Cursor · MCP testing
Test how Cursor calls your MCP tools.
Cursor decides which tool to call and what to do with the result. In Cursor, the model sees images returned via direct content, embedded resources, and linked resources. MCPJam runs your server through Cursor with anthropic/claude-sonnet-4.5 so you see the real tool calls instead of guessing from a bug report.
npx @mcpjam/inspector@latestHow Cursor handles your tool results
Image results
Images reach the model via direct content, embedded resources, and linked resources. That covers every shape we track.
Emulation model
MCPJam drives Cursor with anthropic/claude-sonnet-4.5, so tool selection reflects this host, not a generic model.
Extensions
Cursor advertises io.modelcontextprotocol/ui.
See the call
Trace shows every step from prompt to response with timings. The exact tool, the exact arguments.
Score it
Evals run realistic requests through Cursor and score whether the right tool was picked with the right arguments.
How we know
Probed: Verified by running against the client. Last reviewed 2026-07-08.
Walkthrough: Cursor
Run npx @mcpjam/inspector@latest, connect the MCP server config you already use, and select Cursor as the host. MCPJam emulates Cursor with anthropic/claude-sonnet-4.5 on desktop, so what you see is this host's behavior, not a generic client's.
Ask for something in natural language and watch which tool Cursor picks and with what arguments. Open Trace for the timed step-by-step, then turn the recurring cases into an eval suite so a regression fails the gate instead of your users.
Frequently asked questions
Run npx @mcpjam/inspector@latest, connect your server, and select Cursor. MCPJam emulates the host with anthropic/claude-sonnet-4.5, so you can watch the real behavior locally, free and open source.
In Cursor, images reach the model via direct content, embedded resources, and linked resources. (Catalog last reviewed 2026-07-08.)
MCPJam's host-compat catalog (the same data behind caniuse.dev). Probed: Verified by running against the client. Last reviewed 2026-07-08.
See it in Cursor before your users do.
One command, your existing server config, Cursor's real behavior in the loop.
Open source · no credit card · ~2 min