                    ( upd1 { ruck = Just $ pfs }
+                    )
+                    ( Just cs
+                    )
+                ) eval
+              where
+                pfs =
+                  case (map INT.File . f) cs of
+                    [] -> INT.Files []
+                    xs -> INT.Files xs
+            None                      ->
+              loop (nxt txt upd1 Nothing) eval
+            _________________________ ->
+              -- NOTE: Unexpected error
+              printLn "Unexpected error" >>
+              loop (nxt txt upd1 (Just [])) eval
+          where
+            ils = map ( \ (INT.File (_, ls)) -> unlines ls) is
+            els = map ( \ (INT.File (_, ls)) -> unlines ls) es
+            tpl = INT.Template msg ils els fs
+            xml = INT.tpl2xmls tpl
+
+        Message (MSG.Text cs)         ->
+          printLn cs >>
+          loop (nxt txt upd0 (Just cs)) eval
+        None                      ->
+          loop (nxt txt upd0 Nothing) eval
+        _________________________ ->
+          -- NOTE: Unexpected error
+          printLn "Unexpected error" >>
+          loop (nxt txt upd0 (Just [])) eval
+      where
+        afps =
+          ( \ (INT.FilePaths fps) -> map INT.AbsoluteFilePath fps
+          )
+          <$> pile ctx
+
+    Message (MSG.Path ns afp)     ->
+      eval ctx (MSG.Path ns afp) >>= \ (upd, action) ->
+      case action of
+        File (INT.File (_,ls)) ->
+          caseFile txt ns ls
+        Message (MSG.Text cs)         ->
+          printLn cs >>
+          loop (nxt txt upd (Just cs)) eval
+        None                      ->
+          loop (nxt txt upd Nothing) eval
+        _________________________ ->
+          -- NOTE: Unexpected error
+          printLn "Unexpected error" >>
+          loop (nxt txt upd (Just [])) eval
+
+    Message (MSG.List fil)        ->
+      eval ctx (MSG.List fil) >>= \ (upd, action) ->
+      case action of
+        Paths (INT.FilePaths fps) ->
+          casePaths txt fps
+        Message (MSG.Text cs)         ->
+          printLn cs >>
+          loop (nxt txt upd (Just cs)) eval
+        None                      ->
+          loop (nxt txt upd Nothing) eval
+        _________________________ ->
+          -- NOTE: Unexpected error
+          printLn "Unexpected error" >>
+          loop (nxt txt upd (Just [])) eval
+
+    Message  MSG.Repo             ->
+      eval ctx MSG.Repo >>= \ (upd, action) ->
+      case action of
+        Message (MSG.Text cs)         ->
+          printLn cs >>
+          loop (nxt txt upd (Just cs)) eval
+        None                      ->
+          loop (nxt txt upd Nothing) eval
+        _________________________ ->
+          -- NOTE: Unexpected error
+          printLn "Unexpected error" >>
+          loop (nxt txt upd (Just [])) eval
+
+    Message       msg  ->
+      eval ctx msg >>= \ (upd, action) ->
+      case action of
+        Message (MSG.Text cs)         ->
+          printLn cs >>
+          loop (nxt txt upd (Just cs)) eval
+        None                      ->
+          loop (nxt txt upd Nothing) eval
+        _________________________ ->
+          -- NOTE: Unexpected error
+          printLn "Unexpected error" >>
+          loop (nxt txt upd (Just [])) eval
+  where
+
+    -- TODO: Refactoring needed
+    txt2act txt =
+      -- TODO: Refactoring needed
+      case txt of
+
+        '/':'m':'o':'d':'e':' ':c:cs -> Mode c cs
+        '/':'m'            :' ':c:cs -> Mode c cs
+
+        '/':'l':'i':'s':'t'    :mfil ->
+          -- TODO: DRY
+          Message (MSG.List fil)
+          where
+            fil =
+              case mfil of
+                [    ] -> Just $ INT.Filter mfil
+                ' ':cs -> Just $ INT.Filter cs
+                ______ -> Nothing
+        '/':'l'                :mfil ->
+          -- TODO: DRY
+          Message (MSG.List fil)
+          where
+            fil =
+              case mfil of
+                [    ] -> Just $ INT.Filter mfil
+                ' ':cs -> Just $ INT.Filter cs
+                ______ -> Nothing
+
+        '/':'f':'i':'l':'e':' ':midx ->
+          -- TODO: DRY
+          case oidx of
+            Nothing  ->
+              Message (MSG.Path False Nothing)
+            Just idx ->
+              if 0 <= idx && idx < length pfs then
+                Message (MSG.Path False (Just $ INT.AbsoluteFilePath $ pfs !! idx))
+              else
+                Message (MSG.Path False Nothing)
+              where
+                pfs = concatMap INT.filePaths $ pile ctx
+          where
+            oidx =
+              case midx of
+                [] -> Nothing
+                cs -> readMaybe cs :: Maybe Int
+        '/':'f'            :' ':midx ->
+          -- TODO: DRY
+          case oidx of
+            Nothing  ->
+              Message (MSG.Path False Nothing)
+            Just idx ->
+              if 0 <= idx && idx < length pfs then
+                Message (MSG.Path False (Just $ INT.AbsoluteFilePath $ pfs !! idx))
+              else
+                Message (MSG.Path False Nothing)
+              where
+                pfs = concatMap INT.filePaths $ pile ctx
+          where
+            oidx =
+              case midx of
+                [] -> Nothing
+                cs -> readMaybe cs :: Maybe Int
+        '/':'n':'u':'m':'s':' ':midx ->
+          -- TODO: DRY
+          case oidx of
+            Nothing  ->
+              Message (MSG.Path True Nothing)
+            Just idx ->
+              if 0 <= idx && idx < length pfs then
+                Message (MSG.Path True (Just $ INT.AbsoluteFilePath $ pfs !! idx))
+              else
+                Message (MSG.Path True Nothing)
+              where
+                pfs = concatMap INT.filePaths $ pile ctx
+          where
+            oidx =
+              case midx of
+                [] -> Nothing
+                cs -> readMaybe cs :: Maybe Int
+        '/':'n'            :' ':midx ->
+          -- TODO: DRY
+          case oidx of
+            Nothing  ->
+              Message (MSG.Path True Nothing)
+            Just idx ->
+              if 0 <= idx && idx < length pfs then
+                Message (MSG.Path True (Just $ INT.AbsoluteFilePath $ pfs !! idx))
+              else
+                Message (MSG.Path True Nothing)
+              where
+                pfs = concatMap INT.filePaths $ pile ctx
+          where
+            oidx =
+              case midx of
+                [] -> Nothing
+                cs -> readMaybe cs :: Maybe Int
+
+        '/':'s':'e':'n':'d':' ':mesg -> Prompt mesg
+        '/':'s'            :' ':mesg -> Prompt mesg
+
+        '/':'a':'t':'o':'m':' ':mesg ->
+          -- TODO: DRY
+          Branch mesg fs
+          where
+            fs = fromMaybe (INT.Files []) (ruck ctx)
+        '/':'a'            :' ':mesg ->
+          -- TODO: DRY
+          Branch mesg fs
+          where
+            fs = fromMaybe (INT.Files []) (ruck ctx)
+
+        '/':'r':'e':'p':'o'    :[  ] -> Message MSG.Repo
+
+        '/':'r':'u':'c':'k'    :midx -> Ruck   midx
+        '/':'r'                :midx -> Ruck   midx
+
+        "/exit"                      -> Exit
+        "/e"                         -> Exit
+        "/help"                      -> Help
+        "/?"                         -> Help
+        "/drop"                      -> Drop
+        "/d"                         -> Drop
+        "/hist"                      -> Hist ( True,  True  )
+        "/h"                         -> Hist ( True,  True  )
+        "/chit"                      -> Hist ( True,  False )
+        "/chat"                      -> Hist ( False, True  )
+        "/pile"                      -> Pile
+        "/p"                         -> Pile
+        "/wipe"                      -> Wipe
+        "/w"                         -> Wipe
+
+        '/':cmd                      -> UnknownCmd cmd
+        ____________________________ -> Message (MSG.Text txt)
+
+    -- TODO: Refactoring needed
+    his       = hist ctx
+    chi       = chit his
+    hps       = prev chi
+    hns       = next chi
+    nxt p c o =
+      c
+        { hist =
+          (hist c)
+            { chit =
+              (chit $ hist c)
+                { prev = p : hps
+                }
+            , chat =
+              case o of
+                Nothing ->        chat $ hist c
+                Just  r -> (r:) $ chat $ hist c
+            }
+        }
+
+    caseExit =
+      printLn "Λ-gent will shutdown" >>
+      return ()
+
+    caseDrop txt =
+      printLn ("Dropping end-user data load") >>
+      loop
+        ( (nxt txt ctx Nothing)
+            { load = Nothing
+            }
+        ) eval
+
+    -- TODO: Refactoring needed
+    caseMode txt c cs =
+      case mmod of
+        Just mod ->
+          printLn ("Changed to " ++ low ++ "-mode") >>
+          loop
+            ( (nxt txt ctx Nothing)
+                { mode = mod
+                , pile = Just $ INT.FilePaths []
+                , ruck = Just $ INT.Files     []
+                }
+            ) eval
+          where
+            low = map toLower $ show mod
+        Nothing ->
+          printLn ("Invalid mode: " ++ c:cs) >>
+          loop ctx eval
+      where
+        mmod = readMaybe (toUpper c : map toLower cs) :: Maybe INT.Mode
+
+    caseHist txt chits chats =
+      ( if chits then
+          printLn "* Chits:" >>
+          ( mapM_ printLn . UTL.combine . UTL.chits True . prev . chit . hist
+          ) ctx
+        else
+          pure ()
+      ) >>
+      ( if chats then
+          printLn "* Chats:" >>
+          ( mapM_ printLn . UTL.combine . UTL.chats True .        chat . hist
+          ) ctx
+        else
+          pure ()
+      ) >>
+      loop (nxt txt ctx Nothing) eval
+
+    caseFile txt ns ls =
+      ( mapM_ printLn .
+        UTL.combine .
+        UTL.file ns
+      ) (unlines ls) >>
+      loop (nxt txt ctx Nothing) eval
+    caseHelp txt =
+      printLn help >>
+      loop (nxt txt ctx Nothing) eval
+
+    casePaths txt fps =
+      eval ctx MSG.Root >>= \ (upd, action) ->
+      case action of
+        Paths (INT.FilePaths rfps) ->
+          ( case rfps of
+              [cwd] ->
+                mapM_ printLn .
+                UTL.combine .
+                UTL.files [] True .
+                -- NOTE: Show relative paths
+                map (drop (length cwd)) $
+                fps
+              _____ ->
+                printLn "Missing root path"
+          ) >>
+          loop
+            ( (nxt txt upd Nothing)
+                { pile = Just $ INT.FilePaths fps
+                }
+            ) eval
+        Message (MSG.Text cs)         ->
+          printLn cs >>
+          loop (nxt txt upd (Just cs)) eval
+        None                      ->
+          loop (nxt txt upd Nothing) eval
+        _________________________ ->
+          -- NOTE: Unexpected error
+          printLn "Unexpected error" >>
+          loop (nxt txt upd (Just [])) eval
+
+    casePile txt =
+      eval ctx MSG.Root >>= \ (upd, action) ->
+      case action of
+        Paths (INT.FilePaths fps) ->
+          ( case fps of
+              [cwd] ->
+                mapM_ printLn .
+                UTL.combine .
+                UTL.files [] True .
+                -- NOTE: Show relative paths
+                map (drop (length cwd)) .
+                concatMap INT.filePaths .
+                pile $
+                upd
+              _____ ->
+                printLn "Missing root path"
+          ) >>
+          loop (nxt txt upd Nothing) eval
+        Message (MSG.Text cs)         ->
+          printLn cs >>
+          loop (nxt txt upd (Just cs)) eval
+        None                      ->
+          loop (nxt txt upd Nothing) eval
+        _________________________ ->
+          -- NOTE: Unexpected error
+          printLn "Unexpected error" >>
+          loop (nxt txt upd (Just [])) eval
+
+    caseRuck txt midx =
+      ( if null midx then
+          -- NOTE: If no optional index provided, show only paths
+          ( mapM_ printLn .
+            UTL.combine .
+            UTL.files [] True .
+            concatMap fps .
+            ruck
+          ) ctx
+        else
+          -- NOTE: Otherwise, show content or index error
+          ( case idx of
+              Just i ->
+                if 0 <= i && i < len then
+                  ( mapM_ printLn .
+                    UTL.combine .
+                    UTL.file True .
+                    concatMap f .
+                    ruck
+                  ) ctx
+                else
+                  let
+                    m = "Index (" ++ show i ++ ") is out of bounds."
+                  in
+                    printLn m
+                where
+                  f (INT.Files fs) =
+                    case fs !! i of
+                      INT.File (_,ls) -> unlines ls
+              Nothing ->
+                printLn "Invalid use of /ruck. Use space between cmd and index"
+          )
+      ) >>
+      loop (nxt txt ctx Nothing) eval
+      where
+        idx =
+          case midx of
+            [    ] -> Nothing
+            ' ':cs -> readMaybe cs :: Maybe Int
+            ______ -> Nothing
+        len =
+          case ruck ctx of
+            Just (INT.Files fs) -> length fs
+            Nothing             -> 0
+        fps (INT.Files fs) =
+          map ( \ (INT.File (p,_)) -> p) fs
+
+    caseWipe txt =
+      printLn clear >>
+      loop (nxt txt ctx Nothing) eval
+
+    caseUnknownCmd txt cmd =
+      printLn msg >>
+      loop (nxt txt ctx Nothing) eval
+      where
+        msg = "Command not recognized: " ++ cmd
+
+    -- NOTE: Clear screen & Move top-left
+    clear     = "\^[[H\^[[2J" -- NOTE: See `infocmp -x`
+    prompt    =
+      (show . AEC.bold . AEC.sgr)
+      ("Λ-" ++ (map toLower . show . mode) ctx ++ "> ")
+    read      = input
+    print     = output . show . AEC.faint . AEC.sgr
+    printLn x = print $ x ++ "\n"
+
+integrity :: IO (Either String ())
+integrity =
+  do
+    ohi <- ENV.getEnv "LLM_SIGN_SHA"
+    case ohi of
+      Nothing -> pure $ Right ()
+      Just hi ->
+        do
+          op <- cwd
+          pn <- getProgName
+          case op of
+            Left  e -> pure $ Left e
+            Right p ->
+              do
+                ehf <- sha ap
+                case ehf of
+                  Left  ef -> pure $ Left ef
+                  Right hf ->
+                    if hi == h64 then
+                      pure $ Right ()
+                    else
+                      pure $
+                      Left $
+                      "# Λ-gent integrity failed:\n" ++
+                      "> " ++ hi  ++ " (expected)\n" ++
+                      "> " ++ h64 ++ " (observed)"
+                    where
+                      h64 = take 64 hf
+              where
+                ap =
+                  concatMap id
+                  $ lines p ++ [ "/" ] ++ lines pn
+  where
+    -- TODO: Move "HELPERS (private)" private out from Internal/RIO.hs to
+    -- Internal/IO.hs and then just wrap them with `RestrictedIO`. This will
+    -- allow for logic like this to be simplified
+    cwd =
+      do
+        -- NOTE: inconsistency between `linux` and `macOS`:
+        --
+        -- - If no option is specified, -P is assumed (linux)
+        --
+        -- - If no options are specified, the -L option is assumed (macOS)
+        --
+        -- -L, --logical use PWD from environment, even if it contains symlinks
+        --
+        -- -P, --physical resolve all symlinks
+        (exitcode, out, err) <- readProcessWithExitCode "pwd" [ "-P" ] []
+        case exitcode of
+          ExitSuccess ->
+            pure $ Right out
+          ExitFailure _ ->
+            pure $ Left err
+    sha p =
+      do
+        (exitcode, out, err) <- readProcessWithExitCode "sha256sum" [ p ] []
+        case exitcode of
+          ExitSuccess ->
+            pure $ Right out
+          ExitFailure _ ->
+            pure $ Left err
diff --git a/src/Agent/LLM/Action.hs b/src/Agent/LLM/Action.hs
new file mode 100644
--- /dev/null
+++ b/src/Agent/LLM/Action.hs
@@ -0,0 +1,74 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+
+--------------------------------------------------------------------------------
+
+module Agent.LLM.Action
+  ( Action
+  , TextToFile
+    -- * LLM (Internal)
+  , File, FilePaths, Root
+    -- * Methods
+  , none
+  , exit
+  , file
+  , paths
+  , root
+  , template
+  , text
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import           Internal.LLM        ( File, FilePaths, Root )
+import qualified Internal.LLM        as INT
+import           Internal.LLM.Action ( Action, TextToFile )
+import qualified Internal.LLM.Action as ACT
+
+import qualified Agent.LLM.Message   as MSG
+
+--------------------------------------------------------------------------------
+
+none :: Action
+none =
+  ACT.None
+
+exit :: Action
+exit =
+  ACT.Exit
+
+file :: File -> Action
+file =
+  ACT.File
+
+paths :: FilePaths -> Action
+paths =
+  ACT.Paths
+
+root :: Root -> Action
+root (INT.Root afp) =
+  ACT.Paths $ INT.FilePaths [afp]
+
+template
+  :: TextToFile
+  -> [File]
+  -> [File]
+  -> [File]
+  -> Action
+template =
+  ACT.Template
+
+text :: String -> Action
+text =
+  ACT.Message . MSG.Text
diff --git a/src/Agent/LLM/Message.hs b/src/Agent/LLM/Message.hs
new file mode 100644
--- /dev/null
+++ b/src/Agent/LLM/Message.hs
@@ -0,0 +1,48 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+
+--------------------------------------------------------------------------------
+
+module Agent.LLM.Message
+  ( Message(..)
+  , AbsoluteFilePath
+  , Files
+  , Filter
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import           Internal.LLM ( AbsoluteFilePath, Files, Filter )
+
+--------------------------------------------------------------------------------
+
+data Message
+  = Atom !String !Files
+  | List !(Maybe Filter)
+  | Path !Bool !(Maybe AbsoluteFilePath)
+  | Repo
+  | Root
+  | Send ![String]
+  | Text !String
+  | Tmpl !(Maybe [AbsoluteFilePath])
+
+instance Show Message where
+  show (Atom _ _) = "Atom"
+  show (List _)   = "List"
+  show (Path _ _) = "Path"
+  show  Repo      = "Repo"
+  show  Root      = "Root"
+  show (Send _)   = "Send"
+  show (Text _)   = "Text"
+  show (Tmpl _)   = "Tmpl"
diff --git a/src/Internal/GaloisInc/Text/JSON.hs b/src/Internal/GaloisInc/Text/JSON.hs
new file mode 100644
--- /dev/null
+++ b/src/Internal/GaloisInc/Text/JSON.hs
@@ -0,0 +1,537 @@
+{-# LANGUAGE CPP, TypeSynonymInstances, FlexibleInstances #-}
+
+{-# LANGUAGE Safe #-}
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2007-2018 Galois Inc.
