Openapi MCP

An MCP server that lets LLMs inspect and interact with OpenAPI specifications.

GitHub

OpenAPI MCP Server

An MCP server that lets LLMs inspect and interact with OpenAPI specifications.

Features

Load OpenAPI specs from URL or file (OpenAPI 2.0 & 3.x)
List and search endpoints
Get request/response schemas (fully dereferenced)
Validate payloads against schemas
Generate sample request payloads
Generate TypeScript types from schemas
Extract authentication schemes

Installation

Via npm (recommended)

npm install -g @blackkspydo/openapi-mcp

Or run directly with npx:

npx --yes @blackkspydo/openapi-mcp

From source

git clone https://github.com/blackkspydo/openapi-mcp.git cd openapi-mcp bun install bun run build

Usage

With Claude CLI

claude mcp add openapi-mcp -- npx --yes @blackkspydo/openapi-mcp

With Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{ "mcpServers": { "openapi-mcp": { "command": "npx", "args": ["--yes", "@blackkspydo/openapi-mcp"] } } }

Or if installed globally:

{ "mcpServers": { "openapi-mcp": { "command": "openapi-mcp" } } }

Standalone

openapi-mcp

or

npx --yes @blackkspydo/openapi-mcp

Available Tools

Tool	Description
load_spec	Load an OpenAPI spec from URL or file
list_endpoints	List all endpoints with optional filtering
search_endpoints	Search endpoints by keyword
get_endpoint_details	Get full details for an endpoint
get_request_schema	Get request body schema
get_response_schema	Get response schema by status code
validate_payload	Validate JSON against schema
generate_sample	Generate sample request payload
generate_typescript_types	Generate TypeScript interfaces from schemas
generate_curl	Generate ready-to-use cURL command
get_auth_schemes	Get security schemes
get_servers	Get available API servers

Example

You: Load the Petstore API spec from https://petstore.swagger.io/v2/swagger.json

You: List all POST endpoints

You: Generate TypeScript types for the Pet schema

You: Generate a cURL command for POST /pet

You: Generate a sample request for POST /pet

License

MIT

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