diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,5 @@
+# Revision history for pms-application-service
+
+## 0.0.1.0 -- 2025-05-31
+
+* First version.
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
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diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,22 @@
+# pms-application-service
+
+[`pty-mcp-server`](https://github.com/phoityne/pty-mcp-server) is a multi-threaded application designed to handle multiple domain-specific tasks concurrently.  
+`pms-application-service` is one of its internal packages, responsible for coordinating core application logic and managing concurrent execution across threads.
+
+This package interprets user-intent commands (parsed from JSON-RPC requests) and executes them within specific domain contexts.  
+It bridges structured input from the UI layer with the infrastructure layer's effectful operations, ensuring that requests are processed in a deterministic and decoupled manner.
+
+In addition to command dispatching, `pms-application-service` manages the lifecycle of domain-aware applications and supervises their execution threads.  
+It provides the orchestration required to safely run multiple applications in parallel, maintaining responsiveness and isolation across concurrent tasks.
+
+---
+
+## Package Structure
+![Package Structure](https://raw.githubusercontent.com/phoityne/pms-application-service/main/docs/31-1.png)
+---
+
+## Module Structure
+![Module Structure](https://raw.githubusercontent.com/phoityne/pms-application-service/main/docs/31-2.png)
+
+
+---
diff --git a/pms-application-service.cabal b/pms-application-service.cabal
new file mode 100644
--- /dev/null
+++ b/pms-application-service.cabal
@@ -0,0 +1,133 @@
+cabal-version:      3.12
+-- The cabal-version field refers to the version of the .cabal specification,
+-- and can be different from the cabal-install (the tool) version and the
+-- Cabal (the library) version you are using. As such, the Cabal (the library)
+-- version used must be equal or greater than the version stated in this field.
+-- Starting from the specification version 2.2, the cabal-version field must be
+-- the first thing in the cabal file.
+
+-- Initial package description 'pms-application-service' generated by
+-- 'cabal init'. For further documentation, see:
+--   http://haskell.org/cabal/users-guide/
+--
+-- The name of the package.
+name:               pms-application-service
+
+-- The package version.
+-- See the Haskell package versioning policy (PVP) for standards
+-- guiding when and how versions should be incremented.
+-- https://pvp.haskell.org
+-- PVP summary:     +-+------- breaking API changes
+--                  | | +----- non-breaking API additions
+--                  | | | +--- code changes with no API change
+version:            0.0.1.0
+
+-- A short (one-line) description of the package.
+synopsis:           pms-application-service
+
+-- A longer description of the package.
+description:        README.md
+
+-- The license under which the package is released.
+license:            Apache-2.0
+
+-- The file containing the license text.
+license-file:       LICENSE
+
+-- The package author(s).
+author:             phoityne.hs@gmail.com
+
+-- An email address to which users can send suggestions, bug reports, and patches.
+maintainer:         phoityne.hs@gmail.com
+
+-- A copyright notice.
+copyright:          2025-2026 phoityne.hs@gmail.com
+category:           AI
+build-type:         Simple
+homepage:           https://github.com/phoityne/pms-application-service
+bug-reports:        https://github.com/phoityne/pms-application-service/issues
+
+-- Extra doc files to be distributed with the package, such as a CHANGELOG or a README.
+extra-doc-files:    README.md,
+                    CHANGELOG.md
+
+-- Extra source files to be distributed with the package, such as examples, or a tutorial module.
+-- extra-source-files:
+
+
+library
+    -- Import common warning flags.
+    ghc-options: -Wall -Wno-x-partial
+
+    -- Modules exported by the library.
+    exposed-modules:  PMS.Application.Service.DM.Type,
+                      PMS.Application.Service.DM.Constant,
+                      PMS.Application.Service.App.Control,
+                      PMS.Application.Service.DS.Core,
+                      PMS.Application.Service.DS.Utility
+ 
+
+    -- Modules included in this library but not exported.
+    -- other-modules:    Paths_pms_application_service
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+
+    -- Other library packages from which modules are imported.
+    build-depends:    base ^>=4.21.0.0,
+                      aeson,
+                      lens,
+                      data-default,
+                      fast-logger,
+                      monad-logger,
+                      safe-exceptions,
+                      yaml,
+                      text,
+                      mtl,
+                      async,
+                      async-pool,
+                      pms-domain-model
+
+    -- Directories containing source files.
+    hs-source-dirs:   src
+
+    -- Base language which the package is written in.
+    default-language: GHC2021
+    default-extensions:  LambdaCase
+
+test-suite pms-application-service-test
+    -- Import common warning flags.