+-- License    : BSD-3-Clause
+-- Maintainer : Iavor S. Diatchki (iavor.diatchki@gmail.com)
+-- Stability  : experimental
+--
+-- Serialising Haskell values to and from JSON values.
+
+--------------------------------------------------------------------------------
+
+module Internal.GaloisInc.Text.JSON (
+    -- * JSON Types
+    JSValue(..)
+
+    -- * Serialization to and from JSValues
+  , JSON(..)
+
+    -- * Encoding and Decoding
+  , Result(..)
+  , encode -- :: JSON a => a -> String
+  , decode -- :: JSON a => String -> Either String a
+  , encodeStrict -- :: JSON a => a -> String
+  , decodeStrict -- :: JSON a => String -> Either String a
+
+    -- * Wrapper Types
+  , JSString
+  , toJSString
+  , fromJSString
+
+  , JSObject
+  , toJSObject
+  , fromJSObject
+  , resultToEither
+
+    -- * Serialization to and from Strings.
+    -- ** Reading JSON
+  , readJSNull, readJSBool, readJSString, readJSRational
+  , readJSArray, readJSObject, readJSValue
+
+    -- ** Writing JSON
+  , showJSNull, showJSBool, showJSArray
+  , showJSRational, showJSRational'
+  , showJSObject, showJSValue
+
+    -- ** Instance helpers
+  , makeObj, valFromObj
+  , JSKey(..), encJSDict, decJSDict
+  
+  ) where
+
+import Internal.GaloisInc.Text.JSON.Types
+import Internal.GaloisInc.Text.JSON.String
+
+import Data.Int
+import Data.Word
+
+{- NOTE: [GHC-66111] [-Wunused-imports] The import of `Control.Monad.Fail' is
+   redundant
+
+import Control.Monad.Fail (MonadFail (..))
+
+-}
+
+import Control.Monad(liftM,ap,MonadPlus(..))
+import Control.Applicative
+
+{- NOTE: Non-Safe
+
+import qualified Data.ByteString.Char8 as S
+import qualified Data.ByteString.Lazy.Char8 as L
+
+-}
+
+import qualified Data.IntSet as I
+import qualified Data.Set as Set
+import qualified Data.Map as M
+import qualified Data.IntMap as IntMap
+
+import qualified Data.Array as Array
+
+{- NOTE: Non-Safe
+
+import qualified Data.Text as T
+
+-}
+
+------------------------------------------------------------------------
+
+-- | Decode a String representing a JSON value 
+-- (either an object, array, bool, number, null)
+--
+-- This is a superset of JSON, as types other than
+-- Array and Object are allowed at the top level.
+--
+decode :: (JSON a) => String -> Result a
+decode s = case runGetJSON readJSValue s of
+             Right a  -> readJSON a
+             Left err -> Error err
+
+-- | Encode a Haskell value into a string, in JSON format.
+--
+-- This is a superset of JSON, as types other than
+-- Array and Object are allowed at the top level.
+--
+encode :: (JSON a) => a -> String
+encode = (flip showJSValue [] . showJSON)
+
+------------------------------------------------------------------------
+
+-- | Decode a String representing a strict JSON value.
+-- This follows the spec, and requires top level
+-- JSON types to be an Array or Object.
+decodeStrict :: (JSON a) => String -> Result a
+decodeStrict s = case runGetJSON readJSTopType s of
+     Right a  -> readJSON a
+     Left err -> Error err
+
+-- | Encode a value as a String in strict JSON format.
+-- This follows the spec, and requires all values
+-- at the top level to be wrapped in either an Array or Object.
+-- JSON types to be an Array or Object.
+encodeStrict :: (JSON a) => a -> String
+encodeStrict = (flip showJSTopType [] . showJSON)
+
+------------------------------------------------------------------------
+
+-- | The class of types serialisable to and from JSON
+class JSON a where
+  readJSON  :: JSValue -> Result a
+  showJSON  :: a -> JSValue
+
+  readJSONs :: JSValue -> Result [a]
+  readJSONs (JSArray as) = mapM readJSON as
+  readJSONs _            = mkError "Unable to read list"
+
+  showJSONs :: [a] -> JSValue
+  showJSONs = JSArray . map showJSON
+
+-- | A type for parser results
+data Result a = Ok a | Error String
+  deriving (Eq,Show)
+
+-- | Map Results to Eithers
+resultToEither :: Result a -> Either String a
+resultToEither (Ok a)    = Right a
+resultToEither (Error s) = Left  s
+
+instance Functor Result where fmap = liftM
+
+{- NOTE: [GHC-22705] [-Wnoncanonical-monad-instances] Noncanonical `pure = return'
+   definition detected in the instance declaration for `Applicative Result'.
+   Suggested fix: Move definition from `return' to `pure'
+
+instance Applicative Result where
+  (<*>) = ap
+  pure  = return
+
+-}
+
+instance Applicative Result where
+  pure x = Ok x
+  (<*>)  = ap
+
+instance Alternative Result where
+  Ok a    <|> _ = Ok a
+  Error _ <|> b = b
+  empty         = Error "empty"
+
+instance MonadPlus Result where
+  Ok a `mplus` _ = Ok a
+  _ `mplus` x    = x
+  mzero          = Error "Result: MonadPlus.empty"
+
+{- NOTE: [GHC-22705] [-Wnoncanonical-monad-instances] Noncanonical `return'
+   definition detected in the instance declaration for `Monad Result'.  `return'
+   will eventually be removed in favour of `pure' Suggested fix: Either remove
+   definition for `return' (recommended) or define as `return = pure
+
+instance Monad Result where
+  return x      = Ok x
+  Ok a >>= f    = f a
+  Error x >>= _ = Error x
+
+-}
+
+instance Monad Result where
+  Ok a >>= f    = f a
+  Error x >>= _ = Error x
+
+instance MonadFail Result where
+  fail x        = Error x
+
+-- | Convenient error generation
+mkError :: String -> Result a
+mkError s = Error s
+
+--------------------------------------------------------------------
+--
+-- | To ensure we generate valid JSON, we map Haskell types to JSValue
+-- internally, then pretty print that.
+--
+instance JSON JSValue where
+    showJSON = id
+    readJSON = return
+
+second :: (a -> b) -> (x,a) -> (x,b)
+second f (a,b) = (a, f b)
+
+--------------------------------------------------------------------
+-- Some simple JSON wrapper types, to avoid overlapping instances
+
+instance JSON JSString where
+  readJSON (JSString s) = return s
+  readJSON _            = mkError "Unable to read JSString"
+  showJSON = JSString
+
+instance (JSON a) => JSON (JSObject a) where
+  readJSON (JSObject o) =
+      let f (x,y) = do y' <- readJSON y; return (x,y')
+      in toJSObject `fmap` mapM f (fromJSObject o)
+  readJSON _ = mkError "Unable to read JSObject"
+  showJSON = JSObject . toJSObject . map (second showJSON) . fromJSObject
+
+
+-- -----------------------------------------------------------------
+-- Instances
+--
+
+instance JSON Bool where
+  showJSON = JSBool
+  readJSON (JSBool b) = return b
+  readJSON _          = mkError "Unable to read Bool"
+
+instance JSON Char where
+  showJSON  = JSString . toJSString . (:[])
+  showJSONs = JSString . toJSString
+
+  readJSON (JSString s) = case fromJSString s of
+                            [c] -> return c
+                            _ -> mkError "Unable to read Char"
+  readJSON _            = mkError "Unable to read Char"
+
+  readJSONs (JSString s)  = return (fromJSString s)
+  readJSONs (JSArray a)   = mapM readJSON a
+  readJSONs _             = mkError "Unable to read String"
+
+instance JSON Ordering where
+  showJSON = encJSString show
+  readJSON = decJSString "Ordering" readOrd
+    where
+     readOrd x = 
+       case x of
+         "LT" -> return Prelude.LT
+         "EQ" -> return Prelude.EQ
+         "GT" -> return Prelude.GT
+         _    -> mkError ("Unable to read Ordering")
+
+-- -----------------------------------------------------------------
+-- Integral types
+
+instance JSON Integer where
+  showJSON = JSRational False . fromIntegral
+  readJSON (JSRational _ i) = return $ round i
+  readJSON _             = mkError "Unable to read Integer"
+
+-- constrained:
+instance JSON Int where
+  showJSON = JSRational False . fromIntegral
+  readJSON (JSRational _ i) = return $ round i
+  readJSON _              = mkError "Unable to read Int"
+
+-- constrained:
+instance JSON Word where
+  showJSON = JSRational False . toRational
+  readJSON (JSRational _ i) = return $ truncate i
+  readJSON _             = mkError "Unable to read Word"
+
+-- -----------------------------------------------------------------
+
+instance JSON Word8 where
+  showJSON = JSRational False . fromIntegral
+  readJSON (JSRational _ i) = return $ truncate i
+  readJSON _             = mkError "Unable to read Word8"
+
+instance JSON Word16 where
+  showJSON = JSRational False . fromIntegral
+  readJSON (JSRational _ i) = return $ truncate i
+  readJSON _             = mkError "Unable to read Word16"
+
+instance JSON Word32 where
+  showJSON = JSRational False . fromIntegral
+  readJSON (JSRational _ i) = return $ truncate i
+  readJSON _             = mkError "Unable to read Word32"
+
+instance JSON Word64 where
+  showJSON = JSRational False . fromIntegral
+  readJSON (JSRational _ i) = return $ truncate i
+  readJSON _             = mkError "Unable to read Word64"
+
+instance JSON Int8 where
+  showJSON = JSRational False . fromIntegral
+  readJSON (JSRational _ i) = return $ truncate i
+  readJSON _             = mkError "Unable to read Int8"
+
+instance JSON Int16 where
+  showJSON = JSRational False . fromIntegral
+  readJSON (JSRational _ i) = return $ truncate i
+  readJSON _             = mkError "Unable to read Int16"
+
+instance JSON Int32 where
+  showJSON = JSRational False . fromIntegral
+  readJSON (JSRational _ i) = return $ truncate i
+  readJSON _             = mkError "Unable to read Int32"
+
+instance JSON Int64 where
+  showJSON = JSRational False . fromIntegral
+  readJSON (JSRational _ i) = return $ truncate i
+  readJSON _                = mkError "Unable to read Int64"
+
+-- -----------------------------------------------------------------
+
+instance JSON Double where
+  showJSON = JSRational False . toRational
+  readJSON (JSRational _ r) = return $ fromRational r
+  readJSON _                = mkError "Unable to read Double"
+    -- can't use JSRational here, due to ambiguous '0' parse
+    -- it will parse as Integer.
+
+instance JSON Float where
+  showJSON = JSRational True . toRational
+  readJSON (JSRational _ r) = return $ fromRational r
+  readJSON _                = mkError "Unable to read Float"
+
+-- -----------------------------------------------------------------
+-- Sums
+
+instance (JSON a) => JSON (Maybe a) where
+  readJSON (JSObject o) = case "Just" `lookup` as of
+      Just x -> Just <$> readJSON x
+      _      -> case ("Nothing" `lookup` as) of
+          Just JSNull -> return Nothing
+          _           -> mkError "Unable to read Maybe"
+    where as = fromJSObject o
+  readJSON _ = mkError "Unable to read Maybe"
+  showJSON (Just x) = JSObject $ toJSObject [("Just", showJSON x)]
+  showJSON Nothing  = JSObject $ toJSObject [("Nothing", JSNull)]
+
+instance (JSON a, JSON b) => JSON (Either a b) where
+  readJSON (JSObject o) = case "Left" `lookup` as of
+      Just a  -> Left <$> readJSON a
+      Nothing -> case "Right" `lookup` as of
+          Just b  -> Right <$> readJSON b
+          Nothing -> mkError "Unable to read Either"
+    where as = fromJSObject o
+  readJSON _ = mkError "Unable to read Either"
+  showJSON (Left a)  = JSObject $ toJSObject [("Left",  showJSON a)]
+  showJSON (Right b) = JSObject $ toJSObject [("Right", showJSON b)]
+
+-- -----------------------------------------------------------------
+-- Products
+
+instance JSON () where
+  showJSON _ = JSArray []
+  readJSON (JSArray []) = return ()
+  readJSON _      = mkError "Unable to read ()"
+
+instance (JSON a, JSON b) => JSON (a,b) where
+  showJSON (a,b) = JSArray [ showJSON a, showJSON b ]
+  readJSON (JSArray [a,b]) = (,) `fmap` readJSON a `ap` readJSON b
+  readJSON _ = mkError "Unable to read Pair"
+
+instance (JSON a, JSON b, JSON c) => JSON (a,b,c) where
+  showJSON (a,b,c) = JSArray [ showJSON a, showJSON b, showJSON c ]
+  readJSON (JSArray [a,b,c]) = (,,) `fmap`
+                                  readJSON a `ap`
+                                  readJSON b `ap`
+                                  readJSON c
+  readJSON _ = mkError "Unable to read Triple"
+
+instance (JSON a, JSON b, JSON c, JSON d) => JSON (a,b,c,d) where
+  showJSON (a,b,c,d) = JSArray [showJSON a, showJSON b, showJSON c, showJSON d]
+  readJSON (JSArray [a,b,c,d]) = (,,,) `fmap`
+                                  readJSON a `ap`
+                                  readJSON b `ap`
+                                  readJSON c `ap`
+                                  readJSON d
+
+  readJSON _ = mkError "Unable to read 4 tuple"
+
+-- -----------------------------------------------------------------
+-- List-like types
+
+
+instance JSON a => JSON [a] where
+  showJSON = showJSONs
+  readJSON = readJSONs
+
+-- container types:
+
+#if !defined(MAP_AS_DICT)
+instance (Ord a, JSON a, JSON b) => JSON (M.Map a b) where
+  showJSON = encJSArray M.toList
+  readJSON = decJSArray "Map" M.fromList
+
+instance (JSON a) => JSON (IntMap.IntMap a) where
+  showJSON = encJSArray IntMap.toList
+  readJSON = decJSArray "IntMap" IntMap.fromList
+
+#else
+instance (Ord a, JSKey a, JSON b) => JSON (M.Map a b) where
+  showJSON    = encJSDict . M.toList
+  readJSON o  = M.fromList <$> decJSDict "Map" o
+
+instance (JSON a) => JSON (IntMap.IntMap a) where
+  {- alternate (dict) mapping: -}
+  showJSON    = encJSDict . IntMap.toList
+  readJSON o  = IntMap.fromList <$> decJSDict "IntMap" o
+#endif
+
+
+instance (Ord a, JSON a) => JSON (Set.Set a) where
+  showJSON = encJSArray Set.toList
+  readJSON = decJSArray "Set" Set.fromList
+
+instance (Array.Ix i, JSON i, JSON e) => JSON (Array.Array i e) where
+  showJSON = encJSArray Array.assocs
+  readJSON = decJSArray "Array" arrayFromList
+
+instance JSON I.IntSet where
+  showJSON = encJSArray I.toList
+  readJSON = decJSArray "IntSet" I.fromList
+
+-- helper functions for array / object serializers:
+arrayFromList :: (Array.Ix i) => [(i,e)] -> Array.Array i e
+arrayFromList [] = Array.array undefined []
+arrayFromList ls@((i,_):xs) = Array.array bnds ls
+  where
+  bnds = foldr step (i,i) xs
+
+  step (ix,_) (mi,ma) =
+    let mi1 = min ix mi
+        ma1 = max ix ma
+    in mi1 `seq` ma1 `seq` (mi1,ma1)
+
+{- NOTE: Non-Safe
+
+-- -----------------------------------------------------------------
+-- ByteStrings
+
+instance JSON S.ByteString where
+  showJSON = encJSString S.unpack
+  readJSON = decJSString "ByteString" (return . S.pack)
+
+instance JSON L.ByteString where
+  showJSON = encJSString L.unpack
+  readJSON = decJSString "Lazy.ByteString" (return . L.pack)
+
+-- -----------------------------------------------------------------
+-- Data.Text
+
+instance JSON T.Text where
+  readJSON (JSString s) = return (T.pack . fromJSString $ s)
+  readJSON _            = mkError "Unable to read JSString"
+  showJSON              = JSString . toJSString . T.unpack
+
+-}
+
+-- -----------------------------------------------------------------
+-- Instance Helpers
+
+makeObj :: [(String, JSValue)] -> JSValue
+makeObj = JSObject . toJSObject
+
+-- | Pull a value out of a JSON object.
+valFromObj :: JSON a => String -> JSObject JSValue -> Result a
+valFromObj k o = maybe (Error $ "valFromObj: Could not find key: " ++ show k)
+                       readJSON
+                       (lookup k (fromJSObject o))
+
+encJSString :: (a -> String) -> a -> JSValue
+encJSString f v = JSString (toJSString (f v))
+
+decJSString :: String -> (String -> Result a) -> JSValue -> Result a
+decJSString _ f (JSString s) = f (fromJSString s)
+decJSString l _ _ = mkError ("readJSON{"++l++"}: unable to parse string value")
+
+encJSArray :: (JSON a) => (b-> [a]) -> b -> JSValue
+encJSArray f v = showJSON (f v)
+
+decJSArray :: (JSON a) => String -> ([a] -> b) -> JSValue -> Result b
+decJSArray _ f a@JSArray{} = f <$> readJSON a
+decJSArray l _ _ = mkError ("readJSON{"++l++"}: unable to parse array value")
+
+-- | Haskell types that can be used as keys in JSON objects.
+class JSKey a where
+  toJSKey   :: a -> String
+  fromJSKey :: String -> Maybe a
+
+instance JSKey JSString where
+  toJSKey x   = fromJSString x
+  fromJSKey x = Just (toJSString x)
+
+instance JSKey Int where
+  toJSKey   = show
+  fromJSKey key = case reads key of
+                    [(a,"")] -> Just a
+                    _        -> Nothing
+
+-- NOTE: This prevents us from making other instances for lists but,
+-- our guess is that strings are used as keys more often then other list types.
+instance JSKey String where
+  toJSKey   = id
+  fromJSKey = Just
+  
+-- | Encode an association list as 'JSObject' value.
+encJSDict :: (JSKey a, JSON b) => [(a,b)] -> JSValue
+encJSDict v = makeObj [ (toJSKey x, showJSON y) | (x,y) <- v ]
+
+-- | Decode a 'JSObject' value into an association list.
