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The Best API Documentation Tool MCP server

Which servers in the official MCP registry are The Best API Documentation Tool's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-20

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Whose server it is
  • Registry namecom.redocly/mcpverified in the MCP registry

The registry name sits under redocly.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-20
  • Stateanswerschecked 2026-10-20
  • Tools3
  • Server calls itselfRedocly
  • Server version0.1.19
  • Protocol version2025-06-18

On 2026-10-20 the server answered initialize and tools/list without a sign-in. First answer in 995 ms.

Should an agent connect itSkip it
  • Its tools do none of the product's use cases we checked: Lint API definitions against configurable rules; Monitor API health with alerts by email or Slack.
  • Checked on 3 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 3, the first on 2026-10-20
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 3 so far
  • What an agent can do with it0 of 2 use cases
  • Use1 GitHub stars
  • Answeredmeasuring3 of the 7 daily checks it takes to print a share
  • Median first answer989 ms
  • Space in an agent's context≈ 955 tokensthe definitions of all its tools (3), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results2 of 3 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • not sure · Generate API reference docs from OpenAPI definitions
  • cannot · Lint API definitions against configurable rules
  • cannot · Monitor API health with alerts by email or Slack

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers3 tools · read 2026-10-20
  • execute

    Run JavaScript in a sandbox against the documentation at https://redocly.com. The script calls the sandbox functions on the global `site` object. The only extra global is `site` - there is no `fetch`, `console`, `setTimeout`, `require`…

  • discover

    Get the exact TypeScript signatures of the sandbox functions that `execute` scripts can call. Analyze the user request first, then pass `names` with only the functions the request needs (every name is listed in this input schema /…

  • submit-feedback

    Report a documentation page that is wrong or incomplete. Use it when the user reports a problem with a page on this site, or agrees to report a problem that you found. Do not use it for product bugs or support questions.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "redocly": {
      "type": "http",
      "url": "https://redocly.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http redocly https://redocly.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://redocly.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.