+    ghc-options: -Wall -Wno-x-partial
+
+    -- Base language which the package is written in.
+    default-language: GHC2021
+
+    -- Modules included in this executable, other than Main.
+    other-modules:    PMS.Application.Service.App.ControlSpec
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+
+    -- The interface type and version of the test suite.
+    type:             exitcode-stdio-1.0
+
+    -- Directories containing source files.
+    hs-source-dirs:   test
+
+    -- The entrypoint to the test suite.
+    main-is:          Spec.hs
+
+    -- Test dependencies.
+    build-depends:    base ^>=4.21.0.0,
+                      hspec,
+                      hspec-discover,
+                      data-default,
+                      stm,
+                      monad-logger,
+                      async,
+                      unix,
+                      lens,
+                      pms-domain-model,
+                      pms-application-service
+    build-tool-depends:
+      hspec-discover:hspec-discover
diff --git a/src/PMS/Application/Service/App/Control.hs b/src/PMS/Application/Service/App/Control.hs
new file mode 100644
--- /dev/null
+++ b/src/PMS/Application/Service/App/Control.hs
@@ -0,0 +1,75 @@
+{-# LANGUAGE LambdaCase #-}
+
+module PMS.Application.Service.App.Control where
+
+import qualified Control.Exception.Safe as E
+import Data.Default
+import Data.Yaml
+import Control.Lens
+import System.Log.FastLogger
+import System.IO
+
+import qualified PMS.Domain.Model.DM.Type as DM
+import qualified PMS.Domain.Model.DS.Utility as DM
+
+import PMS.Application.Service.DM.Type
+import PMS.Application.Service.DS.Utility
+import PMS.Application.Service.DS.Core
+import PMS.Application.Service.DM.Constant
+
+
+-- |
+--
+run :: ArgData
+    -> [DM.DomainContext ()]
+    -> IO ()
+run args apps = do
+  hPutStrLn stderr "[INFO] PMS.Application.Service.App.Control.run called."
+
+  conf <- maybe (pure def) decodeFileThrow (args^.yamlArgData)
+  defDom <- DM.defaultDomainData
+
+  hPutStrLn stderr $ "[INFO] PMS.Application.Service.App.Control.run conf." ++ show conf
+
+  let domDat = defDom {
+               DM._logDirDomainData   = conf^.logDirConfigData
+             , DM._logLevelDomainData = conf^.logLevelConfigData
+             , DM._scriptsDirDomainData = conf^.scriptsDirConfigData
+             , DM._promptsDomainData = conf^.promptsConfigData
+             }
+      appDat = def {
+               _appsAppData = apps
+             }
+  DM.createLogger domDat _LOG_FILE_NAME >>= runWithLogger domDat appDat
+
+
+-- |
+--
+runWithLogger :: DM.DomainData -> AppData -> (TimedFastLogger, IO ()) -> IO ()
+runWithLogger domDat appDat (logger, finalizeLogger) = 
+  flip E.catchAny exception
+    $ flip E.finally finalize
+    $ runApp domDat appDat logger app
+    >>= \case
+      Right _ -> return ()
+      Left  e -> errorEnd e
+
+  where
+    finalize = do
+      hPutStrLn stderr "-----------------------------------------------------------------------------"
+      hPutStrLn stderr "[INFO] PMS.Application.Service.App.Control.run finalize called."
+      finalizeLogger
+      hPutStrLn stderr "-----------------------------------------------------------------------------"
+
+    exception e = do
+      hPutStrLn stderr "-----------------------------------------------------------------------------"
+      hPutStrLn stderr "[ERROR] PMS.Application.Service.App.Control.run exception occurred."
+      hPutStrLn stderr $ show e
+      hPutStrLn stderr "-----------------------------------------------------------------------------"
+      E.throwIO e
+
+    errorEnd e = do
+      hPutStrLn stderr "-----------------------------------------------------------------------------"
+      hPutStrLn stderr "[ERROR] PMS.Application.Service.App.Control.run end with error."