+decJSDict :: (JSKey a, JSON b)
+          => String
+          -> JSValue
+          -> Result [(a,b)]
+decJSDict l (JSObject o) = mapM rd (fromJSObject o)
+  where rd (a,b) = case fromJSKey a of
+                     Just pa -> readJSON b >>= \pb -> return (pa,pb)
+                     Nothing -> mkError ("readJSON{" ++ l ++ "}:" ++
+                                    "unable to read dict; invalid object key")
+
+decJSDict l _ = mkError ("readJSON{"++l ++ "}: unable to read dict; expected JSON object")
diff --git a/src/Internal/GaloisInc/Text/JSON/Generic.hs b/src/Internal/GaloisInc/Text/JSON/Generic.hs
new file mode 100644
--- /dev/null
+++ b/src/Internal/GaloisInc/Text/JSON/Generic.hs
@@ -0,0 +1,241 @@
+{-# LANGUAGE PatternGuards #-}
+
+{-# LANGUAGE Safe #-}
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2007-2018 Galois Inc.
+-- License    : BSD-3-Clause
+-- Maintainer : Iavor S. Diatchki (iavor.diatchki@gmail.com)
+-- Stability  : experimental
+--
+-- JSON serializer and deserializer using Data.Generics.
+-- The functions here handle algebraic data types and primitive types.
+-- It uses the same representation as "Internal.GaloisInc.Text.JSON" for "Prelude"
+-- types.
+
+--------------------------------------------------------------------------------
+
+module Internal.GaloisInc.Text.JSON.Generic
+    ( module Internal.GaloisInc.Text.JSON
+    , Data
+    , Typeable
+    , toJSON
+    , fromJSON
+    , encodeJSON
+    , decodeJSON
+
+    , toJSON_generic
+    , fromJSON_generic
+    ) where
+
+import Control.Monad.State
+import Internal.GaloisInc.Text.JSON
+import Internal.GaloisInc.Text.JSON.String ( runGetJSON )
+
+{- NOTE: `Data.Generics` from `syb` just wraps `Data.Data` from `base`:
+   https://github.com/dreixel/syb/blob/master/src/Data/Generics.hs
+   https://hackage-content.haskell.org/package/syb-0.7.3/docs/Data-Generics.html
+   https://hackage-content.haskell.org/package/base-4.19.2.0/docs/Data-Data.html
+
+import Data.Generics
+
+-}
+
+import Data.Data
+
+import Data.Word
+import Data.Int
+
+{- NOTE: Non-Safe
+
+import qualified Data.ByteString.Char8 as S
+import qualified Data.ByteString.Lazy.Char8 as L
+
+-}
+
+import qualified Data.IntSet as I
+-- FIXME: The JSON library treats this specially, needs ext2Q
+-- import qualified Data.Map as M
+
+import Internal.GlasgowUniversity.Data.Generics.Aliases
+
+type T a = a -> JSValue
+
+-- |Convert anything to a JSON value.
+toJSON :: (Data a) => a -> JSValue
+toJSON = toJSON_generic
+         `ext1Q` jList
+         -- Use the standard encoding for all base types.
+         `extQ` (showJSON :: T Integer)
+         `extQ` (showJSON :: T Int)
+         `extQ` (showJSON :: T Word8)
+         `extQ` (showJSON :: T Word16)
+         `extQ` (showJSON :: T Word32)
+         `extQ` (showJSON :: T Word64)
+         `extQ` (showJSON :: T Int8)
+         `extQ` (showJSON :: T Int16)
+         `extQ` (showJSON :: T Int32)
+         `extQ` (showJSON :: T Int64)
+         `extQ` (showJSON :: T Double)
+         `extQ` (showJSON :: T Float)
+         `extQ` (showJSON :: T Char)
+         `extQ` (showJSON :: T String)
+         -- Bool has a special encoding.
+         `extQ` (showJSON :: T Bool)
+         `extQ` (showJSON :: T ())
+         `extQ` (showJSON :: T Ordering)
+
+         -- More special cases.
+         `extQ` (showJSON :: T I.IntSet)
+         
+         {- NOTE: Non-Safe
+
+         `extQ` (showJSON :: T S.ByteString)
+         `extQ` (showJSON :: T L.ByteString)
+
+         -}
+  where
+        -- Lists are simply coded as arrays.
+        jList vs = JSArray $ map toJSON vs
+
+
+toJSON_generic :: (Data a) => a -> JSValue
+toJSON_generic = generic
+  where
+        -- Generic encoding of an algebraic data type.
+        --   No constructor, so it must be an error value.  Code it anyway as JSNull.
+        --   Elide a single constructor and just code the arguments.
+        --   For multiple constructors, make an object with a field name that is the
+        --   constructor (except lower case) and the data is the arguments encoded.
+        generic a =
+            case dataTypeRep (dataTypeOf a) of
+                AlgRep []  -> JSNull
+                AlgRep [c] -> encodeArgs c (gmapQ toJSON a)
+                AlgRep _   -> encodeConstr (toConstr a) (gmapQ toJSON a)
+                rep        -> err (dataTypeOf a) rep
+           where
+              err dt r = error $ "toJSON: not AlgRep " ++ show r ++ "(" ++ show dt ++ ")"
+        -- Encode nullary constructor as a string.
+        -- Encode non-nullary constructors as an object with the constructor
+        -- name as the single field and the arguments as the value.
+        -- Use an array if the are no field names, but elide singleton arrays,
+        -- and use an object if there are field names.
+        encodeConstr c [] = JSString $ toJSString $ constrString c
+        encodeConstr c as = jsObject [(constrString c, encodeArgs c as)]
+
+        constrString = showConstr
+
+        encodeArgs c = encodeArgs' (constrFields c)
+        encodeArgs' [] [j] = j
+        encodeArgs' [] js  = JSArray js
+        encodeArgs' ns js  = jsObject $ zip (map mungeField ns) js
+
+        -- Skip leading '_' in field name so we can use keywords etc. as field names.
+        mungeField ('_':cs) = cs
+        mungeField cs = cs
+
+        jsObject :: [(String, JSValue)] -> JSValue
+        jsObject = JSObject . toJSObject
+
+
+type F a = Result a
+
+-- |Convert a JSON value to anything (fails if the types do not match).
+fromJSON :: (Data a) => JSValue -> Result a
+fromJSON j = fromJSON_generic j
+             `ext1R` jList
+
+             `extR` (value :: F Integer)
+             `extR` (value :: F Int)
+             `extR` (value :: F Word8)
+             `extR` (value :: F Word16)
+             `extR` (value :: F Word32)
+             `extR` (value :: F Word64)
+             `extR` (value :: F Int8)
+             `extR` (value :: F Int16)
+             `extR` (value :: F Int32)
+             `extR` (value :: F Int64)
+             `extR` (value :: F Double)
+             `extR` (value :: F Float)
+             `extR` (value :: F Char)
+             `extR` (value :: F String)
+
+             `extR` (value :: F Bool)
+             `extR` (value :: F ())
+             `extR` (value :: F Ordering)
+
+             `extR` (value :: F I.IntSet)
+         
+             {- NOTE: Non-Safe
+
+             `extR` (value :: F S.ByteString)
+             `extR` (value :: F L.ByteString)
+
+             -}
+  where value :: (JSON a) => Result a
+        value = readJSON j
+
+        jList :: (Data e) => Result [e]
+        jList = case j of
+                JSArray js -> mapM fromJSON js
+                _ -> Error $ "fromJSON: Prelude.[] bad data: " ++ show j
+
+
+
+fromJSON_generic :: (Data a) => JSValue -> Result a
+fromJSON_generic j = generic
+  where
+        typ = dataTypeOf $ resType generic
+        generic = case dataTypeRep typ of
+                      AlgRep []  -> case j of JSNull -> return (error "Empty type"); _ -> Error $ "fromJSON: no-constr bad data"
+                      AlgRep [_] -> decodeArgs (indexConstr typ 1) j
+                      AlgRep _   -> do (c, j') <- getConstr typ j; decodeArgs c j'
+                      rep        -> Error $ "fromJSON: " ++ show rep ++ "(" ++ show typ ++ ")"
+        getConstr t (JSObject o) | [(s, j')] <- fromJSObject o = do c <- readConstr' t s; return (c, j')
+        getConstr t (JSString js) = do c <- readConstr' t (fromJSString js); return (c, JSNull) -- handle nullare constructor
+        getConstr _ _ = Error "fromJSON: bad constructor encoding"
+        readConstr' t s =
+          maybe (Error $ "fromJSON: unknown constructor: " ++ s ++ " " ++ show t)
+                return $ readConstr t s
+
+        decodeArgs c = decodeArgs' (numConstrArgs (resType generic) c) c (constrFields c)
+        decodeArgs' 0 c  _       JSNull               = construct c []   -- nullary constructor
+        decodeArgs' 1 c []       jd                   = construct c [jd] -- unary constructor
+        decodeArgs' n c []       (JSArray js) | n > 1 = construct c js   -- no field names
+        -- FIXME? We could allow reading an array into a constructor with field names.
+        decodeArgs' _ c fs@(_:_) (JSObject o)         = selectFields (fromJSObject o) fs >>= construct c -- field names
+        decodeArgs' _ c _        jd                   = Error $ "fromJSON: bad decodeArgs data " ++ show (c, jd)
+
+        -- Build the value by stepping through the list of subparts.
+        construct c = evalStateT $ fromConstrM f c
+          where f :: (Data a) => StateT [JSValue] Result a
+                f = do js <- get; case js of [] -> lift $ Error "construct: empty list"; j' : js' -> do put js'; lift $ fromJSON j'
+
+        -- Select the named fields from a JSON object.  FIXME? Should this use a map?
+        selectFields fjs = mapM sel
+          where sel f = maybe (Error $ "fromJSON: field does not exist " ++ f) Ok $ lookup f fjs
+
+        -- Count how many arguments a constructor has.  The value x is used to determine what type the constructor returns.
+        numConstrArgs :: (Data a) => a -> Constr -> Int
+        numConstrArgs x c = execState (fromConstrM f c `asTypeOf` return x) 0
+          where f = do modify (+1); return undefined
+
+        resType :: Result a -> a
+        resType _ = error "resType"
+
+-- |Encode a value as a string.
+encodeJSON :: (Data a) => a -> String
+encodeJSON x = showJSValue (toJSON x) ""
+
+-- |Decode a string as a value.
+decodeJSON :: (Data a) => String -> a
+decodeJSON s =
+    case runGetJSON readJSValue s of
+    Left msg -> error msg
+    Right j ->
+        case fromJSON j of
+        Error msg -> error msg
+        Ok x -> x
diff --git a/src/Internal/GaloisInc/Text/JSON/String.hs b/src/Internal/GaloisInc/Text/JSON/String.hs
new file mode 100644
--- /dev/null
+++ b/src/Internal/GaloisInc/Text/JSON/String.hs
@@ -0,0 +1,412 @@
+{-# LANGUAGE Safe #-}
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2007-2018 Galois Inc.
+-- License    : BSD-3-Clause
+-- Maintainer : Iavor S. Diatchki (iavor.diatchki@gmail.com)
+-- Stability  : experimental
+--
+-- Basic support for working with JSON values.
+
+--------------------------------------------------------------------------------
+
+module Internal.GaloisInc.Text.JSON.String 
+     ( 
+       -- * Parsing
+       --
+       GetJSON
+     , runGetJSON
+
+       -- ** Reading JSON
+     , readJSNull
+     , readJSBool
+     , readJSString
+     , readJSRational
+     , readJSArray
+     , readJSObject
+
+     , readJSValue
+     , readJSTopType
+
+       -- ** Writing JSON
+     , showJSNull
+     , showJSBool
+     , showJSArray
+     , showJSObject
+     , showJSRational
+     , showJSRational'
+
+     , showJSValue
+     , showJSTopType
+     ) where
+
+import Prelude hiding (fail)
+import Internal.GaloisInc.Text.JSON.Types (JSValue(..),
+                        JSString, toJSString, fromJSString,
+                        JSObject, toJSObject, fromJSObject)
+
+import Control.Monad (liftM, ap)
+import Control.Monad.Fail (MonadFail (..))
+
+{- NOTE: [GHC-66111] [-Wunused-imports] The import of `Control.Applicative' is
+   redundant
+
+import Control.Applicative((<$>))
+
+-}
+
+import qualified Control.Applicative as A
+
+{- NOTE: [GHC-38856] [-Wunused-imports] The import of `digitToInt' from module
+   `Data.Char' is redundant
+
+import Data.Char (isSpace, isDigit, digitToInt)
+
+-}
+
+import Data.Char (isSpace, isDigit)
+
+{- NOTE: [GHC-38856] [-Wunused-imports] The import of `%' from module `Data.Ratio'
+   is redundant
+
+import Data.Ratio (numerator, denominator, (%))
+
+-}
+
+import Data.Ratio (numerator, denominator)
+
+{- NOTE: [GHC-38856] [-Wunused-imports] The import of `readDec' from module
+   `Numeric' is redundant
+
+
+import Numeric (readHex, readDec, showHex, readSigned, readFloat)
+
+-}
+
+import Numeric (readHex, showHex, readSigned, readFloat)
+
+-- -----------------------------------------------------------------
+-- | Parsing JSON
+
+-- | The type of JSON parsers for String
+newtype GetJSON a = GetJSON { un :: String -> Either String (a,String) }
+
+{- NOTE: [GHC-22705] [-Wnoncanonical-monad-instances] Noncanonical `pure = return'
+   definition detected in the instance declaration for `Applicative GetJSON'.
+   Suggested fix: Move definition from `return' to `pure'
+
+instance Functor GetJSON where fmap = liftM
+instance A.Applicative GetJSON where
+  pure  = return
+  (<*>) = ap
+
+instance Monad GetJSON where
+  return x        = GetJSON (\s -> Right (x,s))
+  GetJSON m >>= f = GetJSON (\s -> case m s of
+                                     Left err -> Left err
+                                     Right (a,s1) -> un (f a) s1)
+
+-}
+
+instance Functor GetJSON where fmap = liftM
+instance A.Applicative GetJSON where
+  pure x = GetJSON (\s -> Right (x,s))
+  (<*>)  = ap
+
+instance Monad GetJSON where
+  GetJSON m >>= f = GetJSON (\s -> case m s of
+                                     Left err -> Left err
+                                     Right (a,s1) -> un (f a) s1)
+
+instance MonadFail GetJSON where
+  fail x          = GetJSON (\_ -> Left x)
+
+-- | Run a JSON reader on an input String, returning some Haskell value.
+-- All input will be consumed.
+runGetJSON :: GetJSON a -> String -> Either String a
+runGetJSON (GetJSON m) s = case m s of
+     Left err    -> Left err
+     Right (a,t) -> case t of
+                        [] -> Right a
+                        _  -> Left $ "Invalid tokens at end of JSON string: "++ show (take 10 t)
+
+getInput   :: GetJSON String
+getInput    = GetJSON (\s -> Right (s,s))
+
+setInput   :: String -> GetJSON ()
+setInput s  = GetJSON (\_ -> Right ((),s))
+
+-------------------------------------------------------------------------
+
+-- | Find 8 chars context, for error messages
+context :: String -> String
+context s = take 8 s
+
+-- | Read the JSON null type
+readJSNull :: GetJSON JSValue
+readJSNull = do
+  xs <- getInput
+  case xs of
+    'n':'u':'l':'l':xs1 -> setInput xs1 >> return JSNull
+    _ -> fail $ "Unable to parse JSON null: " ++ context xs
+
+tryJSNull :: GetJSON JSValue -> GetJSON JSValue
+tryJSNull k = do
+  xs <- getInput
+  case xs of
+    'n':'u':'l':'l':xs1 -> setInput xs1 >> return JSNull
+    _ -> k 
+
+-- | Read the JSON Bool type
+readJSBool :: GetJSON JSValue
+readJSBool = do
+  xs <- getInput
+  case xs of
+    't':'r':'u':'e':xs1 -> setInput xs1 >> return (JSBool True)
+    'f':'a':'l':'s':'e':xs1 -> setInput xs1 >> return (JSBool False)
+    _ -> fail $ "Unable to parse JSON Bool: " ++ context xs
+
+-- | Read the JSON String type
+readJSString :: GetJSON JSValue
+readJSString = do
+  x <- getInput
+  case x of
+       '"' : cs -> parse [] cs
+       _        -> fail $ "Malformed JSON: expecting string: " ++ context x
+ where 
+  parse rs cs = 
+    case cs of
+      '\\' : c : ds -> esc rs c ds
+      '"'  : ds     -> do setInput ds
+                          return (JSString (toJSString (reverse rs)))
+      c    : ds
+       | c >= '\x20' && c <= '\xff'    -> parse (c:rs) ds
+       | c < '\x20'     -> fail $ "Illegal unescaped character in string: " ++ context cs
+       | i <= 0x10ffff  -> parse (c:rs) ds
+       | otherwise -> fail $ "Illegal unescaped character in string: " ++ context cs
+       where
+        i = (fromIntegral (fromEnum c) :: Integer)
+      _ -> fail $ "Unable to parse JSON String: unterminated String: " ++ context cs
+
+  esc rs c cs = case c of
+   '\\' -> parse ('\\' : rs) cs
+   '"'  -> parse ('"'  : rs) cs
+   'n'  -> parse ('\n' : rs) cs
+   'r'  -> parse ('\r' : rs) cs
+   't'  -> parse ('\t' : rs) cs
+   'f'  -> parse ('\f' : rs) cs
+   'b'  -> parse ('\b' : rs) cs
+   '/'  -> parse ('/'  : rs) cs
+   'u'  -> case cs of
+             d1 : d2 : d3 : d4 : cs' ->
+               case readHex [d1,d2,d3,d4] of
+                 [(n,"")] -> parse (toEnum n : rs) cs'
+
+                 x -> fail $ "Unable to parse JSON String: invalid hex: " ++ context (show x)
+             _ -> fail $ "Unable to parse JSON String: invalid hex: " ++ context cs
+   _ ->  fail $ "Unable to parse JSON String: invalid escape char: " ++ show c
+
+
+-- | Read an Integer or Double in JSON format, returning a Rational
+readJSRational :: GetJSON Rational
+readJSRational = do
+  cs <- getInput
+  case (reads cs, readSigned readFloat cs) of
+    ([(x,_)], _)
+      | isInfinite (x :: Double) ->
+          fail ("JSON Rational out of range: " ++ context cs)
+    (_, [(y,cs')]) -> setInput cs' >> return y
+    _ -> fail ("Unable to parse JSON Rational: " ++ context cs)
+
+
+-- | Read a list in JSON format
+readJSArray  :: GetJSON JSValue
+readJSArray  = readSequence '[' ']' ',' >>= return . JSArray
+
+-- | Read an object in JSON format
+readJSObject :: GetJSON JSValue
+readJSObject = readAssocs '{' '}' ',' >>= return . JSObject . toJSObject
+
+
+-- | Read a sequence of items
+readSequence :: Char -> Char -> Char -> GetJSON [JSValue]
+readSequence start end sep = do
+  zs <- getInput
+  case dropWhile isSpace zs of
+    c : cs | c == start ->
+        case dropWhile isSpace cs of
+            d : ds | d == end -> setInput (dropWhile isSpace ds) >> return []
+            ds                -> setInput ds >> parse []
+    _ -> fail $ "Unable to parse JSON sequence: sequence stars with invalid character: " ++ context zs
+
+  where parse rs = rs `seq` do
+          a  <- readJSValue
+          ds <- getInput
+          case dropWhile isSpace ds of
+            e : es | e == sep -> do setInput (dropWhile isSpace es)
+                                    parse (a:rs)
+                   | e == end -> do setInput (dropWhile isSpace es)
+                                    return (reverse (a:rs))
+            _ -> fail $ "Unable to parse JSON array: unterminated array: " ++ context ds
+
+
+-- | Read a sequence of JSON labelled fields
+readAssocs :: Char -> Char -> Char -> GetJSON [(String,JSValue)]
+readAssocs start end sep = do
+  zs <- getInput
+  case dropWhile isSpace zs of
+    c:cs | c == start -> case dropWhile isSpace cs of
+            d:ds | d == end -> setInput (dropWhile isSpace ds) >> return []
+            ds              -> setInput ds >> parsePairs []
+    _ -> fail "Unable to parse JSON object: unterminated object"
+
+  where parsePairs rs = rs `seq` do
+          a  <- do k  <- do x <- readJSString ; case x of
+                                JSString s -> return (fromJSString s)
+                                _          -> fail $ "Malformed JSON field labels: object keys must be quoted strings."
