Interactive SimulatorJSON-RPC 2.0

MCP Protocol Playground

Simulate protocol handshakes (initialize), discover schemas (tools/list), test resource streaming, and inspect tool execution payload responses directly in your browser.

Protocol Spec Export Config

1. Select Server:

2. Protocol Method:

3. Target Tool:

JSON-RPC 2.0 Request Payloadmethod: tools/call

stdio > STDIN stream

{
  "jsonrpc": "2.0",
  "id": 51178,
  "method": "tools/call",
  "params": {
    "name": "create_issue",
    "arguments": {
      "owner": "facebook",
      "repo": "react",
      "title": "Improve SSR hydration error telemetry",
      "body": "Requesting more descriptive diagnostics during selective hydration failures."
    }
  }
}

Server Response Payload

stdio < STDOUT frame200 OK

Click "Execute JSON-RPC Dispatch" to inspect simulated server response.