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Root Cause: - n8n recently added a `description` field to workflows - The field is returned by GET /workflows/:id endpoint - But PUT /workflows/:id rejects it with "additional properties" error - Our cleanWorkflowForUpdate() wasn't filtering it out The Fix: 1. Added `description` to the list of removed fields in cleanWorkflowForUpdate() 2. Added `description` field to Workflow type definition 3. Added test case to verify description field is excluded Code Review Improvements: - Removed diagnostic logging code (was only needed for debugging) - Improved comment accuracy in type definition - Added comprehensive test coverage for description field Testing: - Build succeeds - New test passes: "should exclude description field for n8n API compatibility" - All unit tests pass - Integration tests confirmed fix works with real n8n API Related: #431 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en