+                   ds <- getInput
+                   case dropWhile isSpace ds of
+                       ':':es -> do setInput (dropWhile isSpace es)
+                                    v <- readJSValue
+                                    return (k,v)
+                       _      -> fail $ "Malformed JSON labelled field: " ++ context ds
+
+          ds <- getInput
+          case dropWhile isSpace ds of
+            e : es | e == sep -> do setInput (dropWhile isSpace es)
+                                    parsePairs (a:rs)
+                   | e == end -> do setInput (dropWhile isSpace es)
+                                    return (reverse (a:rs))
+            _ -> fail $ "Unable to parse JSON object: unterminated sequence: "
+                            ++ context ds
+
+-- | Read one of several possible JS types
+readJSValue :: GetJSON JSValue
+readJSValue = do
+  cs <- getInput
+  case cs of
+    '"' : _ -> readJSString
+    '[' : _ -> readJSArray
+    '{' : _ -> readJSObject
+    't' : _ -> readJSBool
+    'f' : _ -> readJSBool
+    (x:_) | isDigit x || x == '-' -> JSRational False <$> readJSRational
+    xs -> tryJSNull
+             (fail $ "Malformed JSON: invalid token in this context " ++ context xs)
+
+-- | Top level JSON can only be Arrays or Objects
+readJSTopType :: GetJSON JSValue
+readJSTopType = do
+  cs <- getInput
+  case cs of
+    '[' : _ -> readJSArray
+    '{' : _ -> readJSObject
+    _       -> fail "Invalid JSON: a JSON text a serialized object or array at the top level."
+
+-- -----------------------------------------------------------------
+-- | Writing JSON
+
+-- | Show strict JSON top level types. Values not permitted
+-- at the top level are wrapped in a singleton array.
+showJSTopType :: JSValue -> ShowS
+showJSTopType (JSArray a)    = showJSArray a
+showJSTopType (JSObject o)   = showJSObject o
+showJSTopType x              = showJSTopType $ JSArray [x]
+
+-- | Show JSON values
+showJSValue :: JSValue -> ShowS
+showJSValue jv =
+  case jv of
+    JSNull{}         -> showJSNull
+    JSBool b         -> showJSBool b
+    JSRational asF r -> showJSRational' asF r
+    JSArray a        -> showJSArray a
+    JSString s       -> showJSString s
+    JSObject o       -> showJSObject o
+
+-- | Write the JSON null type
+showJSNull :: ShowS
+showJSNull = showString "null"
+
+-- | Write the JSON Bool type
+showJSBool :: Bool -> ShowS
+showJSBool True  = showString "true"
+showJSBool False = showString "false"
+
+-- | Write the JSON String type
+showJSString :: JSString -> ShowS
+showJSString x xs = quote (encJSString x (quote xs))
+  where
+        quote = showChar '"'
+
+-- | Show a Rational in JSON format
+showJSRational :: Rational -> ShowS
+showJSRational r = showJSRational' False r
+
+showJSRational' :: Bool -> Rational -> ShowS
+showJSRational' asFloat r 
+ | denominator r == 1      = shows $ numerator r
+ | isInfinite x || isNaN x = showJSNull
+ | asFloat                 = shows xf
+ | otherwise               = shows x
+ where 
+   x :: Double
+   x = realToFrac r
+   
+   xf :: Float
+   xf = realToFrac r
+
+
+
+-- | Show a list in JSON format
+showJSArray :: [JSValue] -> ShowS
+showJSArray = showSequence '[' ']' ','
+
+-- | Show an association list in JSON format
+showJSObject :: JSObject JSValue -> ShowS
+showJSObject = showAssocs '{' '}' ',' . fromJSObject
+
+-- | Show a generic sequence of pairs in JSON format
+showAssocs :: Char -> Char -> Char -> [(String,JSValue)] -> ShowS
+showAssocs start end sep xs rest = start : go xs
+  where
+  go [(k,v)]     = '"' : encJSString (toJSString k)
+                            ('"' : ':' : showJSValue v (go []))
+  go ((k,v):kvs) = '"' : encJSString (toJSString k)
+                            ('"' : ':' : showJSValue v (sep : go kvs))
+  go []          = end : rest
+
+-- | Show a generic sequence in JSON format
+showSequence :: Char -> Char -> Char -> [JSValue] -> ShowS
+showSequence start end sep xs rest = start : go xs
+  where
+  go [y]        = showJSValue y (go [])
+  go (y:ys)     = showJSValue y (sep : go ys)
+  go []         = end : rest
+
+encJSString :: JSString -> ShowS
+encJSString jss ss = go (fromJSString jss)
+  where
+  go s1 =
+    case s1 of
+      (x   :xs) | x < '\x20' -> '\\' : encControl x (go xs)
+      ('"' :xs)              -> '\\' : '"'  : go xs
+      ('\\':xs)              -> '\\' : '\\' : go xs
+      (x   :xs)              -> x    : go xs
+      ""                     -> ss
+
+  encControl x xs = case x of
+    '\b' -> 'b' : xs
+    '\f' -> 'f' : xs
+    '\n' -> 'n' : xs
+    '\r' -> 'r' : xs
+    '\t' -> 't' : xs
+    _ | x < '\x10'   -> 'u' : '0' : '0' : '0' : hexxs
+      | x < '\x100'  -> 'u' : '0' : '0' : hexxs
+      | x < '\x1000' -> 'u' : '0' : hexxs
+      | otherwise    -> 'u' : hexxs
+      where hexxs = showHex (fromEnum x) xs
+
diff --git a/src/Internal/GaloisInc/Text/JSON/Types.hs b/src/Internal/GaloisInc/Text/JSON/Types.hs
new file mode 100644
--- /dev/null
+++ b/src/Internal/GaloisInc/Text/JSON/Types.hs
@@ -0,0 +1,126 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+
+{-# LANGUAGE Safe #-}
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2007-2018 Galois Inc.
+-- License    : BSD-3-Clause
+-- Maintainer : Iavor S. Diatchki (iavor.diatchki@gmail.com)
+-- Stability  : experimental
+--
+-- Basic support for working with JSON values.
+
+--------------------------------------------------------------------------------
+
+module Internal.GaloisInc.Text.JSON.Types (
+
+    -- * JSON Types
+    JSValue(..)
+
+    -- * Wrapper Types
+  , JSString({-fromJSString-}..)
+  , toJSString
+
+  , JSObject({-fromJSObject-}..)
+  , toJSObject
+
+  , get_field
+  , set_field
+
+  ) where
+
+{- NOTE: [GHC-66111] [-Wunused-imports] The import of `Data.Typeable' is redundant
+
+import Data.Typeable ( Typeable )
+
+-}
+
+import Data.String(IsString(..))
+
+--
+-- | JSON values
+--
+-- The type to which we encode Haskell values. There's a set
+-- of primitives, and a couple of heterogenous collection types.
+--
+-- Objects:
+--
+-- An object structure is represented as a pair of curly brackets
+-- surrounding zero or more name\/value pairs (or members).  A name is a
+-- string.  A single colon comes after each name, separating the name
+-- from the value.  A single comma separates a value from a
+-- following name.
+--
+-- Arrays:
+--
+-- An array structure is represented as square brackets surrounding
+-- zero or more values (or elements).  Elements are separated by commas.
+--
+-- Only valid JSON can be constructed this way
+--
+data JSValue
+    = JSNull
+    | JSBool     !Bool
+    | JSRational Bool{-as Float?-} !Rational
+    | JSString   JSString
+    | JSArray    [JSValue]
+    | JSObject   (JSObject JSValue)
+    
+    {- NOTE: [GHC-90584] [-Wderiving-typeable] Deriving `Typeable' has no effect: all
+       types now auto-derive Typeable
+
+    deriving (Show, Read, Eq, Ord, Typeable)
+
+    -}
+
+    deriving (Show, Read, Eq, Ord)
+
+-- | Strings can be represented a little more efficiently in JSON
+newtype JSString   = JSONString { fromJSString :: String }
+    
+    {- NOTE: [GHC-90584] [-Wderiving-typeable] Deriving `Typeable' has no effect: all
+       types now auto-derive Typeable
+
+    deriving (Show, Read, Eq, Ord, Typeable)
+
+    -}
+                   
+    deriving (Eq, Ord, Show, Read)
+
+-- | Turn a Haskell string into a JSON string.
+toJSString :: String -> JSString
+toJSString = JSONString
+  -- Note: we don't encode the string yet, that's done when serializing.
+
+instance IsString JSString where
+  fromString = toJSString
+
+instance IsString JSValue where
+  fromString = JSString . fromString
+
+-- | As can association lists
+newtype JSObject e = JSONObject { fromJSObject :: [(String, e)] }
+    
+    {- NOTE: [GHC-90584] [-Wderiving-typeable] Deriving `Typeable' has no effect: all
+       types now auto-derive Typeable
+
+    deriving (Show, Read, Eq, Ord, Typeable)
+
+    -}
+                   
+    deriving (Eq, Ord, Show, Read)
+
+-- | Make JSON object out of an association list.
+toJSObject :: [(String,a)] -> JSObject a
+toJSObject = JSONObject
+
+-- | Get the value of a field, if it exist.
+get_field :: JSObject a -> String -> Maybe a
+get_field (JSONObject xs) x = lookup x xs
+
+-- | Set the value of a field.  Previous values are overwritten.
+set_field :: JSObject a -> String -> a -> JSObject a
+set_field (JSONObject xs) k v = JSONObject ((k,v) : filter ((/= k).fst) xs)
diff --git a/src/Internal/GlasgowUniversity/Data/Generics/Aliases.hs b/src/Internal/GlasgowUniversity/Data/Generics/Aliases.hs
new file mode 100644
--- /dev/null
+++ b/src/Internal/GlasgowUniversity/Data/Generics/Aliases.hs
@@ -0,0 +1,754 @@
+{-# LANGUAGE RankNTypes, CPP #-}
+
+{-# LANGUAGE Safe #-}
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Data.Generics.Aliases
+-- Copyright   :  (c) The University of Glasgow, CWI 2001--2004
+-- License     :  BSD-style (see the LICENSE file)
+--
+-- Maintainer  :  generics@haskell.org
+-- Stability   :  experimental
+-- Portability :  non-portable (local universal quantification)
+--
+-- This module provides a number of declarations for typical generic
+-- function types, corresponding type case, and others.
+--
+-----------------------------------------------------------------------------
+
+module Internal.GlasgowUniversity.Data.Generics.Aliases (
+
+        -- * Combinators which create generic functions via cast
+        --
+        -- $castcombinators
+
+        -- ** Transformations
+        mkT,
+        extT,
+        -- ** Queries
+        mkQ,
+        extQ,
+        -- ** Monadic transformations
+        mkM,
+        extM,
+        -- ** MonadPlus transformations
+        mkMp,
+        extMp,
+        -- ** Readers
+        mkR,
+        extR,
+        -- ** Builders
+        extB,
+        -- ** Other
+        ext0,
+        -- * Types for generic functions
+        -- ** Transformations
+        GenericT,
+        GenericT'(..),
+        -- ** Queries
+        GenericQ,
+        GenericQ'(..),
+        -- ** Monadic transformations
+        GenericM,
+        GenericM'(..),
+        -- ** Readers
+        GenericR,
+        GenericR'(..),
+        -- ** Builders
+        GenericB,
+        GenericB'(..),
+        -- ** Other
+        Generic,
+        Generic'(..),
+
+        -- * Ingredients of generic functions
+        orElse,
+
+        -- * Function combinators on generic functions
+        recoverMp,
+        recoverQ,
+        choiceMp,
+        choiceQ,
+
+        -- * Type extension for unary type constructors
+        ext1,
+        ext1T,
+        ext1M,
+        ext1Q,
+        ext1R,
+        ext1B,
+
+        -- * Type extension for binary type constructors
+        ext2,
+        ext2T,
+        ext2M,
+        ext2Q,
+        ext2R,
+        ext2B
+
+  ) where
+
+#ifdef __HADDOCK__
+import Prelude
+#endif
+import Control.Monad
+import Data.Data
+
+------------------------------------------------------------------------------
+--
+--      Combinators to "make" generic functions
+--      We use type-safe cast in a number of ways to make generic functions.
+--
+------------------------------------------------------------------------------
+
+-- $castcombinators
+--
+-- Other programming languages sometimes provide an operator @instanceof@ which
+-- can check whether an expression is an instance of a given type. This operator
+-- allows programmers to implement a function @f :: forall a. a -> a@ which exhibits
+-- a different behaviour depending on whether a `Bool` or a `Char` is passed.
+-- In Haskell this is not the case: A function with type @forall a. a -> a@
+-- can only be the identity function or a function which loops indefinitely
+-- or throws an exception. That is, it must implement exactly the same behaviour
+-- for any type at which it is used. But sometimes it is very useful to have
+-- a function which can accept (almost) any type and exhibit a different behaviour
+-- for different types. Haskell provides this functionality with the 'Typeable'
+-- typeclass, whose instances can be automatically derived by GHC for almost all
+-- types. This typeclass allows the definition of a functon 'cast' which has type
+-- @forall a b. (Typeable a, Typeable b) => a -> Maybe b@. The 'cast' function allows
+-- to implement a polymorphic function with different behaviour at different types:
+--
+-- >>> cast True :: Maybe Bool
+-- Just True
+--
+-- >>> cast True :: Maybe Int
+-- Nothing
+--
+-- This section provides combinators which make use of 'cast' internally to
+-- provide various polymorphic functions with type-specific behaviour.
+
+
+-- | Extend the identity function with a type-specific transformation.
+-- The function created by @mkT ext@ behaves like the identity function on all
+-- arguments which cannot be cast to type @b@, and like the function @ext@ otherwise.
+-- The name 'mkT' is short for "make transformation".
+--
+-- === __Examples__
+--
+-- >>> mkT not True
+-- False
+--
+-- >>> mkT not 'a'
+-- 'a'
+--
+-- @since 0.1.0.0
+mkT :: ( Typeable a
+       , Typeable b
+       )
+    => (b -> b)
+    -- ^ The type-specific transformation
+    -> a
+    -- ^ The argument we try to cast to type @b@
+    -> a
+mkT = extT id
+
+
+-- | The function created by @mkQ def f@ returns the default result
+-- @def@ if its argument cannot be cast to type @b@, otherwise it returns
+-- the result of applying @f@ to its argument.
+-- The name 'mkQ' is short for "make query".
+--
+-- === __Examples__
+--
+-- >>> mkQ "default" (show :: Bool -> String) True
+-- "True"
+--
+-- >>> mkQ "default" (show :: Bool -> String) ()
+-- "default"
+--
+-- @since 0.1.0.0
+mkQ :: ( Typeable a
+       , Typeable b
+       )
+    => r
+    -- ^ The default result
+    -> (b -> r)
+    -- ^ The transformation to apply if the cast is successful
+    -> a
+    -- ^ The argument we try to cast to type @b@
+    -> r
+(r `mkQ` br) a = case cast a of
+                        Just b  -> br b
+                        Nothing -> r
+
+
+-- | Extend the default monadic action @pure :: Monad m => a -> m a@ by a type-specific
+-- monadic action. The function created by @mkM act@ behaves like 'pure' if its
+-- argument cannot be cast to type @b@, and like the monadic action @act@ otherwise.
+-- The name 'mkM' is short for "make monadic transformation".
+--
+-- === __Examples__
+--
+-- >>> mkM (\x -> [x, not x]) True
+-- [True,False]
+--
+-- >>> mkM (\x -> [x, not x]) (5 :: Int)
+-- [5]
+--
+-- @since 0.1.0.0
+mkM :: ( Monad m
+       , Typeable a
+       , Typeable b
+       )
+    => (b -> m b)
+    -- ^ The type-specific monadic transformation
+    -> a
+    -- ^ The argument we try to cast to type @b@
+    -> m a
+mkM = extM return
+
+-- | Extend the default 'MonadPlus' action @const mzero@ by a type-specific 'MonadPlus'
+-- action. The function created by @mkMp act@ behaves like @const mzero@ if its argument
+-- cannot be cast to type @b@, and like the monadic action @act@ otherwise.
+-- The name 'mkMp' is short for "make MonadPlus transformation".
+--
+-- === __Examples__
+--
+-- >>> mkMp (\x -> Just (not x)) True
+-- Just False
+--
+-- >>> mkMp (\x -> Just (not x)) 'a'
+-- Nothing
+--
+-- @since 0.1.0.0
+mkMp :: ( MonadPlus m
+        , Typeable a
+        , Typeable b
+        )
+     => (b -> m b)
+     -- ^ The type-specific MonadPlus action
+     -> a
+     -- ^ The argument we try to cast to type @b@
+     -> m a
+mkMp = extM (const mzero)
+
+
+-- | Make a generic reader from a type-specific case.
+-- The function created by @mkR f@ behaves like the reader @f@ if an expression
+-- of type @a@ can be cast to type @b@, and like the expression @mzero@ otherwise.
+-- The name 'mkR' is short for "make reader".
+--
+-- === __Examples__
+--
+-- >>> mkR (Just True) :: Maybe Bool
+-- Just True
+--
+-- >>> mkR (Just True) :: Maybe Int
+-- Nothing
+--
+-- @since 0.1.0.0
+mkR :: ( MonadPlus m
+       , Typeable a
+       , Typeable b
+       )
+    => m b
+    -- ^ The type-specific reader
+    -> m a
+mkR f = mzero `extR` f
+
+
+-- | Flexible type extension
+--
+-- === __Examples__
+--
+-- >>> ext0 [1 :: Int, 2, 3] [True, False] :: [Int]
+-- [1,2,3]
+--
+-- >>> ext0 [1 :: Int, 2, 3] [4 :: Int, 5, 6] :: [Int]
+-- [4,5,6]
+--
+-- @since 0.1.0.0
+ext0 :: (Typeable a, Typeable b) => c a -> c b -> c a
+ext0 def ext = maybe def id (gcast ext)
+
+
+-- | Extend a generic transformation by a type-specific transformation.
