Hey, thanks for the report. Your observations are spot on. This is a known issue with discovery MCP tools in agent mode.
What’s happening: the MCP server connects fine and the tools get registered (you can see it in the logs, like “Found 5 tools”), but the agent only sees ListMcpResources and FetchMcpResource (for resources), not the actual tools. The bug showed up somewhere between versions 2.3.34 and 2.3.41.
Try these workarounds:
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New chat + explicit request: Open a new chat and ask “list all MCP tools you have access to”. After that, tools might start working in the same session.
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Update to 2.4: A lot of users confirmed it works there: Downloads | Cursor Docs
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Restart Cursor after setting up MCP or explicitly mention the server name (for example “use SQLcl-MCP”). This helps some users.
Related threads with the same bug:
- Agent chat "No MCP resources available" when trying to use MCP
- MCP SSH Tools Not Available in AI Assistant Context (Regression After Latest Update)
If the workarounds don’t help, send the Request ID from the broken chat (three dots in the top right of the chat > Copy Request ID). This will help the team with debugging.