Engineering

MCP Server Tester

Paste the URL of a live MCP (Model Context Protocol) server using the Streamable HTTP transport, and this tool connects to it, runs the initialize and tools/list calls, and shows exactly which tools it exposes and their descriptions, handy for debugging your own server or checking one before connecting it to an agent.

  • Free to use
  • No sign-up
  • Instant results

Streamable HTTP endpoint. Only initialize and tools/list are called.

Server response
Your result will appear here Paste a URL and press Enter

How it works

  1. 01 Paste the URL of your MCP server (Streamable HTTP transport).
  2. 02 The tool sends an initialize call, then tools/list.
  3. 03 Review the server info and the full list of exposed tools.
  4. 04 Fix and re-test until your server responds as expected.

Frequently asked questions

The Streamable HTTP transport (JSON-RPC 2.0 over a single HTTP endpoint). Stdio-based local servers can't be tested from a hosted web tool.

Common causes: the server requires auth headers this tool doesn't send, it only supports stdio, or it isn't a valid MCP endpoint. Check your server logs for the incoming request.

The tool only calls initialize and tools/list, both read-only, standard MCP calls. It doesn't call or execute any of the listed tools.

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