Swagger Doc Explorer MCP

MCP server for progressive exploration of Swagger/OpenAPI documentation. Supports stdio (local) and HTTP (remote) transports.

Each loaded spec is identified by a unique name ({title} v{version}) assigned at load time. All downstream tools reference the spec by name, so you can load and inspect multiple specs simultaneously.

Tools

| Tool | Description | |------|-------------| | swagger_load_spec | Load spec from a remote URL. url (required), auth_header (optional). Returns the assigned spec_name | | swagger_load_local_spec | Load spec from a local JSON file. file_path (required). Returns the assigned spec_name | | swagger_list_loaded | List all specs currently loaded (name, title, version, source) | | swagger_remove_spec | Remove a loaded spec from memory. spec_name (required) | | swagger_get_info | Get API title, version, description, server URL. spec_name (required) | | swagger_list_tags | List all tags/groups with endpoint counts. spec_name (required) | | swagger_list_paths | List endpoints, optionally filtered by tag. Supports limit (default 50) and offset pagination. spec_name (required) | | swagger_get_endpoint | Drill into a specific endpoint: path, method. spec_name (required) | | swagger_get_endpoint_full | Drill into endpoint with all $ref recursively resolved. Single-call completeness | | swagger_list_schemas | List all data models/schemas. Supports limit and offset. spec_name (required) | | swagger_get_schema | Get full details of a specific schema: schema_name. spec_name (required) | | swagger_search | Full-text search across endpoints and schemas: query. spec_name (required) |

Installation

npm install -g swagger-doc-explorer-mcp

Or use directly with npx (no install needed):

npx -y swagger-doc-explorer-mcp

Usage

stdio (default)

npx -y swagger-doc-explorer-mcp

HTTP

SWAGGER_HTTP_PORT=3000 npx -y swagger-doc-explorer-mcp

The HTTP server accepts POST requests at / following the MCP Streamable HTTP protocol. Clients must include Accept: application/json, text/event-stream and use the mcp-session-id header for session affinity:

# Initialize session
curl -X POST http://localhost:3000/ \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"my-client","version":"1.0"}}}'

# Copy the mcp-session-id from response headers, then:
curl -X POST http://localhost:3000/ \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -H "mcp-session-id: <session-id>" \
  -d '{"jsonrpc":"2.0","method":"notifications/initialized"}'

curl -X POST http://localhost:3000/ \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -H "mcp-session-id: <session-id>" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"swagger_load_spec","arguments":{"url":"https://petstore.swagger.io/v2/swagger.json"}}}'

Development

npm run dev          # stdio mode with hot reload
npm run dev:http     # HTTP mode on port 3000 with hot reload

MCP client configuration

Use npx so the client auto-installs the package:

Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "swagger-doc-explorer": {
      "command": "npx",
      "args": ["-y", "swagger-doc-explorer-mcp"]
    }
  }
}

VS Code (.vscode/mcp.json):

{
  "servers": {
    "swagger-doc-explorer": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "swagger-doc-explorer-mcp"]
    }
  }
}

If installed globally, use swagger-doc-explorer-mcp directly as the command.

opencode (~/.config/opencode/opencode.json):

{
  "mcp": {
    "swagger-doc-explorer": {
      "type": "local",
      "command": ["npx", "-y", "swagger-doc-explorer-mcp"],
      "enabled": true
    }
  }
}

Environment Variables

| Variable | Description | |----------|-------------| | SWAGGER_HTTP_PORT | Set to enable HTTP mode (e.g. 3000). Omit for stdio mode |

Progressive Exploration Workflow

1. swagger_load_spec / swagger_load_local_spec  → load the API spec (returns spec_name)
2. swagger_get_info(spec_name="...")             → overview of the API
3. swagger_list_tags(spec_name="...")            → see available groups
4. swagger_list_paths(spec_name="...", tag="users") → browse endpoints in a group
5. swagger_get_endpoint(spec_name="...", path, method) → drill into endpoint details
6. swagger_list_schemas(spec_name="...")         → see available data models
7. swagger_get_schema(spec_name="...", schema_name) → inspect a model
8. swagger_search(spec_name="...", query)        → find anything across the spec

Multiple specs can be loaded and queried simultaneously — each identified by its unique spec_name.

Compatibility

OpenAPI v3.x (openapi field)
Swagger v2 (swagger field)
JSON format only (YAML is not supported)
Remote URLs and local file paths

Build & Test

npm run build
npm test

MCP Servers