+-- The function created by @extT def ext@ behaves like the generic transformation
+-- @def@ if its argument cannot be cast to the type @b@, and like the type-specific
+-- transformation @ext@ otherwise.
+-- The name 'extT' is short for "extend transformation".
+--
+-- === __Examples__
+--
+-- >>> extT id not True
+-- False
+--
+-- >>> extT id not 'a'
+-- 'a'
+--
+-- @since 0.1.0.0
+extT :: ( Typeable a
+        , Typeable b
+        )
+     => (a -> a)
+     -- ^ The transformation we want to extend
+     -> (b -> b)
+     -- ^ The type-specific transformation
+     -> a
+     -- ^ The argument we try to cast to type @b@
+     -> a
+extT def ext = unT ((T def) `ext0` (T ext))
+
+
+-- | Extend a generic query by a type-specific query. The function created by @extQ def ext@ behaves
+-- like the generic query @def@ if its argument cannot be cast to the type @b@, and like the type-specific
+-- query @ext@ otherwise.
+-- The name 'extQ' is short for "extend query".
+--
+-- === __Examples__
+--
+-- >>> extQ (const True) not True
+-- False
+--
+-- >>> extQ (const True) not 'a'
+-- True
+--
+-- @since 0.1.0.0
+extQ :: ( Typeable a
+        , Typeable b
+        )
+     => (a -> r)
+     -- ^ The query we want to extend
+     -> (b -> r)
+     -- ^ The type-specific query
+     -> a
+     -- ^ The argument we try to cast to type @b@
+     -> r
+extQ f g a = maybe (f a) g (cast a)
+
+
+-- | Extend a generic monadic transformation by a type-specific case.
+-- The function created by @extM def ext@ behaves like the monadic transformation
+-- @def@ if its argument cannot be cast to type @b@, and like the monadic transformation
+-- @ext@ otherwise.
+-- The name 'extM' is short for "extend monadic transformation".
+--
+-- === __Examples__
+--
+-- >>> extM (\x -> [x,x])(\x -> [not x, x]) True
+-- [False,True]
+--
+-- >>> extM (\x -> [x,x])(\x -> [not x, x]) (5 :: Int)
+-- [5,5]
+--
+-- @since 0.1.0.0
+extM :: ( Monad m
+        , Typeable a
+        , Typeable b
+        )
+     => (a -> m a)
+     -- ^ The monadic transformation we want to extend
+     -> (b -> m b)
+     -- ^ The type-specific monadic transformation
+     -> a
+     -- ^ The argument we try to cast to type @b@
+     -> m a
+extM def ext = unM ((M def) `ext0` (M ext))
+
+
+-- | Extend a generic MonadPlus transformation by a type-specific case.
+-- The function created by @extMp def ext@ behaves like 'MonadPlus' transformation @def@
+-- if its argument cannot be cast to type @b@, and like the transformation @ext@ otherwise.
+-- Note that 'extMp' behaves exactly like 'extM'.
+-- The name 'extMp' is short for "extend MonadPlus transformation".
+--
+-- === __Examples__
+--
+-- >>> extMp (\x -> [x,x])(\x -> [not x, x]) True
+-- [False,True]
+--
+-- >>> extMp (\x -> [x,x])(\x -> [not x, x]) (5 :: Int)
+-- [5,5]
+--
+-- @since 0.1.0.0
+extMp :: ( MonadPlus m
+         , Typeable a
+         , Typeable b
+         )
+      => (a -> m a)
+      -- ^ The 'MonadPlus' transformation we want to extend
+      -> (b -> m b)
+      -- ^ The type-specific 'MonadPlus' transformation
+      -> a
+      -- ^ The argument we try to cast to type @b@
+      -> m a
+extMp = extM
+
+
+-- | Extend a generic builder by a type-specific case.
+-- The builder created by @extB def ext@ returns @def@ if @ext@ cannot be cast
+-- to type @a@, and like @ext@ otherwise.
+-- The name 'extB' is short for "extend builder".
+--
+-- === __Examples__
+--
+-- >>> extB True 'a'
+-- True
+--
+-- >>> extB True False
+-- False
+--
+-- @since 0.1.0.0
+extB :: ( Typeable a
+        , Typeable b
+        )
+     => a
+     -- ^ The default result
+     -> b
+     -- ^ The argument we try to cast to type @a@
+     -> a
+extB a = maybe a id . cast
+
+
+-- | Extend a generic reader by a type-specific case.
+-- The reader created by @extR def ext@ behaves like the reader @def@
+-- if expressions of type @b@ cannot be cast to type @a@, and like the
+-- reader @ext@ otherwise.
+-- The name 'extR' is short for "extend reader".
+--
+-- === __Examples__
+--
+-- >>> extR (Just True) (Just 'a')
+-- Just True
+--
+-- >>> extR (Just True) (Just False)
+-- Just False
+--
+-- @since 0.1.0.0
+extR :: ( Monad m
+        , Typeable a
+        , Typeable b
+        )
+     => m a
+     -- ^ The generic reader we want to extend
+     -> m b
+     -- ^ The type-specific reader
+     -> m a
+extR def ext = unR ((R def) `ext0` (R ext))
+
+
+
+------------------------------------------------------------------------------
+--
+--      Types for generic functions
+--
+------------------------------------------------------------------------------
+
+
+-- | Generic transformations,
+--   i.e., take an \"a\" and return an \"a\"
+--
+-- @since 0.1.0.0
+type GenericT = forall a. Data a => a -> a
+
+-- | The type synonym `GenericT` has a polymorphic type, and can therefore not
+--   appear in places where monomorphic types are expected, for example in a list.
+--   The newtype `GenericT'` wraps `GenericT` in a newtype to lift this restriction.
+--
+-- @since 0.1.0.0
+newtype GenericT' = GT { unGT :: GenericT }
+
+-- | Generic queries of type \"r\",
+--   i.e., take any \"a\" and return an \"r\"
+--
+-- @since 0.1.0.0
+type GenericQ r = forall a. Data a => a -> r
+
+-- | The type synonym `GenericQ` has a polymorphic type, and can therefore not
+--   appear in places where monomorphic types are expected, for example in a list.
+--   The newtype `GenericQ'` wraps `GenericQ` in a newtype to lift this restriction.
+--
+-- @since 0.1.0.0
+newtype GenericQ' r = GQ { unGQ :: GenericQ r }
+
+-- | Generic monadic transformations,
+--   i.e., take an \"a\" and compute an \"a\"
+--
+-- @since 0.1.0.0
+type GenericM m = forall a. Data a => a -> m a
+
+-- | The type synonym `GenericM` has a polymorphic type, and can therefore not
+--   appear in places where monomorphic types are expected, for example in a list.
+--   The newtype `GenericM'` wraps `GenericM` in a newtype to lift this restriction.
+--
+-- @since 0.1.0.0
+newtype GenericM' m = GM { unGM :: GenericM m }
+
+-- | Generic builders
+--   i.e., produce an \"a\".
+--
+-- @since 0.1.0.0
+type GenericB = forall a. Data a => a
+
+-- | The type synonym `GenericB` has a polymorphic type, and can therefore not
+--   appear in places where monomorphic types are expected, for example in a list.
+--   The data type `GenericB'` wraps `GenericB` in a data type to lift this restriction.
+--
+-- @since 0.7.3
+newtype GenericB' = GenericB' { unGenericB' :: GenericB }
+
+-- | Generic readers, say monadic builders,
+--   i.e., produce an \"a\" with the help of a monad \"m\".
+--
+-- @since 0.1.0.0
+type GenericR m = forall a. Data a => m a
+
+-- | The type synonym `GenericR` has a polymorphic type, and can therefore not
+--   appear in places where monomorphic types are expected, for example in a list.
+--   The data type `GenericR'` wraps `GenericR` in a data type to lift this restriction.
+--
+-- @since 0.7.3
+newtype GenericR' m = GenericR' { unGenericR' :: GenericR m }
+
+-- | The general scheme underlying generic functions
+--   assumed by gfoldl; there are isomorphisms such as
+--   GenericT = Generic T.
+--
+-- @since 0.1.0.0
+type Generic c = forall a. Data a => a -> c a
+
+
+-- | The type synonym `Generic` has a polymorphic type, and can therefore not
+--   appear in places where monomorphic types are expected, for example in a list.
+--   The data type `Generic'` wraps `Generic` in a data type to lift this restriction.
+--
+-- @since 0.1.0.0
+newtype Generic' c = Generic' { unGeneric' :: Generic c }
+
+------------------------------------------------------------------------------
+--
+-- Ingredients of generic functions
+--
+------------------------------------------------------------------------------
+
+-- | Left-biased choice on maybes
+--
+-- === __Examples__
+--
+-- >>> orElse Nothing Nothing
+-- Nothing
+--
+-- >>> orElse Nothing (Just 'a')
+-- Just 'a'
+--
+-- >>> orElse (Just 'a') Nothing
+-- Just 'a'
+--
+-- >>> orElse (Just 'a') (Just 'b')
+-- Just 'a'
+--
+-- @since 0.1.0.0
+orElse :: Maybe a -> Maybe a -> Maybe a
+x `orElse` y = case x of
+                 Just _  -> x
+                 Nothing -> y
+
+
+------------------------------------------------------------------------------
+--
+-- Function combinators on generic functions
+--
+------------------------------------------------------------------------------
+{-
+
+The following variations take "orElse" to the function
+level. Furthermore, we generalise from "Maybe" to any
+"MonadPlus". This makes sense for monadic transformations and
+queries. We say that the resulting combinators modell choice. We also
+provide a prime example of choice, that is, recovery from failure. In
+the case of transformations, we recover via return whereas for
+queries a given constant is returned.
+
+-}
+
+-- | Choice for monadic transformations
+--
+-- @since 0.1.0.0
+choiceMp :: MonadPlus m => GenericM m -> GenericM m -> GenericM m
+choiceMp f g x = f x `mplus` g x
+
+
+-- | Choice for monadic queries
+--
+-- @since 0.1.0.0
+choiceQ :: MonadPlus m => GenericQ (m r) -> GenericQ (m r) -> GenericQ (m r)
+choiceQ f g x = f x `mplus` g x
+
+
+-- | Recover from the failure of monadic transformation by identity
+--
+-- @since 0.1.0.0
+recoverMp :: MonadPlus m => GenericM m -> GenericM m
+recoverMp f = f `choiceMp` return
+
+
+-- | Recover from the failure of monadic query by a constant
+--
+-- @since 0.1.0.0
+recoverQ :: MonadPlus m => r -> GenericQ (m r) -> GenericQ (m r)
+recoverQ r f = f `choiceQ` const (return r)
+
+
+
+------------------------------------------------------------------------------
+--      Type extension for unary type constructors
+------------------------------------------------------------------------------
+
+#if __GLASGOW_HASKELL__ >= 707
+#define Typeable1 Typeable
+#define Typeable2 Typeable
+#endif
+
+-- | Flexible type extension
+--
+-- @since 0.3
+ext1 :: (Data a, Typeable1 t)
+     => c a
+     -> (forall d. Data d => c (t d))
+     -> c a
+ext1 def ext = maybe def id (dataCast1 ext)
+
+
+-- | Type extension of transformations for unary type constructors
+--
+-- @since 0.1.0.0
+ext1T :: (Data d, Typeable1 t)
+      => (forall e. Data e => e -> e)
+      -> (forall f. Data f => t f -> t f)
+      -> d -> d
+ext1T def ext = unT ((T def) `ext1` (T ext))
+
+
+-- | Type extension of monadic transformations for type constructors
+--
+-- @since 0.1.0.0
+ext1M :: (Monad m, Data d, Typeable1 t)
+      => (forall e. Data e => e -> m e)
+      -> (forall f. Data f => t f -> m (t f))
+      -> d -> m d
+ext1M def ext = unM ((M def) `ext1` (M ext))
+
+
+-- | Type extension of queries for type constructors
+--
+-- @since 0.1.0.0
+ext1Q :: (Data d, Typeable1 t)
+      => (d -> q)
+      -> (forall e. Data e => t e -> q)
+      -> d -> q
+ext1Q def ext = unQ ((Q def) `ext1` (Q ext))
+
+
+-- | Type extension of readers for type constructors
+--
+-- @since 0.1.0.0
+ext1R :: (Monad m, Data d, Typeable1 t)
+      => m d
+      -> (forall e. Data e => m (t e))
+      -> m d
+ext1R def ext = unR ((R def) `ext1` (R ext))
+
+
+-- | Type extension of builders for type constructors
+--
+-- @since 0.2
+ext1B :: (Data a, Typeable1 t)
+      => a
+      -> (forall b. Data b => (t b))
+      -> a
+ext1B def ext = unB ((B def) `ext1` (B ext))
+
+------------------------------------------------------------------------------
+--      Type extension for binary type constructors
+------------------------------------------------------------------------------
+
+-- | Flexible type extension
+ext2 :: (Data a, Typeable2 t)
+     => c a
+     -> (forall d1 d2. (Data d1, Data d2) => c (t d1 d2))
+     -> c a
+ext2 def ext = maybe def id (dataCast2 ext)
+
+
+-- | Type extension of transformations for unary type constructors
+--
+-- @since 0.3
+ext2T :: (Data d, Typeable2 t)
+      => (forall e. Data e => e -> e)
+      -> (forall d1 d2. (Data d1, Data d2) => t d1 d2 -> t d1 d2)
+      -> d -> d
+ext2T def ext = unT ((T def) `ext2` (T ext))
+
+
+-- | Type extension of monadic transformations for type constructors
+--
+-- @since 0.3
+ext2M :: (Monad m, Data d, Typeable2 t)
+      => (forall e. Data e => e -> m e)
+      -> (forall d1 d2. (Data d1, Data d2) => t d1 d2 -> m (t d1 d2))
+      -> d -> m d
+ext2M def ext = unM ((M def) `ext2` (M ext))
+
+
+-- | Type extension of queries for type constructors
+--
+-- @since 0.3
+ext2Q :: (Data d, Typeable2 t)
+      => (d -> q)
+      -> (forall d1 d2. (Data d1, Data d2) => t d1 d2 -> q)
+      -> d -> q
+ext2Q def ext = unQ ((Q def) `ext2` (Q ext))
+
+
+-- | Type extension of readers for type constructors
+--
+-- @since 0.3
+ext2R :: (Monad m, Data d, Typeable2 t)
+      => m d
+      -> (forall d1 d2. (Data d1, Data d2) => m (t d1 d2))
+      -> m d
+ext2R def ext = unR ((R def) `ext2` (R ext))
+
+
+-- | Type extension of builders for type constructors
+--
+-- @since 0.3
+ext2B :: (Data a, Typeable2 t)
+      => a
+      -> (forall d1 d2. (Data d1, Data d2) => (t d1 d2))
+      -> a
+ext2B def ext = unB ((B def) `ext2` (B ext))
+
+------------------------------------------------------------------------------
+--
+--      Type constructors for type-level lambdas
+--
+------------------------------------------------------------------------------
+
+
+-- | The type constructor for transformations
+newtype T x = T { unT :: x -> x }
+
+-- | The type constructor for transformations
+newtype M m x = M { unM :: x -> m x }
+
+-- | The type constructor for queries
+newtype Q q x = Q { unQ :: x -> q }
+
+-- | The type constructor for readers
+newtype R m x = R { unR :: m x }
+
+-- | The type constructor for builders
+newtype B x = B {unB :: x}
diff --git a/src/Internal/LLM.hs b/src/Internal/LLM.hs
new file mode 100644
--- /dev/null
+++ b/src/Internal/LLM.hs
@@ -0,0 +1,191 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+
+--------------------------------------------------------------------------------
+
+module Internal.LLM
+  ( UUID (..)
+  , Root (..)
+  , Filter (..)
+  , Mode (..)
+  , Chit (..)
+  , Chat
+  , History (..)
+  , Mask (..)
+  , File (..)
+  , Files (..)
+  , FileLine
+  , FilePaths (..)
+  , AbsoluteFilePath (..)
+  , Template (..)
+  , modes
+  , tpl2xmls
+  )
+where
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+newtype UUID = UUID String
+
+newtype Root = Root FilePath deriving Eq
+
+newtype Filter = Filter String
+
+data Mode
+  = Auto
+  | Chat
+  | Code
+  | Docs
+  | Echo
+  | Plan
+  | Test
+  deriving (Bounded, Enum, Eq, Read, Show)
+
+data Chit =
+  Chit
+    { prev :: ![String]
+    , next :: ![String]
+    }
+
+type Chat = [String]
+
+data History =
+  History
+    { chit :: !Chit
+    , chat :: !Chat
+    }
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+newtype Mask = Mask [String]
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+type Markdown = String
+
+type FileLine = String
+
+newtype File = File (FilePath, [FileLine])
+
+--------------------------------------------------------------------------------
+
+newtype Files = Files [File]
+
+instance Semigroup Files where
+  Files xs <> Files ys =
+    Files (xs ++ ys)
+
+instance Monoid Files where
+  mempty = Files []
+
+--------------------------------------------------------------------------------
+
+newtype AbsoluteFilePath = AbsoluteFilePath FilePath
+
+--------------------------------------------------------------------------------
+
+-- NOTE: Then use `mconcat` to combine
+
+data FilePaths = FilePaths { filePaths :: [FilePath] }
+
+instance Semigroup FilePaths where
+  FilePaths xs <> FilePaths ys =
+    FilePaths (xs ++ ys)
+
+instance Monoid FilePaths where
+  mempty = FilePaths []
+
+--------------------------------------------------------------------------------
+
+data Template =
+  Template
+    { purpose      :: !String
+    , instructions :: ![String]
+    , examples     :: ![Markdown]
+    , files        :: ![File]
+    }
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+modes :: [Mode]
+modes =
+ [ minBound .. maxBound ]
+
+tpl2xmls
+  :: Template
+  -> [String]
+tpl2xmls tpl =
+  [ ( if eis && ees && efs then
+        pur
+      else
+        "<purpose>" ++ pur ++ "</purpose>"
+    ) ++
+    ( if eis then
+        []
+      else
+        "<instructions>" ++
+        tis ++
+        "</instructions>"
+    ) ++
+    ( if ees then
+        []
+      else
+        "<examples>" ++
+        tes ++
+        "</examples>"
+    ) ++
+    ( if efs then
+        []
+      else
+        "<files>" ++
+        concatMap aux tfs ++
+        "</files>"
+    )
+  ]
+  where
+    pur =
+      purpose tpl ++
+      ( if eis then
+          []
+        else
+          ". Follow the specified `instructions`"
+      ) ++
+      ( if ees then
+          []
+        else
+          ". Output MUST match scaffolding from provided `examples`"
+      ) ++
+      ( if efs then
+          []
+        else
+          ". Apply to each of the `files`"
+      )
+    eis = null tis
+    ees = null tes
+    efs = null tfs
+    tis =
+      concatMap (\ x -> "<instruction>" ++ x ++ "</instruction>")
+      $ instructions tpl
+    tes =
+      concatMap (\ x -> "<example>" ++ x ++ "</example>")
+      $ examples tpl
+    tfs = zip [0 :: Int ..] $ files tpl
+    aux (i, File (src, ls)) =
+      "<file index=\"" ++ show i ++ "\">" ++
+      "<source>" ++ src ++ "</source>" ++
+      "<content>" ++ unlines ls ++ "</content>" ++
+      "</file>"
diff --git a/src/Internal/LLM/Action.hs b/src/Internal/LLM/Action.hs
new file mode 100644
--- /dev/null
+++ b/src/Internal/LLM/Action.hs
@@ -0,0 +1,48 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+
+--------------------------------------------------------------------------------
+
+module Internal.LLM.Action
+  ( Action (..)
