Cursor refuses to use my MCP server

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21

Ah I see, that makes sense, tagging with @ would really help use a specific tool. Doesnt it work if you just mention the mcp and tool? it should.

22

I got it working by telling Cursor not to use curl and also prompted “you are the Cursor IDE and you can connect to locally running MCP servers”

1 Like
23

I found at least 1 issue where something goes wrong with claude for mcp calls with no parameters, can add this rule which might help on some situations - not sure if this is the real reason its failing its hard to get it to be honest about what is going on :slight_smile:

  • MCP Tool usage requirements *
    MCP Tool Rule:
    For tools with only optional parameters: Always provide at least one parameter explicitly. Never call with empty {} or no parameters.
    Example:
    :white_check_mark: 100
    :cross_mark:
    This prevents JSON serialization failures in MCP implementations.
24

thanks that fixed it for me, wasn’t in agent mode

25

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