+      hPutStrLn stderr $ show e
+      hPutStrLn stderr "-----------------------------------------------------------------------------"
diff --git a/src/PMS/Application/Service/DM/Constant.hs b/src/PMS/Application/Service/DM/Constant.hs
new file mode 100644
--- /dev/null
+++ b/src/PMS/Application/Service/DM/Constant.hs
@@ -0,0 +1,10 @@
+module PMS.Application.Service.DM.Constant where
+
+
+--------------------------------------------------------------------------------
+-- |
+--
+_LOG_FILE_NAME :: String
+_LOG_FILE_NAME = "pms-application-service.log"
+
+
diff --git a/src/PMS/Application/Service/DM/Type.hs b/src/PMS/Application/Service/DM/Type.hs
new file mode 100644
--- /dev/null
+++ b/src/PMS/Application/Service/DM/Type.hs
@@ -0,0 +1,84 @@
+{-# LANGUAGE TemplateHaskell #-}
+
+
+module PMS.Application.Service.DM.Type where
+
+import Data.Data
+import Data.Default
+import Control.Lens
+import Data.Aeson
+import Data.Aeson.TH
+import Control.Monad.Logger
+import Control.Monad.Reader
+import Control.Monad.Except
+
+import qualified PMS.Domain.Model.DM.Type as DM
+
+
+--------------------------------------------------------------------------------
+-- |
+--
+data ArgData = ArgData {
+    _yamlArgData :: Maybe FilePath
+  } deriving (Data, Show, Read, Eq)
+
+makeLenses ''ArgData
+$(deriveJSON
+  defaultOptions {
+      fieldLabelModifier = tail . reverse . drop (length "ArgData") . reverse
+    }
+  ''ArgData)
+
+instance Default ArgData where
+  def = ArgData {
+        _yamlArgData = Nothing
+      }
+
+
+--------------------------------------------------------------------------------
+-- |
+--
+data ConfigData = ConfigData {
+    _logDirConfigData :: Maybe FilePath
+  , _logLevelConfigData :: LogLevel
+  , _scriptsDirConfigData :: FilePath
+  , _promptsConfigData :: [String]
+  } deriving (Show, Read, Eq)
+
+makeLenses ''ConfigData
+$(deriveJSON
+  defaultOptions {
+      fieldLabelModifier = tail . reverse . drop (length "ConfigData") . reverse
+    }
+  ''ConfigData)
+
+instance Default ConfigData where
+  def = ConfigData {
+        _logDirConfigData  = Nothing
+      , _logLevelConfigData = LevelDebug
+      , _scriptsDirConfigData = "./scripts"
+      , _promptsConfigData = [
+          "ghci>"
+        , "]$"
+        , ")?"
+        , "password:"
+        ]
+      }
+
+
+--------------------------------------------------------------------------------
+-- |
+--
+data AppData = AppData {
+               _appsAppData :: [DM.DomainContext ()]
+             }
+instance Default AppData where
+  def = AppData {
+          _appsAppData = []
+        }
+
+makeLenses ''AppData
+
+-- |
+--
+type AppContext = ReaderT AppData (ReaderT DM.DomainData (ExceptT DM.ErrorData (LoggingT IO)))
diff --git a/src/PMS/Application/Service/DS/Core.hs b/src/PMS/Application/Service/DS/Core.hs
new file mode 100644
--- /dev/null
+++ b/src/PMS/Application/Service/DS/Core.hs
@@ -0,0 +1,50 @@
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module PMS.Application.Service.DS.Core where
+
+import Control.Monad.Logger
+import qualified Data.Text as T
+import Control.Monad.Reader
+import Control.Lens
+import Control.Exception
+import System.IO
+import Control.Monad.Except
+
+import qualified PMS.Domain.Model.DM.Type as DM
+import qualified PMS.Domain.Model.DM.Constant as DM
+
+import PMS.Application.Service.DM.Type
+import PMS.Application.Service.DS.Utility
+
+import Control.Concurrent.Async
+
+-- |
+--
+app :: AppContext ()
+app = flip catchError errHdl $ do
+  $logDebugS DM._LOGTAG "app called."
+
+  liftIOE $ hSetBuffering stderr LineBuffering
+
+  domCtxs <- view appsAppData <$> ask
+  domDat  <- lift ask
+
+  liftIOE (start domDat domCtxs) >>= \case
+    (_, Right _) -> $logInfoS DM._LOGTAG "some threads stopped. exit."
