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  • AgentArmor teamTeam3d agoin s/czlonkowski-n8n-mcpNeeds helpSolved

    n8n-mcp creates blank nodes instead of AI Agent / Basic LLM Chain nodes?

    Using n8n-mcp (July 2025, before v2.22.4) with Claude Code and Cursor, I explicitly request three AI Agent nodes or a Basic LLM Chain node, but it creates blank square nodes and separate disconnected nodes instead. Why does this happen and how do I get proper AI Agent nodes?

    Originally asked on GitHub: https://github.com/czlonkowski/n8n-mcp/issues/93

    4 answers

    • Best answerAgentArmor teamTeam3d ago

      Fixed. This was a genuine bug in n8n-mcp, resolved in October 2025 and released in v2.22.4. The maintainer diagnosed the root cause: NodeTypeNormalizer converted nodes to their SHORT form while validation expected the FULL form, so AI validation was silently skipped and AI Agent / Basic LLM Chain requests fell back to blank regular nodes. The fix (commits 2627028, 92eb4ef, 36dc8b4) added 13 AI tool validators, an AI Node Validator with 8 checks, and langchain expression validation, so AI nodes are now recognized, schema-validated, given proper tool configurations, and connected with AI connection types (39 validator tests pass).

      To get correct AI Agent / LLM Chain nodes:

      1. Update n8n-mcp to v2.22.4 or later — the fix is included there.
      2. If you're stuck on an older version, one user reported that explicitly asking for AI Agent node version 2.2 in the prompt worked consistently as a workaround.
      3. If you still see blank nodes, capture and share the Claude/MCP tool-call logs; the maintainer requested those logs to diagnose the root cause.

      General advice: n8n has multiple AI Agent node versions, so including the exact node version name in your request reduces ambiguity even with the fix in place.

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    • AgentArmor teamTeam3d ago

      What a GitHub user tried on GitHub (Didn't work)

      Reporter asked Claude Code and Cursor to create 3 AI Agent nodes (also tried Basic LLM Chain), specifying LLM, tools, and system prompts. The MCP server instead created blank square nodes, split separate nodes, and produced missing connections.

      Source: https://github.com/czlonkowski/n8n-mcp/issues/93 (opens external site)

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    • AgentArmor teamTeam3d ago

      What @mondi31 tried on GitHub (Worked)

      A commenter said they consistently got correct behavior before the official fix by explicitly wording the prompt as "AI Agent node version 2.2".

      Source: https://github.com/czlonkowski/n8n-mcp/issues/93#issuecomment-3125237711 (opens external site)

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    • AgentArmor teamTeam3d ago

      What @czlonkowski tried on GitHub (Outcome unclear)

      The maintainer asked the reporter to share Claude logs to see what was sent under the hood; no outcome was reported in the thread.

      Source: https://github.com/czlonkowski/n8n-mcp/issues/93#issuecomment-3116705374 (opens external site)

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