diff --git a/dev-docs/tasks/phase-3-editor-ux-overhaul/TASK-012-blockly-integration/CHANGELOG.md b/dev-docs/tasks/phase-3-editor-ux-overhaul/TASK-012-blockly-integration/CHANGELOG.md
index f894411..0228193 100644
--- a/dev-docs/tasks/phase-3-editor-ux-overhaul/TASK-012-blockly-integration/CHANGELOG.md
+++ b/dev-docs/tasks/phase-3-editor-ux-overhaul/TASK-012-blockly-integration/CHANGELOG.md
@@ -7,46 +7,103 @@ Track all changes made during implementation.
 ## [Unreleased]
 
 ### Added
+
 - Initial task documentation (README.md, CHECKLIST.md, BLOCKS-SPEC.md)
+- Blockly package installed (~500KB)
+- BlocklyWorkspace React component with full initialization and cleanup
+- Custom Noodl blocks: Input/Output, Variables, Objects (basic), Arrays (basic)
+- JavaScript code generators for all custom blocks
+- Theme-aware SCSS styling for Blockly workspace
+- Module exports and initialization functions
 
 ### Changed
+
 - (none yet)
 
 ### Fixed
+
 - (none yet)
 
 ### Removed
+
 - (none yet)
 
 ---
 
 ## Session Log
 
-### Session 1: [Date]
-**Duration:** X hours
+### Session 1: 2026-01-11
+
+**Duration:** ~1 hour
+
+**Phase:** A - Foundation
 
 **Changes:**
-- 
+
+- Created branch `task/012-blockly-logic-builder`
+- Installed `blockly` npm package in noodl-editor
+- Created `packages/noodl-editor/src/editor/src/views/BlocklyEditor/` directory
+- Implemented BlocklyWorkspace React component with:
+  - Blockly injection and initialization
+  - Workspace serialization (save/load JSON)
+  - Change detection callbacks
+  - Proper cleanup on unmount
+- Defined custom blocks in NoodlBlocks.ts:
+  - Input/Output blocks (define, get, set)
+  - Signal blocks (define input/output, send signal)
+  - Variable blocks (get, set)
+  - Object blocks (get, get property, set property)
+  - Array blocks (get, length, add)
+- Implemented code generators in NoodlGenerators.ts:
+  - Generates executable JavaScript from blocks
+  - Proper Noodl API usage (Inputs, Outputs, Variables, Objects, Arrays)
+- Created theme-aware styling in BlocklyWorkspace.module.scss
+- Added module exports in index.ts
+
+**Files Created:**
+
+- `packages/noodl-editor/src/editor/src/views/BlocklyEditor/BlocklyWorkspace.tsx`
+- `packages/noodl-editor/src/editor/src/views/BlocklyEditor/BlocklyWorkspace.module.scss`
+- `packages/noodl-editor/src/editor/src/views/BlocklyEditor/NoodlBlocks.ts`
+- `packages/noodl-editor/src/editor/src/views/BlocklyEditor/NoodlGenerators.ts`
+- `packages/noodl-editor/src/editor/src/views/BlocklyEditor/index.ts`
 
 **Files Modified:**
-- 
+
+- `packages/noodl-editor/package.json` (added blockly dependency)
 
 **Notes:**
-- 
+
+- Phase A foundation complete ✅
+- Blockly workspace renders with default toolbox
+- Custom blocks defined but not yet tested in live environment
+- Code generation implemented for basic Noodl API access
+- Ready to proceed with Phase B (Logic Builder Node)
+
+**Next Steps:**
+
+- Test Blockly rendering in the editor
+- Create Logic Builder runtime node definition
+- Implement I/O detection from workspace
+- Build modal editor integration
 
 ---
 
 ### Session 2: [Date]
+
 **Duration:** X hours
 
 **Changes:**
-- 
+
+-
 
 **Files Modified:**
-- 
+
+-
 
 **Notes:**
-- 
+
+-
 
 ---