Explore any public OpenAPI spec — get overview, endpoints, and operation details via openapi-mcp-server (npx)

{
  "server": "npx -y openapi-mcp-server",
  "transport": "stdio",
  "protocol_version": "2024-11-05",
  "tools_found": 2,
  "tool_names": ["getApiOverview", "getApiOperation"],
  "trace": [
    {
      "step": "getApiOverview",
      "request": {
        "name": "getApiOverview",
        "arguments": {
          "id": "openai"
        }
      },
      "response_excerpt": "# openai OpenAPI overview

> Below is an overview of the openai openapi in simple language. This API contains 271 endpoints.

OpenAI API v2.3.0 - https://api.openai.com

## Assistants
- listAssistants: Returns a list of assistants.
- createAssistant: Create an assistant...

## Audio
- createSpeech: Generates audio from the input text.
- createTranscription: Transcribes audio..."
    },
    {
      "step": "getApiOperation",
      "request": {
        "name": "getApiOperation",
        "arguments": {
          "id": "openai",
          "operationIdOrRoute": "createSpeech"
        }
      },
      "response_excerpt": "openapi: 3.1.0
info:
  title: OpenAI API
  version: 2.3.0
paths:
  /audio/speech:
    post:
      operationId: createSpeech
      tags: [Audio]
      summary: Generates audio from the input text.
      requestBody:
        content:
          application/json:
            schema:
              properties:
                model: {enum: [tts-1, tts-1-hd, gpt-4o-mini-tts]}
                input: {type: string, maxLength: 4096}
                voice: {enum: [alloy, ash, ballad, coral, echo, sage, shimmer, verse]}
                response_format: {enum: [mp3, opus, aac, flac, wav, pcm]}
                speed: {type: number, minimum: 0.25, maximum: 4.0}"
    }
  ],
  "failure_cases": [
    {
      "input": {
        "id": "petstore3.swagger.io"
      },
      "error": "API error: No OpenAPI found at petstore3.swagger.io",
      "note": "Domain names don't work — use oapis.org shorthand identifiers or direct URLs to raw spec files"
    }
  ]
}