+  , TextToFile
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import qualified Internal.LLM      as INT
+
+import qualified Agent.LLM.Message as MSG
+
+--------------------------------------------------------------------------------
+
+type TextToFile = String -> [(FilePath, [INT.FileLine])]
+
+data Action
+  = None
+  | Branch !String !INT.Files
+  | Exit
+  | Drop
+  | File !INT.File
+  | Help
+  | Hist !(Bool, Bool)
+  | Message !MSG.Message
+  | Mode  !Char !String
+  | Paths !INT.FilePaths
+  | Pile
+  | Prompt !String
+  | Ruck !String
+  | Template !TextToFile ![INT.File] ![INT.File] ![INT.File]
+  | UnknownCmd !String
+  | Wipe
diff --git a/src/Internal/RIO.hs b/src/Internal/RIO.hs
new file mode 100644
--- /dev/null
+++ b/src/Internal/RIO.hs
@@ -0,0 +1,1627 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+{-# LANGUAGE FlexibleContexts             #-}
+{-# LANGUAGE UndecidableInstances         #-}
+
+{-# LANGUAGE LambdaCase                   #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+--
+-- Safe {H}askell
+--
+-- https://simonmar.github.io/bib/safe-haskell-2012_abstract.html
+--
+-- (David Terei, David Mazières, Simon Marlow, Simon Peyton Jones) Haskell ’12:
+-- Proceedings of the Fifth ACM SIGPLAN Symposium on Haskell, Copenhagen,
+-- Denmark, ACM, 2012
+--
+-- Though Haskell is predominantly type-safe, implementations contain a few
+-- loopholes through which code can bypass typing and module encapsulation. This
+-- paper presents Safe Haskell, a language extension that closes these
+-- loopholes. Safe Haskell makes it possible to confine and safely execute
+-- untrusted, possibly malicious code. By strictly enforcing types, Safe Haskell
+-- allows a variety of different policies from API sandboxing to
+-- information-flow control to be implemented easily as monads. Safe Haskell is
+-- aimed to be as unobtrusive as possible. It enforces properties that
+-- programmers tend to meet already by convention. We describe the design of
+-- Safe Haskell and an implementation (currently shipping with GHC) that infers
+-- safety for code that lies in a safe subset of the language. We use Safe
+-- Haskell to implement an online Haskell interpreter that can securely execute
+-- arbitrary untrusted code with no overhead. The use of Safe Haskell greatly
+-- simplifies this task and allows the use of a large body of existing code and
+-- tools.
+
+--------------------------------------------------------------------------------
+
+module Internal.RIO
+  ( RIO ()
+  , run
+    -- * Environment
+  , getEnvVar
+    -- * Read/Print
+  , input
+  , output
+    -- * LLM (Config)
+  , llmPathCWD
+    -- * LLM (Chat)
+  , llmChatKey, llmChatAPI
+  , llmChatWeb
+    -- * LLM (Code)
+  , llmCodeDir
+  , llmCodeMsk
+  , llmCodeIns, llmCodeExa
+  , llmCodeSeq, llmCodeGet, llmCodeGit
+  , llmCodePut
+  , llmCodeKey, llmCodeAPI
+  , llmCodeWeb
+    -- * LLM (Plan)
+  , llmPlanDir
+  , llmPlanMsk
+  , llmPlanSeq, llmPlanGet
+  , llmPlanKey, llmPlanAPI
+  , llmPlanWeb
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import           Control.Exception        ( SomeException, try )
+import           Data.Char                ( isDigit )
+import           Data.Either              ( fromLeft, partitionEithers )
+import           Data.List                ( isPrefixOf )
+import           Data.Maybe               ( maybeToList )
+import qualified System.Environment.Blank as ENV
+import           System.Exit
+  ( ExitCode (ExitFailure, ExitSuccess)
+  )
+import           System.IO
+  ( hClose
+  , hFlush
+  , hGetContents
+  , hPutStrLn
+  , hReady
+  , stdin
+  , stdout
+  )
+import           System.Process
+  ( CreateProcess (cwd, std_err, std_in, std_out)
+  , StdStream (CreatePipe)
+  , createProcess
+  , proc
+  , readCreateProcessWithExitCode
+  , readProcessWithExitCode
+  , waitForProcess
+  )
+import           Text.Read                ( readMaybe )
+
+import qualified Internal.LLM             as LLM
+import qualified Internal.Utils           as UTL
+
+import qualified Agent.IO.Effects         as EFF
+
+--------------------------------------------------------------------------------
+
+newtype RIO a = RestrictedIO { run :: IO a }
+
+instance Functor RIO where
+  fmap f m = RestrictedIO $      f <$> run m
+
+instance Applicative RIO where
+  pure      = RestrictedIO . pure
+  (<*>) f m = RestrictedIO $ run f <*> run m
+
+instance Monad RIO where
+  (>>=) m f = RestrictedIO $ run m >>= run . f
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+data Position =
+  Position !Int !Int
+  deriving (Eq, Show)
+
+instance Ord Position where
+  (<=) (Position y1 x1) (Position y2 x2) =
+    case compare y1 y2 of
+      GT -> False
+      EQ -> x1 <= x2
+      LT -> True
+
+instance Read Position where
+  readsPrec _ str =
+    -- NOTE:
+    -- "\^[[#;#R" => "\^[" and "[#;#R" (only parse last)
+    maybeToList
+    ( readMaybe (f str) >>= \ y ->
+      readMaybe (g str) >>= \ x ->
+        Just
+          ( Position y x
+          , h str
+          )
+    )
+    where
+      f = takeWhile (/= ';') . drop 1 . dropWhile (/= '[')
+      g = takeWhile (/= 'R') . drop 1 . dropWhile (/= ';')
+      h = drop 1 . dropWhile (/= 'R') . dropWhile (/= ';') . dropWhile (/= '[')
+
+--------------------------------------------------------------------------------
+
+data MultiLine =
+  MultiLine
+    { stx :: !(Maybe Position)
+    , cur :: !(Maybe Position)
+    , etx :: !(Maybe Position)
+    , col :: !Int
+    }
+  deriving Show
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+class StdIn m where
+  input
+    :: [ String ]
+    -> [ String ]
+    -> m String
+
+class StdOut m where
+  output
+    :: String
+    -> m ()
+
+--------------------------------------------------------------------------------
+
+instance StdIn RIO where
+  input prev next =
+    -- NOTE: "\^[7" - save cursor position (SCO)
+    -- - https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797#cursor-controls
+    RestrictedIO $ putStr "\^[7" >> aux gen prev next [] []
+    where
+      msv = 32767 :: Int
+      gen =
+        MultiLine
+          { stx = Nothing
+          , cur = Nothing
+          , etx = Nothing
+          , col = 0
+          }
+      aux mlp hps hns bcs acs =
+        block >>= \ blk ->
+        case (blk < ['\32'], blk) of
+          -- NOTE: To view keystrokes, use: `ghc -e getLine` (hit + ENTER) and
+          -- then map to ASCII control codes (use Caret notation cos Λ prefix):
+          --
+          -- - https://en.wikipedia.org/wiki/ASCII#Control_code_table
+          (True , ['\^J'])                     -> caseEnter
+          (True , ['\^H'])                     -> caseBackspace
+          (True , ['\^[','[','3','~'])         -> caseDelete
+          (True , ['\^D'])                     -> caseDelete
+          (True , ['\^[','[','H'])             -> caseHome
+          (True , ['\^A'])                     -> caseHome
+          (True , ['\^[','[','F'])             -> caseEnd
+          (True , ['\^E'])                     -> caseEnd
+          (True , ['\^L'])                     -> caseWipe
+          (True , ['\^U'])                     -> caseWipeStart
+          (True , ['\^K'])                     -> caseWipeEnd
+          (True , ['\^[','[','A'])             -> caseArrowUp
+          (True , ['\^[','[','B'])             -> caseArrowDown
+          (True , ['\^[','[','C'])             -> caseArrowRight blk
+          (True , ['\^[','[','D'])             -> caseArrowLeft  blk
+          (True , ['\^[','[','1',';','5','C']) -> caseArrowCtrlRight
+          (True , ['\^[','[','1',';','5','D']) -> caseArrowCtrlLeft
+          (True , '\^[':ps)                    -> casePositions ps
+          (True , _)                           -> caseSkip
+          (False, ['\DEL'])                    -> caseSkip
+          (False, _)                           -> caseText blk
+          where
+            caseEnter =
+              -- NOTE: ENTER (line feed) only if something is typed
+              case (bcs, acs) of
+                ([], []) ->
+                  aux mlp hps hns bcs acs
+                ________ ->
+                  hFlush stdout >>
+                  -- NOTE: Move to end of text
+                  putStr hom    >>
+                  hFlush stdout >>
+                  (pure . (++ acs) . reverse) bcs
+                  where
+                    hom =
+                      case mlp of
+                        MultiLine { etx = Just (Position y x) } ->
+                          "\^[[" ++ show y ++ ";" ++ show x ++ "H"
+                        _______________________________________ ->
+                          []
+            caseBackspace =
+              -- NOTE: BACKSPACE / CTRL + H (remove char if any and re-write
+              -- after chars)
+              case bcs of
+                [    ] -> aux mlp hps hns bcs acs
+                (_:cs) ->
+                  hFlush stdout >>
+                  -- NOTE: 0) Print "\^[[6n" position before action
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: Remove char
+                  putChar '\^H'                      >>
+                  -- NOTE: Save position
+                  putStr "\^[7"                      >>
+                  -- NOTE: Clear rest of screen from position
+                  putStr "\^[[0J"                    >>
+                  -- NOTE: Print after chars
+                  putStr  acs                        >>
+                  -- NOTE: 1) Print "\^[[6n" end position after action
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: 2) Print "\^[[6n" column witdh
+                  putStr ("\^[[" ++ show msv ++ "C") >>
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: Go back to saved position
+                  putStr "\^[8"                      >>
+                  -- NOTE: 3) Print "\^[[6n" current position after action
+                  putStr "\^[[6n"                    >>
+                  hFlush stdout                      >>
+                  aux mlp hps hns cs acs
+            caseDelete =
+              -- NOTE: DELETE / CTRL + D behave as delete key
+              case acs of
+                -- NOTE: Delete (remove char if any and re-write after chars)
+                [    ] -> aux mlp hps hns bcs acs
+                (_:cs) ->
+                  hFlush stdout                      >>
+                  -- NOTE: 0) Print "\^[[6n" position before action
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: Save position
+                  putStr "\^[7"                      >>
+                  -- NOTE: Clear rest of screen from position
+                  putStr "\^[[0J"                    >>
+                  -- NOTE: Print after chars
+                  putStr  cs                         >>
+                  -- NOTE: 1) Print "\^[[6n" end position after action
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: 2) Print "\^[[6n" column witdh
+                  putStr ("\^[[" ++ show msv ++ "C") >>
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: Go back to saved position
+                  putStr "\^[8"                      >>
+                  -- NOTE: 3) Print "\^[[6n" current position after action
+                  putStr "\^[[6n"                    >>
+                  hFlush stdout                      >>
+                  aux mlp hps hns bcs cs
+            caseHome =
+              -- NOTE: HOME / CTRL + A to move to start of text
+              hFlush stdout >>
+              putStr hom    >>
+              hFlush stdout >>
+              aux mln hps hns [] (reverse bcs ++ acs)
+              where
+                (mln, hom) =
+                  case mlp of
+                    MultiLine { stx = Just (Position y x) } ->
+                      ( mlp { cur = Just (Position y x) }
+                      , "\^[[" ++ show y ++ ";" ++ show x ++ "H"
+                      )
+                    _______________________________________ ->
+                      ( mlp
+                      , "\^[8"
+                      )
+            caseEnd =
+              -- NOTE: END / CTRL + E to move to end of text
+              hFlush stdout >>
+              putStr hom    >>
+              hFlush stdout >>
+              aux mln hps hns ((++ bcs) $ reverse acs) []
+              where
+                (mln, hom) =
+                  case mlp of
+                    MultiLine { etx = Just (Position y x) } ->
+                      ( mlp { cur = Just (Position y x) }
+                      , "\^[[" ++ show y ++ ";" ++ show x ++ "H"
+                      )
+                    _______________________________________ ->
+                      ( mlp
+                      , []
+                      )
+            caseWipe =
+              -- NOTE: CTRL + L (form feed) becomes "/w" (clear screen)
+              pure "/wipe"
+            caseWipeStart =
+              -- NOTE: CTRL + U cut text to start
+              hFlush stdout                      >>
+              -- NOTE: 0) Print "\^[[6n" position before action
+              putStr "\^[[6n"                    >>
+              -- NOTE: Go back to start of line
+              putStr hom                         >>
+              -- NOTE: Save position
+              putStr "\^[7"                      >>
+              -- NOTE: Clear rest of screen from position
+              putStr "\^[[0J"                    >>
+              -- NOTE: Print after chars
+              putStr  acs                        >>
+              -- NOTE: 1) Print "\^[[6n" end position after action
+              putStr "\^[[6n"                    >>
+              -- NOTE: 2) Print "\^[[6n" column witdh
+              putStr ("\^[[" ++ show msv ++ "C") >>
+              putStr "\^[[6n"                    >>
+              -- NOTE: Go back to saved position
+              putStr "\^[8"                      >>
+              -- NOTE: 3) Print "\^[[6n" current position after action
+              putStr "\^[[6n"                    >>
+              hFlush stdout                      >>
+              aux mlp hps hns [] acs
+              where
+                hom =
+                  case mlp of
+                    MultiLine { stx = Just (Position y x) } ->
+                      "\^[[" ++ show y ++ ";" ++ show x ++ "H"
+                    _______________________________________ ->
+                      "\^[8"
+            caseWipeEnd =
+              -- NOTE: CTRL + K cut text to end
+              hFlush stdout                      >>
+              -- NOTE: 0) Print "\^[[6n" position before action
+              putStr "\^[[6n"                    >>
+              -- NOTE: Save position
+              putStr "\^[7"                      >>
+              -- NOTE: Clear rest of screen from position
+              putStr "\^[[0J"                    >>
+              -- NOTE: 1) Print "\^[[6n" end position after action
+              putStr "\^[[6n"                    >>
+              -- NOTE: 2) Print "\^[[6n" column witdh
+              putStr ("\^[[" ++ show msv ++ "C") >>
+              putStr "\^[[6n"                    >>
+              -- NOTE: Go back to saved position
+              putStr "\^[8"                      >>
+              -- NOTE: 3) Print "\^[[6n" current position after action
+              putStr "\^[[6n"                    >>
+              hFlush stdout                      >>
+              aux mlp hps hns bcs []
+            caseArrowUp =
+              -- NOTE: Allowed escaped sequences: Arrow "↑"
+              case (hps, hns) of
+                ([  ], _) -> aux mlp hps hns bcs acs
+                (p:ps, _) ->
+                  hFlush stdout >>
+                  -- NOTE: 0) Print "\^[[6n" position before action
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: Move to start of text
+                  putStr hom                         >>
+                  -- NOTE: Print previous line
+                  putStr p                           >>
+                  -- NOTE: Save position
+                  putStr "\^[7"                      >>
+                  -- NOTE: Clear rest of screen from position
+                  putStr "\^[[0J"                    >>
+                  -- NOTE: Print after chars
+                  putStr  []                         >>
+                  -- NOTE: 1) Print "\^[[6n" end position after action
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: 2) Print "\^[[6n" column witdh
+                  putStr ("\^[[" ++ show msv ++ "C") >>
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: Go back to saved position
+                  putStr "\^[8"                      >>
+                  -- NOTE: 3) Print "\^[[6n" current position after action
+                  putStr "\^[[6n"                    >>
+                  hFlush stdout                      >>
+                  aux mlp ps (p:hns) rev []
+                  where
+                    rev = reverse p
+                    hom =
+                      case mlp of
+                        MultiLine { stx = Just (Position y x) } ->
+                          "\^[[" ++ show y ++ ";" ++ show x ++ "H"
+                        _______________________________________ ->
+                          "\^[8"
+            caseArrowDown =
+              -- NOTE: Allowed escaped sequences: Arrow "↓"
+              case (hps, hns) of
+                (_, [  ]) -> aux mlp hps hns bcs acs
+                (_, p:ps) ->
+                  hFlush stdout >>
+                  -- NOTE: 0) Print "\^[[6n" position before action
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: Move to start of text
+                  putStr hom                         >>
+                  -- NOTE: Print previous line
+                  putStr p                           >>
+                  -- NOTE: Save position
+                  putStr "\^[7"                      >>
+                  -- NOTE: Clear rest of screen from position
+                  putStr "\^[[0J"                    >>
+                  -- NOTE: Print after chars
+                  putStr  []                         >>
+                  -- NOTE: 1) Print "\^[[6n" end position after action
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: 2) Print "\^[[6n" column witdh
+                  putStr ("\^[[" ++ show msv ++ "C") >>
+                  putStr "\^[[6n"                    >>
+                  -- NOTE: Go back to saved position
+                  putStr "\^[8"                      >>
+                  -- NOTE: 3) Print "\^[[6n" current position after action
+                  putStr "\^[[6n"                    >>
+                  hFlush stdout                      >>
+                  aux mlp (p:hps) ps rev []
+                  where
+                    rev = reverse p
+                    hom =
+                      case mlp of
+                        MultiLine { stx = Just (Position y x) } ->
+                          "\^[[" ++ show y ++ ";" ++ show x ++ "H"
+                        _______________________________________ ->
+                          "\^[8"
+            caseArrowRight str =
+              -- NOTE: Allowed escaped sequences: Arrow "→"
+              case (bcs, acs) of
+                (_, [  ]) ->
+                  aux mlp hps hns    bcs  acs
+                (_, c:cs) ->
+                  hFlush stdout   >>
+                  ( if pl then
+                      putStr ("\^[[" ++ "1" ++ "E")
+                    else
+                      putStr str
+                  ) >>
+                  -- NOTE: Update current position
+                  putStr "\^[[6n" >>
+                  hFlush stdout   >>
+                  aux mlp hps hns (c:bcs) cs
+                  where
+                    pl =
+                      case mlp of
+                        MultiLine
+                          { cur = Just (Position cy cx)
+                          , etx = Just (Position ey __)
+                          , col = cw
+                          } -> cy <= ey && cx == cw
+                        ___ -> False
+            caseArrowLeft str =
+              -- NOTE: Allowed escaped sequences: Arrow "←"
+              case (bcs, acs) of
+                ([  ], _) ->
+                  aux mlp hps hns bcs    acs
+                (c:cs, _) ->
+                  hFlush stdout >>
+                  ( if pl then
+                      putStr ("\^[[" ++      "1" ++ "F") >>
+                      putStr ("\^[[" ++ show msv ++ "C")
+                    else
+                      putStr str
+                  ) >>
+                  -- NOTE: Update current position
+                  putStr "\^[[6n" >>
+                  hFlush stdout >>
+                  aux mlp hps hns  cs (c:acs)
+                  where
