MCP Tester

Try the MCP server in your browser.

Sends real JSON-RPC 2.0 requests to /api/mcp. Pick a method, fill in arguments, and inspect the response.

Want config snippets for Claude / Cursor / Cline / Windsurf? See /mcp-docs.

Method

Request body

POST /api/mcp

{
  "jsonrpc": "2.0",
  "method": "initialize",
  "params": {
    "protocolVersion": "2024-11-05",
    "capabilities": {},
    "clientInfo": {
      "name": "mcp-test",
      "version": "1.0"
    }
  },
  "id": 1778602441865
}

Response

Idle

Pick a method and click Send.

Tips

Start with initialize. A real client must send it first; this tester sends each call independently.
tools/call results come back as a content array of { type: "text", text } entries. Parse the text field as JSON.
resources/list returns all 278 entries — that's a big payload.
evaluateFit is the slowest call (an LLM round-trip). The others should return in under 200 ms.