Hey @everyone, I’m stuck with a strange MCP issue and could really use someone’s help I have an MCP tool that points to my n8n MCP server (SSE, Bearer auth). The tool is attached to my assistant and shows up correctly under Tools. In the system prompt I explicitly tell the model when to call it “ What’s happening: • The assistant answers normally to the trigger phrase but no tool call ever shows up in the Call Transcript (no MCP block at all), • and no new execution appears in n8n. So it looks like the assistant doesn’t even attempt to call the tool. Important context: • This used to work perfectly. • The problem started after I duplicated some assistants and accidentally connected them all to the same MCP tool/server. • Since then I’ve cleaned everything up: created fresh assistants and a new MCP tool with a new server URL + API key, removed old tools, republished, etc. • Despite that, the new assistants still never call the MCP tool. Any idea what could cause an MCP tool to simply never be invoked (even with explicit instructions), or anything I should check/reset (caching, hidden config, known issues)? Thanks in advance.

Hi, could you provide me with the Call ID where this tool not triggering issue was happening? This will help me review the logs and find any issues.

019bb992-4734-7886-a5aa-eb6f7b4f373b

Hi, I reivewed the logs for that call. It looks like the tool was not mapped properly. Could you try removing the tool, save the assistant. and then try adding the tool back? This should hopefully fix the issue.