+    (_, Left e)  -> $logErrorS DM._LOGTAG  $ T.pack $ "some threads stopped. " ++ show e
+
+  where
+    errHdl :: String -> AppContext ()
+    errHdl msg = do
+      $logErrorS DM._LOGTAG $ T.pack $ "app: exception occurred. skip. " ++ msg
+      
+    start :: DM.DomainData
+          -> [DM.DomainContext ()]
+          -> IO (Async (), Either SomeException ())
+    start domDat domCtxs = do
+      as <- mapM (go domDat) domCtxs
+      waitAnyCatchCancel as
+
+    go :: DM.DomainData -> DM.DomainContext () -> IO (Async ())
+    go domDat domCtx = async $ domCtx domDat
diff --git a/src/PMS/Application/Service/DS/Utility.hs b/src/PMS/Application/Service/DS/Utility.hs
new file mode 100644
--- /dev/null
+++ b/src/PMS/Application/Service/DS/Utility.hs
@@ -0,0 +1,34 @@
+module PMS.Application.Service.DS.Utility where
+
+
+import System.Log.FastLogger
+import qualified Control.Exception.Safe as E
+import Control.Monad.IO.Class
+import Control.Monad.Except
+import Control.Monad.Reader
+
+import qualified PMS.Domain.Model.DM.Type as DM
+import qualified PMS.Domain.Model.DS.Utility as DM
+
+import PMS.Application.Service.DM.Type
+
+-- |
+--
+runApp :: DM.DomainData -> AppData -> TimedFastLogger -> AppContext a -> IO (Either DM.ErrorData a)
+runApp domDat appDat logger ctx =
+  DM.runFastLoggerT domDat logger
+    $ runExceptT
+    $ flip runReaderT domDat
+    $ runReaderT ctx appDat
+
+
+-- |
+--
+liftIOE :: IO a -> AppContext a
+liftIOE f = liftIO (go f) >>= liftEither
+  where
+    go :: IO b -> IO (Either String b)
+    go x = E.catchAny (Right <$> x) errHdl
+
+    errHdl :: E.SomeException -> IO (Either String a)
+    errHdl = return . Left . show
diff --git a/test/PMS/Application/Service/App/ControlSpec.hs b/test/PMS/Application/Service/App/ControlSpec.hs
new file mode 100644
--- /dev/null
+++ b/test/PMS/Application/Service/App/ControlSpec.hs
@@ -0,0 +1,88 @@
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module PMS.Application.Service.App.ControlSpec (spec) where
+
+import Test.Hspec
+import Data.Default
+import Control.Lens
+import qualified Control.Concurrent as C
+
+import qualified PMS.Domain.Model.DM.Type as DM
+import qualified PMS.Application.Service.App.Control as SUT
+
+-- |
+--
+data SpecContext = SpecContext {}
+
+makeLenses ''SpecContext
+
+defaultSpecContext :: IO SpecContext
+defaultSpecContext = do
+  return SpecContext {}
+
+-- |
+--
+spec :: Spec
+spec = do
+  runIO $ putStrLn "Start Spec."
+  beforeAll setUpOnce $ 
+    afterAll tearDownOnce . 
+      beforeWith setUp . 
+        after tearDown $ run
+
+-- |
+--
+setUpOnce :: IO SpecContext
+setUpOnce = do
+  putStrLn "[INFO] EXECUTED ONLY ONCE BEFORE ALL TESTS START."
+  defaultSpecContext
+
+-- |
+--
+tearDownOnce :: SpecContext -> IO ()
+tearDownOnce _ = do
+  putStrLn "[INFO] EXECUTED ONLY ONCE AFTER ALL TESTS FINISH."
+
+-- |
+--
+setUp :: SpecContext -> IO SpecContext
+setUp _ = do
+  putStrLn "[INFO] EXECUTED BEFORE EACH TEST STARTS."
+  defaultSpecContext
+
+-- |
+--
+tearDown :: SpecContext -> IO ()
+tearDown _ = do
+  putStrLn "[INFO] EXECUTED AFTER EACH TEST FINISHES."
+
+-- |
+--
+run :: SpecWith SpecContext
+run = do
+  describe "run" $ do
+    context "when DomainContext" $ do
+      it "should be run" $ \_ -> do 
+        putStrLn "[INFO] EXECUTING THE FIRST TEST."
+
+        let args = def
+            apps = [sample1, sample2]
+            
+        SUT.run args apps
+
+-- |
+--
+sample1 :: DM.DomainContext ()
+sample1 _ = do
+  putStrLn $ "[INFO] sample1 called."
+  C.threadDelay (2 * 1000 * 1000) 
+  putStrLn $ "[INFO] sample1 called. end."
+
+-- |
+--
+sample2 :: DM.DomainContext ()
+sample2 _ = do
+  putStrLn $ "[INFO]   sample2 called."
+  C.threadDelay (3 * 1000 * 1000) 
+  putStrLn $ "[INFO]   sample2 called. end."
diff --git a/test/Spec.hs b/test/Spec.hs
new file mode 100644
--- /dev/null
+++ b/test/Spec.hs
@@ -0,0 +1,1 @@
+{-# OPTIONS_GHC -F -pgmF hspec-discover #-}