+                    pl =
+                      case mlp of
+                        MultiLine
+                          { stx = Just (Position sy __)
+                          , cur = Just (Position cy 01)
+                          } -> sy < cy
+                        ___ -> False
+            caseArrowCtrlRight =
+              -- NOTE: Allowed escaped sequences: CTRL + Arrow "→"
+              -- NOTE: Move to end of text
+              hFlush stdout   >>
+              putStr np       >>
+              -- NOTE: Update current position
+              putStr "\^[[6n" >>
+              hFlush stdout   >>
+              aux mlp hps hns (ts ++ bcs) ds
+              where
+                ds = dropWhile (== ' ') $ dropWhile (/= ' ') acs
+                ts = drop (length ds) $ reverse acs
+                lc = length ts
+                np =
+                  case mlp of
+                    MultiLine
+                      { cur = Just (Position cy cx)
+                      , etx = Just (Position ey _ )
+                      , col = cw
+                      } ->
+                      case (cy < ey, compare (cw - cx) lc) of
+                        (True, LT) ->
+                          "\^[[" ++ show y ++ ";" ++ show x ++ "H"
+                          where
+                            y = cy + 1
+                            x = lc - (cw - cx)
+                        __________ ->
+                          "\^[[" ++ show y ++ ";" ++ show x ++ "H"
+                          where
+                            y = cy
+                            x = cx + lc
+                    ___ -> []
+            caseArrowCtrlLeft =
+              -- NOTE: Allowed escaped sequences: CTRL + Arrow "←"
+              hFlush stdout   >>
+              putStr np       >>
+              -- NOTE: Update current position
+              putStr "\^[[6n" >>
+              hFlush stdout   >>
+              aux mlp hps hns ds (ts ++ acs)
+              where
+                ds = dropWhile (== ' ') $ dropWhile (/= ' ') bcs
+                ts = drop (length ds) $ reverse bcs
+                lc = length ts
+                np =
+                  case mlp of
+                    MultiLine
+                      { stx = Just (Position sy _ )
+                      , cur = Just (Position cy cx)
+                      , col = cw
+                      } ->
+                      case (sy < cy, compare cx lc) of
+                        (True, LT) ->
+                          "\^[[" ++ show y ++ ";" ++ show x ++ "H"
+                          where
+                            y = cy - 1
+                            x = cw - (lc - cx)
+                        __________ ->
+                          "\^[[" ++ show y ++ ";" ++ show x ++ "H"
+                          where
+                            y = cy
+                            x = cx - lc
+                    ___ -> []
+            casePositions ps =
+              -- NOTE: Other escaped sequences (skip unless positions)
+              aux mln hps hns bcs acs
+              where
+                ops = map readMaybe $ UTL.split '\^[' ps :: [Maybe Position]
+                mln =
+                  -- NOTE: 0) Print "\^[[6n" position before action (unused)
+                  -- NOTE: 1) Print "\^[[6n" end position after action
+                  -- NOTE: 2) Print "\^[[6n" column witdh
+                  -- NOTE: 3) Print "\^[[6n" current position after action
+                  case (mlp, ops) of
+                    (___________________________,
+                     [                                           ]) ->
+                      mlp
+                    (MultiLine { stx = Nothing },
+                     [Just (Position y x)                        ]) ->
+                      mlp
+                        { stx = Just sp
+                        , cur = Just sp
+                        , etx = Just sp
+                        , col = x
+                        }
+                      where
+                        sp = Position y x
+                    (MultiLine { etx = Just ep },
+                     [Just cp                                    ]) ->
+                      if cp > ep then
+                        mlp
+                          { cur = Just cp
+                          , etx = Just cp
+                          }
+                      else
+                        mlp
+                          { cur = Just cp
+                          }
+                    (MultiLine { stx = Nothing },
+                     [Just sp,Just ep,Just (Position _ w),Just cp]) ->
+                      mlp
+                        { stx = Just sp
+                        , cur = Just cp
+                        , etx = Just ep
+                        , col = w
+                        }
+                    (___________________________,
+                     [Just __,Just ep,Just (Position _ w),Just cp]) ->
+                      mlp
+                        { cur = Just cp
+                        , etx = Just ep
+                        , col = w
+                        }
+                    _______________________________________________ ->
+                      mlp
+            caseSkip =
+              aux mlp hps hns bcs acs
+            caseText str =
+              hFlush stdout                      >>
+              -- NOTE: 0) Print "\^[[6n" position before action
+              putStr "\^[[6n"                    >>
+              -- NOTE: Type key or text
+              putStr str                         >>
+              -- NOTE: Save position
+              putStr "\^[7"                      >>
+              -- NOTE: Clear rest of screen from position
+              putStr "\^[[0J"                    >>
+              -- NOTE: Print after chars
+              putStr  acs                        >>
+              -- NOTE: 1) Print "\^[[6n" end position after action
+              putStr "\^[[6n"                    >>
+              -- NOTE: 2) Print "\^[[6n" column witdh
+              putStr ("\^[[" ++ show msv ++ "C") >>
+              putStr "\^[[6n"                    >>
+              -- NOTE: Go back to saved position
+              putStr "\^[8"                      >>
+              -- NOTE: 3) Print "\^[[6n" current position after action
+              putStr "\^[[6n"                    >>
+              hFlush stdout                      >>
+              aux mlp hps hns (reverse str ++ bcs) acs
+      block =
+        -- NOTE: https://stackoverflow.com/a/38553473
+        --
+        -- We refactored and named it `block` instead of `key` as it is possible
+        -- to paste a huge block of text. Calling that a keystroke, doesn't seem
+        -- appropiate
+        reverse <$> nxt []
+        where
+          nxt cs =
+            do
+              c <- getChar
+              m <- hReady stdin
+              (if m then nxt else pure) (c:cs)
+
+instance StdOut RIO where
+  output x = RestrictedIO $
+    putStr x >> hFlush stdout
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+class
+  EFF.LlmConf m
+  => LlmConf m
+  where
+    llmPathCWD
+      :: m (Maybe LLM.Root)
+
+instance
+  EFF.LlmConf RIO
+  => LlmConf RIO
+  where
+    llmPathCWD =
+      ( \ case
+          Just rp -> Just $ LLM.Root rp
+          Nothing -> Nothing
+      )
+      <$> getEnvVar "LLM_PATH_CWD"
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+class
+  EFF.LlmChatConf m
+  => LlmChatConf m
+  where
+    llmChatAPI
+      :: m (Maybe String)
+    llmChatKey
+      :: m (Maybe String)
+
+instance
+  EFF.LlmChatConf RIO
+  => LlmChatConf RIO
+  where
+    llmChatAPI = getEnvVar "LLM_CHAT_LOCALHOST_API"
+    llmChatKey = pure Nothing
+
+--------------------------------------------------------------------------------
+
+class
+  EFF.LlmChatConf m
+  => LlmChatPost m
+  where
+    llmChatWeb
+      :: String -> m (Either String String)
+
+instance
+  EFF.LlmChatConf RIO
+  => LlmChatPost RIO
+  where
+    llmChatWeb json =
+      EFF.llmChatAPI >>= \ mapi ->
+      EFF.llmChatKey >>= \ mkey ->
+      llmCurl json mapi mkey
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+class
+  EFF.LlmConf m
+  => LlmCodeRoot m
+  where
+    llmCodeDir
+      :: m String
+
+instance
+  ( EFF.LlmConf     RIO
+  , EFF.LlmCodeRoot RIO
+  )
+  => LlmCodeRoot RIO
+  where
+    llmCodeDir = pure "src"
+
+--------------------------------------------------------------------------------
+
+class
+  EFF.LlmCodeMask m
+  => LlmCodeMask m
+  where
+    llmCodeMsk
+      :: m [String]
+
+instance
+  ( EFF.LlmConf     RIO
+  , EFF.LlmCodeMask RIO
+  )
+  => LlmCodeMask RIO
+  where
+    llmCodeMsk = pure [ "*.hs" ]
+
+--------------------------------------------------------------------------------
+
+class
+  EFF.LlmCodeTmpl m
+  => LlmCodeTmpl m
+  where
+    llmCodeIns
+      :: m [LLM.File]
+    llmCodeExa
+      :: m [LLM.File]
+
+instance
+  ( EFF.LlmConf     RIO
+  , EFF.LlmCodeTmpl RIO
+  )
+  => LlmCodeTmpl RIO
+  where
+    llmCodeIns =
+      EFF.llmPathCWD >>= \ ocwd ->
+      case ocwd of
+        Just (LLM.Root root) ->
+          realPath (root ++ "llm") >>= \ efap ->
+          case efap of
+            -- TODO: DRY
+            Right fap ->
+              findFiles fap "*code_instructions_*.json" >>= \ eafps ->
+              case eafps of
+                Right afps ->
+                  mapM
+                  ( \ abspath ->
+                      LLM.File . (,) abspath . lines
+                      <$> readFileStrict abspath
+                  ) afps
+                Left  __ ->
+                  pure []
+            Left ____ ->
+              pure []
+        Nothing ->
+          pure []
+
+    llmCodeExa =
+      EFF.llmPathCWD >>= \ ocwd ->
+      case ocwd of
+        Just (LLM.Root root) ->
+          realPath (root ++ "llm") >>= \ efap ->
+          case efap of
+            -- TODO: DRY
+            Right fap ->
+              findFiles fap "*code_examples_*.md" >>= \ eafps ->
+              case eafps of
+                Right afps ->
+                  mapM
+                  ( \ abspath ->
+                      LLM.File . (,) abspath . lines
+                      <$> readFileStrict abspath
+                  ) afps
+                Left  __ ->
+                  pure []
+            Left ____ ->
+              pure []
+        Nothing ->
+          pure []
+
+--------------------------------------------------------------------------------
+
+class
+  ( EFF.LlmConf     m
+  , EFF.LlmCodeRoot m
+  , EFF.LlmCodeMask m
+  )
+  => LlmCodeRead m
+  where
+    llmCodeSeq
+      :: Maybe LLM.Filter
+      -> m (Either [String] LLM.FilePaths)
+    llmCodeGet
+      :: LLM.AbsoluteFilePath
+      -> m (Either String LLM.File)
+    llmCodeGit
+      :: m (Either String String)
+
+instance
+  ( EFF.LlmConf     RIO
+  , EFF.LlmCodeRoot RIO
+  , EFF.LlmCodeMask RIO
+  )
+  => LlmCodeRead RIO
+  where
+    llmCodeSeq mfilter =
+      EFF.llmPathCWD >>= \ ocwd ->
+      case ocwd of
+        Just (LLM.Root root) ->
+          EFF.llmCodeDir          >>= \ cdir ->
+          EFF.llmCodeMsk          >>= \ cmsk ->
+          realPath (root ++ cdir) >>= \ efap ->
+          case efap of
+            -- TODO: DRY
+            Right fap ->
+              ( \ case
+                  ([], rs) -> Right $ LLM.FilePaths $ mconcat rs
+                  (ls, __) -> Left                            ls
+              )
+              . partitionEithers
+              <$> mapM (\ msk -> findFiles fap ("*" ++ fil ++ "*" ++ msk)) cmsk
+            Left err ->
+              pure $ Left [err]
+        Nothing ->
+          pure $ Left [noLlmConf]
+      where
+        fil =
+          case mfilter of
+            Just (LLM.Filter f) ->  f
+            Nothing             -> [ ]
+
+    llmCodeGet (LLM.AbsoluteFilePath abspath) =
+      EFF.llmPathCWD >>= \ ocwd ->
+      EFF.llmCodeDir >>= \ cdir ->
+      case ocwd of
+        -- TODO: DRY
+        Just (LLM.Root root) ->
+          realPath (root ++ cdir) >>= \ efap ->
+          case efap of
+            Right fap ->
+              if fap `isPrefixOf` abspath then
+                -- NOTE: Root relative path
+                Right . LLM.File . (,) (drop len abspath) . lines
+                <$> readFileStrict abspath
+              else
+                pure $ Left $ notPrefixRootAndMode fap abspath LLM.Code
+            Left  err ->
+              pure $ Left err
+            where
+              len = length root
+        Nothing ->
+          pure $ Left noLlmConf
+
+    llmCodeGit =
+      EFF.llmPathCWD >>= \ ocwd ->
+      case ocwd of
+        Just (LLM.Root root) ->
+          realPath root >>= \ efap ->
+          case efap of
+            -- TODO: DRY
+            Right fap ->
+              gitExist fap >>= \ igit ->
+              if igit then
+                gitBranchesDesc fap
+              else
+                pure $ Left "No GIT repo initialized"
+            Left err ->
+              pure $ Left err
+        Nothing ->
+          pure $ Left noLlmConf
+
+--------------------------------------------------------------------------------
+
+class
+  ( EFF.LlmConf m
+  , EFF.LlmCodeRoot m
+  )
+  => LlmCodeSave m
+  where
+    llmCodePut
+      :: String
+      -> LLM.Files
+      -> m (Either String String)
+
+instance
+  ( EFF.LlmConf     RIO
+  , EFF.LlmCodeRoot RIO
+  )
+  => LlmCodeSave RIO
+  where
+    -- TODO: Needs some refactoring at some point …
+    llmCodePut ___ (LLM.Files []) =
+      pure $ Left "No files provided, therefore no action performed"
+    llmCodePut txt (LLM.Files fs) =
+      EFF.llmPathCWD >>= \ ocwd ->
+      EFF.llmCodeDir >>= \ cdir ->
+      case ocwd of
+        Just (LLM.Root root) ->
+          realPath root >>= \ erap ->
+          case erap of
+            Right rp ->
+              gitExist     rp >>= \ igit ->
+              gitignoreTmp rp >>= \ itmp ->
+              case (igit, itmp) of
+                (True,  True) ->
+                  timestampUTC >>= \ mts ->
+                  case mts of
+                    Just ts ->
+                      realPath (root ++ "tmp") >>= \ etmp ->
+                      case etmp of
+                        Right tmp ->
+                          gitWorktreeAdd root ts tap >>= \ ewta ->
+                          (
+                            mapM
+                              ( \ (LLM.File (fp, fls)) ->
+                                  let
+                                    fil = tap ++ "/" ++ fp
+                                    len = length $ tap ++ "/"
+                                  in
+                                    if dir `isPrefixOf` fil then
+                                      ensureFolderPath tap fil           >>= \ eefp ->
+                                      writeFileStrict  fil (unlines fls) >>= \ ewfs ->
+                                      case (eefp, ewfs) of
+                                        (Right efp, Right wfs) ->
+                                          pure $ Right $ unlines
+                                          [ "* Ensuring folder exists:"
+                                          , efp
+                                          , "* Writing file to folder:"
+                                          , wfs
+                                          ]
+                                        (_, _) ->
+                                          pure $ Left $ unlines
+                                          [ "* Ensuring folder exists:"
+                                          , fromLeft "No error" eefp
+                                          , "* Writing file to folder:"
+                                          , fromLeft "No error" ewfs
+                                          ]
+                                    else
+                                      pure $ Left $
+                                      ( (drop len fil) ++
+                                        " doesn't start with " ++
+                                        (drop len dir)
+                                      )
+                              )
+                            fs
+                          ) >>= \ ewfs ->
+                          gitAddFiles         tap     >>= \ ewaf ->
+                          gitCommit           tap txt >>= \ ewcf ->
+                          gitWorktreeRem root tap     >>= \ ewrf ->
+                          case
+                            ( ewta
+                            , partitionEithers ewfs
+                            , ewaf
+                            , ewcf
+                            , ewrf
+                            )
+                          of
+                            (   Right wta
+                              , ( []
+                                , xs
+                                )
+                              , Right ___
+                              , Right wcf
+                              , Right wrf
+                              ) ->
+                              gitUpdateBranchDesc root ts txt >>= \ ewtb ->
+                              case ewtb of
+                                Right _ ->
+                                  pure $ Right $ unlines
+                                  [ "# Temporary worktree branch:"
+                                  , "## Adding:"
+                                  , wta
+                                  , "## Saving files:"
+                                  , concat xs
+                                  , "## Adding files and committing :"
+                                  , wcf
+                                  , "## Removing:"
+                                  , wrf
+                                  ]
+                                Left  e ->  pure $ Left e
+                            ( _, (es,__), _, _, _) ->
+                              gitUpdateBranchDesc root ts err >>= \ ewtb ->
+                              case ewtb of
+                                Right _ ->
+                                  pure $ Left $ unlines
+                                  [ "# Temporary worktree branch error(s):"
+                                  , "## Adding:"
+                                  , fromLeft "No error" ewta
+                                  , "## Adding description:"
+                                  , fromLeft "No error" ewtb
+                                  , "## Saving files:"
+                                  , concat es
+                                  , "## Adding files:"
+                                  , fromLeft "No error" ewaf
+                                  , "## Committing:"
+                                  , fromLeft "No error" ewcf
+                                  , "## Removing:"
+                                  , fromLeft "No error" ewrf
+                                  ]
+                                Left  e ->  pure $ Left e
+                              where
+                                err = "[ERROR]: " ++ txt
+                          where
+                            tap = tmp ++ "/" ++ ts
+                            dir = tap ++ "/" ++ cdir
+                        Left  e ->
+                          pure $ Left e
+                    _______ ->
+                      pure $ Left "No timestamp"
+                (False, ____) ->
+                  pure $ Left "No GIT repo initialized"
+                (____, False) ->
+                  pure $ Left "No /tmp/ folder added to the .gitignore file"
+            Left err ->
+              pure $ Left err
+        Nothing ->
+          pure $ Left noLlmConf
+
+--------------------------------------------------------------------------------
+
+class
+  ( EFF.LlmConf m
+  , EFF.LlmCodeConf m
+  )
+  => LlmCodeConf m
+  where
+    llmCodeAPI
+      :: m (Maybe String)
+    llmCodeKey
+      :: m (Maybe String)
+
+instance
+  ( EFF.LlmConf RIO
+  , EFF.LlmCodeConf RIO
+  )
+  => LlmCodeConf RIO
+  where
+    llmCodeAPI = getEnvVar "LLM_CODE_LOCALHOST_API"
+    llmCodeKey = pure Nothing
+
+--------------------------------------------------------------------------------
+
+class
+  ( EFF.LlmConf m
+  , EFF.LlmCodeConf m
+  )
+  => LlmCodePost m
+  where
+    llmCodeWeb
+      :: String
+      -> m (Either String String)
+
+instance
+  ( EFF.LlmConf RIO
+  , EFF.LlmCodeConf RIO
+  )
+  => LlmCodePost RIO
+  where
+    llmCodeWeb json =
+      EFF.llmCodeAPI >>= \ mapi ->
+      EFF.llmCodeKey >>= \ mkey ->
+      llmCurl json mapi mkey
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+class
+  EFF.LlmConf m
+  => LlmPlanRoot m
+  where
+    llmPlanDir
+      :: m String
+
+instance
+  ( EFF.LlmConf     RIO
+  , EFF.LlmPlanRoot RIO
+  )
+  => LlmPlanRoot RIO
+  where
+    llmPlanDir = pure "."
