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**Critical Fix**: Tests now properly test the MCP handler layer (the actual product) instead of raw API client. **Changes**: - All 15 tests now use `handleCreateWorkflow()` MCP handler - Tests validate `McpToolResponse` structure (`success`, `data`, `error`) - Created `mcp-context.ts` helper for configuring InstanceContext - Fixed ERROR_HANDLING_WORKFLOW to add main connection (MCP validation requirement) - Updated error/edge case tests to expect validation failures (correct MCP behavior) **MCP Handler Validation**: - Error scenarios now correctly expect `success: false` with validation errors - Edge cases updated to reflect MCP handler's proper pre-validation - Documents that MCP validation is CORRECT behavior (catches errors early) **Test Results**: All 15 scenarios passing - 8 valid workflow tests → expect `success: true` - 7 validation tests (errors/edge cases) → expect `success: false` **Why This Matters**: AI assistants interact with MCP handlers, not raw API client. Testing the wrong layer would miss MCP-specific logic and validation. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>