diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## 0.2.2.0 - 2020-07-18
+
+### Added
+
+ - Evaluation log
+
 ## 0.2.1.0 - 2020-06-17
 
 ### Added
diff --git a/hercules-ci-api-agent.cabal b/hercules-ci-api-agent.cabal
--- a/hercules-ci-api-agent.cabal
+++ b/hercules-ci-api-agent.cabal
@@ -1,9 +1,9 @@
 cabal-version: 1.12
 
 name:           hercules-ci-api-agent
-version:        0.2.1.0
+version:        0.2.2.0
 synopsis:       API definition for Hercules CI Agent to talk to hercules-ci.com or Hercules CI Enterprise
-category:       API, CI, Testing, DevOps
+category:       API, CI, Testing, DevOps, Nix
 homepage:       https://github.com/hercules-ci/hercules-ci-agent#readme
 bug-reports:    https://github.com/hercules-ci/hercules-ci-agent/issues
 author:         Hercules CI contributors
diff --git a/src/Hercules/API/Agent/Evaluate/EvaluateTask.hs b/src/Hercules/API/Agent/Evaluate/EvaluateTask.hs
--- a/src/Hercules/API/Agent/Evaluate/EvaluateTask.hs
+++ b/src/Hercules/API/Agent/Evaluate/EvaluateTask.hs
@@ -21,7 +21,8 @@
         primaryInput :: Text, -- HTTP URL
         otherInputs :: Map Identifier Text, -- identifier -> HTTP URL
         autoArguments :: Map Text (SubPathOf Identifier), -- argument name -> identifier
-        nixPath :: [NixPathElement (SubPathOf Identifier)] -- NIX_PATH element -> identifier
+        nixPath :: [NixPathElement (SubPathOf Identifier)], -- NIX_PATH element -> identifier
+        logToken :: Text
       }
   deriving (Generic, Show, Eq, ToJSON, FromJSON, ToSchema)