+
+--------------------------------------------------------------------------------
+
+class
+  EFF.LlmConf m
+  => LlmPlanMask m
+  where
+    llmPlanMsk
+      :: m [String]
+
+instance
+  ( EFF.LlmConf     RIO
+  , EFF.LlmPlanMask RIO
+  )
+  => LlmPlanMask RIO
+  where
+    llmPlanMsk =
+      pure
+        [ "*.org"
+        , "*.md"
+        ]
+
+--------------------------------------------------------------------------------
+
+class
+  ( EFF.LlmConf     m
+  , EFF.LlmPlanRoot m
+  , EFF.LlmPlanMask m
+  , EFF.LlmCodeRead m
+  )
+  => LlmPlanRead m
+  where
+    llmPlanSeq
+      :: Maybe LLM.Filter
+      -> m (Either [String] LLM.FilePaths)
+    llmPlanGet
+      :: String
+      -> m (Either String LLM.File)
+
+instance
+  ( EFF.LlmConf     RIO
+  , EFF.LlmPlanRoot RIO
+  , EFF.LlmPlanMask RIO
+  , EFF.LlmCodeRead RIO
+  )
+  => LlmPlanRead RIO
+  where
+    llmPlanSeq mfilter =
+      EFF.llmPathCWD >>= \ ocwd ->
+      case ocwd of
+        Just (LLM.Root root) ->
+          EFF.llmPlanDir          >>= \ pdir ->
+          EFF.llmPlanMsk          >>= \ pmsk ->
+          realPath (root ++ pdir) >>= \ efap ->
+          case efap of
+            -- TODO: DRY
+            Right fap ->
+              ( \ case
+                  ([], rs) -> Right $ LLM.FilePaths $ mconcat rs
+                  (ls, __) -> Left                            ls
+              )
+              . partitionEithers
+              <$> mapM (\ msk -> findFiles fap ("*" ++ fil ++ "*" ++ msk)) pmsk
+            Left err ->
+              pure $ Left [err]
+        Nothing ->
+          pure $ Left [noLlmConf]
+      where
+        fil =
+          case mfilter of
+            Just (LLM.Filter f) ->  f
+            Nothing             -> [ ]
+
+    llmPlanGet abspath =
+      EFF.llmPathCWD >>= \ ocwd ->
+      EFF.llmPlanDir >>= \ pdir ->
+      case ocwd of
+        -- TODO: DRY
+        Just (LLM.Root root) ->
+          realPath (root ++ pdir) >>= \ efap ->
+          case efap of
+            Right fap ->
+              if fap `isPrefixOf` abspath then
+                -- NOTE: Root relative path
+                Right . LLM.File . (,) (drop len abspath) . lines
+                <$> readFileStrict abspath
+              else
+                pure $ Left $ notPrefixRootAndMode fap abspath LLM.Plan
+            Left  err ->
+              pure $ Left err
+            where
+              len = length root
+        Nothing ->
+          pure $ Left noLlmConf
+
+--------------------------------------------------------------------------------
+
+class
+  ( EFF.LlmConf m
+  , EFF.LlmPlanConf m
+  )
+  => LlmPlanConf m
+  where
+    llmPlanAPI
+      :: m (Maybe String)
+    llmPlanKey
+      :: m (Maybe String)
+
+instance
+  ( EFF.LlmConf RIO
+  , EFF.LlmPlanConf RIO
+  )
+  => LlmPlanConf RIO
+  where
+    llmPlanAPI = getEnvVar "LLM_PLAN_LOCALHOST_API"
+    llmPlanKey = pure Nothing
+
+--------------------------------------------------------------------------------
+
+class
+  ( EFF.LlmConf m
+  , EFF.LlmPlanConf m
+  )
+  => LlmPlanPost m
+  where
+    llmPlanWeb
+      :: String
+      -> m (Either String String)
+
+instance
+  ( EFF.LlmConf RIO
+  , EFF.LlmPlanConf RIO
+  )
+  => LlmPlanPost RIO
+  where
+    llmPlanWeb json =
+      EFF.llmPlanAPI >>= \ mapi ->
+      EFF.llmPlanKey >>= \ mkey ->
+      llmCurl json mapi mkey
+
+--------------------------------------------------------------------------------
+--------------------------------------------------------------------------------
+
+-- HELPERS (public)
+
+getEnvVar
+  :: String
+  -> RIO (Maybe String)
+getEnvVar =
+  RestrictedIO . ENV.getEnv
+
+--------------------------------------------------------------------------------
+
+-- HELPERS (private)
+
+findFiles
+  :: FilePath
+  -> String
+  -> RIO (Either String [String])
+findFiles path mask =
+  -- NOTE: Remove any '\NUL` from filepaths
+  -- https://gitlab.haskell.org/ghc/ghc/-/merge_requests/10110
+  ( \case
+      Right str ->
+        Right
+        -- NOTE: We use absolute paths, but, only show relative
+        $ map (filter (/= '\NUL'))
+        $ lines str
+      Left  err ->
+        Left err
+  )
+  <$> withExitCodeCwd path "find"
+        -- NOTE: Use -ipath and -iname (case insensitive) instead?
+        [ path
+          -- NOTE: Limit to files, excluding symbolic links
+        , "-type", "f"
+          -- NOTE: Exclude tmp folder
+        , "-not"
+        , "-path"
+        , path ++ "/tmp/*"
+        , "-and"
+          -- NOTE: Exclude llm tpl folder
+        , "-not"
+        , "-ipath"
+        , path ++ "/llm/*"
+        , "-and"
+          -- NOTE: Exclude dot files and hereby tmp Emacs files (.*#)
+        , "-not"
+        , "-name"
+        , ".*"
+        , "-and"
+          -- NOTE: Look for filter mask
+        , "-path"
+        , mask
+        , "-print"
+        ]
+
+noLlmConf :: String
+noLlmConf =
+  "No EFF.LlmConf instance is defined."
+
+notPrefixRootAndMode
+  :: FilePath
+  -> FilePath
+  -> LLM.Mode
+  -> String
+notPrefixRootAndMode rpath apath mode =
+  rpath ++ " is not a prefix of " ++ apath ++ " for: " ++ show mode
+
+gitExist
+  :: FilePath
+  -> RIO Bool
+gitExist path =
+  ( \case
+      Right _ -> True
+      Left  _ -> False
+  )
+  <$> withExitCodeCwd path "git"
+        [ "status"
+        ]
+
+gitignoreTmp
+  :: FilePath
+  -> RIO Bool
+gitignoreTmp path =
+  any (== "/tmp/") . lines
+  <$> readFileStrict gi
+  where
+    gi = path ++ "/.gitignore"
+
+gitWorktreeAdd
+  :: FilePath
+  -> String
+  -> FilePath
+  -> RIO (Either String String)
+gitWorktreeAdd root ts path =
+  withExitCodeCwd root "git"
+    [ "worktree"
+    , "add", "-b", ts
+    , path
+    ]
+
+gitAddFiles
+  :: FilePath
+  -> RIO (Either String String)
+gitAddFiles path =
+  withExitCodeCwd path "git"
+    [ "add"
+    , "."
+    ]
+
+gitCommit
+  :: FilePath
+  -> String
+  -> RIO (Either String String)
+gitCommit root mesg =
+  withExitCodeCwd root "git"
+    [ "commit"
+    , "-m"
+    , mesg
+    ]
+
+gitWorktreeRem
+  :: FilePath
+  -> FilePath
+  -> RIO (Either String String)
+gitWorktreeRem root path =
+  withExitCodeCwd root "git"
+    [ "worktree"
+    , "remove"
+    , path
+    ]
+
+gitBranchesDesc
+  :: FilePath
+  -> RIO (Either String String)
+gitBranchesDesc root =
+  withExitCodeCwd root "git"
+    [ "config"
+    , "--get-regexp"
+    , "branch.*.description"
+    ]
+
+gitUpdateBranchDesc
+  :: FilePath
+  -> String
+  -> String
+  -> RIO (Either String String)
+gitUpdateBranchDesc path ts desc =
+  withExitCodeCwd path "git"
+    [ "config"
+    , "branch." ++ ts ++ ".description"
+    , desc
+    ]
+
+llmCurl
+  :: String
+  -> Maybe String
+  -> Maybe String
+  -> RIO (Either String String)
+llmCurl json mapi mkey =
+  case (mapi, mkey) of
+    (Nothing, _ ) ->
+      RestrictedIO $ pure $ Left "No API address was provided"
+    (Just api, Nothing) ->
+      withExitCodeStdIn "curl"
+        ( [ -- "--verbose"
+            "--silent"
+          , "--show-error"
+          ]
+          ++ hs ++
+          [ -- NOTE: https://curl.se/docs/manpage.html#--json
+            "--json", "@-"
+          , api ++ "/chat/completions"
+          ]
+        )
+        json
+    (Just api, Just key) ->
+      withExitCodeStdIn "curl"
+        ( [ --"--verbose"
+            "--silent"
+          , "--show-error"
+          , "--header", "Authorization: " ++ key
+          ]
+          ++ hs ++
+          [ -- NOTE: https://curl.se/docs/manpage.html#--json
+            "--json", "@-"
+          , api ++ "/chat/completions"
+          ]
+        )
+        json
+    where
+      hs =
+        [ "--header" , "Accept: application/json"
+        , "--header" , "Accept-Encoding: gzip, deflate, br"
+        , "--header" , "Content-Type: application/json; charset=utf-8"
+        , "--header" , "User-Agent: Λ-gent/0.11"
+        ]
+
+readFileStrict
+  :: FilePath
+  -> RIO String
+readFileStrict path =
+  -- TODO:
+  --
+  -- Refactor `RIO String` to `RIO (Either String String)`
+  RestrictedIO $
+  do
+    eproc <-
+      try
+        ( aux
+        ) :: IO (Either SomeException String)
+    case eproc of
+        Right txt -> pure txt
+        Left  ___ -> pure []
+  where
+    aux =
+      readFile path >>= \cs ->
+      length cs `seq` pure cs
+
+writeFileStrict
+  :: FilePath
+  -> String
+  -> RIO (Either String String)
+writeFileStrict path txt =
+  RestrictedIO $
+  do
+    eproc <-
+      try
+        ( writeFile path txt
+        ) :: IO (Either SomeException ())
+    case eproc of
+        Right _ ->
+          pure $ Right path
+        Left  e -> pure $ Left $ show e
+
+realPath
+  :: FilePath
+  -> RIO (Either String String)
+realPath path =
+  -- NOTE: `realpath` removes any trailing '/' for directories
+  --
+  -- NOTE: Remove any '\NUL` from filepaths
+  -- https://gitlab.haskell.org/ghc/ghc/-/merge_requests/10110
+  ( \case
+      Right str -> Right $ filter (/= '\n') str
+      Left  err -> Left err
+  )
+  <$> withExitCode "realpath"
+        [ path
+        ]
+
+ensureFolderPath
+  :: FilePath
+  -> FilePath
+  -> RIO (Either String String)
+ensureFolderPath root path =
+  withExitCodeCwd root "dirname" [ path ] >>= \ eadp ->
+  case eadp of
+    Right adp ->
+      withExitCodeCwd root "mkdir" [ "-p", foo ] >>= \ emeh ->
+      case emeh of
+        Right _ -> pure $ Right foo
+        Left  e -> pure $ Left  e
+      where
+        foo = filter (/= '\n') adp
+    Left  err -> pure $ Left err
+
+timestampUTC :: RIO (Maybe String)
+timestampUTC =
+  ( \case
+      Right cs -> Just $ filter ( \ c -> c == '-' || isDigit c ) cs
+      Left  __ -> Nothing
+  )
+  <$> withExitCode "date"
+        [ "-u"
+        , "+'%Y%m%d-%H%M%S-%N'"
+        ]
+
+withExitCode
+  ::  String
+  -> [String]
+  -> RIO (Either String String)
+withExitCode cmd args =
+  RestrictedIO $
+  do
+    eproc <-
+      try
+        ( readProcessWithExitCode cmd args []
+        ) :: IO (Either SomeException ((ExitCode, String, String)))
+    case eproc of
+        Right (exitcode, out, err) ->
+          case exitcode of
+            ExitSuccess ->
+              pure $ Right out
+            ExitFailure _ ->
+              pure $ Left $ err
+        Left e -> pure $ Left $ show e
+
+withExitCodeStdIn
+  ::  String
+  -> [String]
+  ->  String
+  -> RIO (Either String String)
+withExitCodeStdIn cmd args txt =
+  RestrictedIO $
+  do
+    eproc <-
+      try
+        ( aux
+        ) :: IO (Either SomeException ((ExitCode, String, String)))
+    case eproc of
+        Right (exitcode, out, err) ->
+          case exitcode of
+            ExitSuccess ->
+              -- NOTE: When debugging, ex: `curl`, add the `--verbose` flag,
+              -- which uses `stderr`. Just combine `err` and `out` like this:
+              --
+              -- pure $ Right ("[DEBUG]: " ++ err ++ "\n" ++ out)
+              pure $ Right out
+            ExitFailure _ ->
+              pure $ Left $ err
+        Left e -> pure $ Left $ show e
+    where
+      raw = proc cmd args
+      rcp =
+        raw
+          { std_in  = CreatePipe
+          , std_out = CreatePipe
+          , std_err = CreatePipe
+          }
+      aux =
+        do
+          (Just hinp, Just hout, Just herr, ph) <- createProcess rcp
+          hPutStrLn hinp txt
+          hClose    hinp
+          out <- hGetContents hout
+          err <- hGetContents herr
+          exitcode <- waitForProcess ph
+          return (exitcode, out, err)
+
+withExitCodeCwd
+  :: String
+  -> String
+  -> [String]
+  -> RIO (Either String String)
+withExitCodeCwd path cmd args =
+  RestrictedIO $
+  do
+    eproc <-
+      try
+        ( readCreateProcessWithExitCode rcp []
+        ) :: IO (Either SomeException ((ExitCode, String, String)))
+    case eproc of
+        Right (exitcode, out, err) ->
+          case exitcode of
+            ExitSuccess ->
+              pure $ Right out
+            ExitFailure _ ->
+              pure $ Left $ err
+        Left e -> pure $ Left $ show e
+    where
+      raw = proc cmd args
+      rcp = raw { cwd = Just path }
diff --git a/src/Internal/Utils.hs b/src/Internal/Utils.hs
new file mode 100644
--- /dev/null
+++ b/src/Internal/Utils.hs
@@ -0,0 +1,131 @@
+{-# OPTIONS_GHC -Wall -Werror #-}
+
+{-# LANGUAGE NoGeneralizedNewtypeDeriving #-}
+{-# LANGUAGE Safe                         #-}
+
+--------------------------------------------------------------------------------
+
+-- |
+-- Copyright  : (c) 2026 SPISE MISU ApS
+-- License    : SSPL-1.0 OR AGPL-3.0-only
+-- Maintainer : SPISE MISU <mail+hackage@spisemisu.com>
+-- Stability  : experimental
+
+--------------------------------------------------------------------------------
+
+module Internal.Utils
+  ( -- * Files
+    files
+  , file
+    -- * History
+  , chits
+  , chats
+    -- * Helpers
+  , combine
+  , leftpad
+  , index
+  , split
+  , linesOptNums
+  )
+where
+
+--------------------------------------------------------------------------------
+
+import           Prelude hiding ( lines )
+import qualified Prelude as Prelude
+
+--------------------------------------------------------------------------------
+
+combine
+  :: [ (String, String) ]
+  -> [ String ]
+combine =
+  map
+  ( \ (x, y) ->
+      if null x then
+        y
+      else
+        x ++ ": " ++ y
+  )
+
+leftpad
+  :: Char
+  -> Int
+  -> [Char]
+  -> [Char]
+leftpad chr rep cs =
+  replicate (rep - length xs) chr ++ xs
+  where
+    xs = take rep cs
+
+index
+  :: Int
+  -> Int
+  -> String
+index rep idx =
+  leftpad '0' rep $ show idx
+
+split
+  :: Char
+  ->  String
+  -> [String]
+split sep str =
+  case dropWhile (== sep) str of
+    [] -> []
+    cs ->
+      b : split sep bs
+      where
+        (b, bs) = break (== sep) cs
+
+--------------------------------------------------------------------------------
+
+files
+  :: String
+  -> Bool
+  -> [ String ]
+  -> [ (String, String) ]
+files prefix nums fs =
+  linesOptNums prefix nums 0 fs
+
+file
+  :: Bool
+  -> String
+  -> [ (String, String) ]
+file nums f =
+  linesOptNums [] nums 1 $ Prelude.lines f
+
+--------------------------------------------------------------------------------
+
+chits
+  :: Bool
+  -> [ String ]
+  -> [ (String, String) ]
+chits nums fs =
+  linesOptNums [] nums 0 $ reverse fs
+
+chats
+  :: Bool
+  -> [ String ]
+  -> [ (String, String) ]
+chats nums fs =
+  linesOptNums [] nums 0 $ reverse fs
+
+--------------------------------------------------------------------------------
+
+-- HELPERS (private)
+
+linesOptNums
+  :: String
+  -> Bool
+  -> Int
+  -> [ String ]
+  -> [ (String, String) ]
+linesOptNums prefix nums origo xs =
+  zipWith (\ idx rel -> (prefix ++ f idx, rel)) [origo..] xs
+  where
+    len   = length $ show $ length xs
+    f i =
+      if nums then
+        index len i
+      else
+        []
