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Fixed validation bug where mcpTrigger nodes were incorrectly flagged as "disconnected nodes" when using n8n_update_partial_workflow or n8n_update_full_workflow. This blocked ALL updates to MCP server workflows. Changes: - Extended validateWorkflowStructure() to check all 7 connection types (main, error, ai_tool, ai_languageModel, ai_memory, ai_embedding, ai_vectorStore) - Updated trigger node validation to accept either outgoing OR inbound connections - Added 7 new tests covering all AI connection types Fixes #503 Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Romuald Członkowski <romualdczlonkowski@MacBook-Pro-Romuald.local> Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>