🔍 Swagger Navigator MCP Server

An MCP server implementation that provides intelligent discovery and search capabilities for Swagger/OpenAPI endpoints. This tool enables AI assistants to dynamically explore, understand, and interact with REST APIs by parsing OpenAPI specifications and providing fuzzy search across endpoints.

---

🚀 How It Works

The Swagger Navigator MCP Server acts as an intelligent API knowledge hub, seamlessly connecting developers with their API specifications. When you ask Cursor/Claude/LLMs to generate API clients, anticorruption layers, or type definitions, Cursor/Claude/LLMs consults the MCP server to get accurate, structured API information and then generates perfect code based on the actual API schema.

flowchart TD
    A[👨‍💻 Developer] -->|"💬 Generate API client<br/>for /users endpoint"| B[🎯 Cursor/IDE/LLMs]
    B -->|"🔍 Query: What is<br/>/users endpoint?"| C[🚀 Swagger Navigator MCP Server]
    C -->|"📊 Returns endpoint<br/>schema & structure"| B
    B -->|"✨ Here's your<br/>generated API client"| A

    style A fill:#74b9ff,stroke:#0984e3,stroke-width:2px,color:#fff
    style B fill:#a29bfe,stroke:#6c5ce7,stroke-width:2px,color:#fff
    style C fill:#ff6b6b,stroke:#333,stroke-width:4px,color:#fff

    linkStyle 0 stroke:#fd79a8,stroke-width:3px
    linkStyle 1 stroke:#00b894,stroke-width:3px
    linkStyle 2 stroke:#fdcb6e,stroke-width:3px
    linkStyle 3 stroke:#e17055,stroke-width:3px

---

✨ Features

• 🔍 Dynamic API Discovery: Automatically parse and index Swagger/OpenAPI specifications from multiple sources
• 🎯 Intelligent Search: Use fuzzy matching to find relevant endpoints based on natural language queries
• 🔗 Multi-source Support: Handle both local files and remote HTTP endpoints with authentication
• ⚡ Real-time Updates: Monitor configuration changes and refresh API data automatically
• 🔄 Hot-reload Configuration: Detect config file changes without server restart

---

🛠️ Tools

📋 list_all_sources

Retrieves a comprehensive list of all available Swagger/OpenAPI sources in the system.

Purpose:

• Provides overview of all loaded API specifications
• Shows available APIs for search and exploration
• Returns source names for use with other tools

Returns:

• Array of sources with name, description, and OpenAPI info (title, version)

📄 list_endpoints_for_source

Retrieves all endpoints from a specific API source with pagination support.

Inputs:

• name (string): The source name to list endpoints for
• limit (number, optional): Maximum endpoints to return (1-100, default: 10)
• offset (number, optional): Number of endpoints to skip (default: 0)

Returns:

• Array of endpoints with path, method, description, and metadata
• Pagination information with total count and navigation flags

🔎 search_endpoint

Intelligently searches endpoints using fuzzy matching across multiple attributes.

Inputs:

• query (string): Search query using natural language (e.g., "create user", "authentication", "GET users")

Returns:

• Ranked array of matching endpoints with relevance scores
• Weighted search across descriptions, paths, methods, and tags

---

⚙️ Configuration

🤖 Usage with Cursor

Add this to your ~/.cursor/mcp.json:

Using npx

{
  "mcpServers": {
    "swagger-navigator-mcp": {
      "command": "npx",
      "args": ["-y", "swagger-navigator-mcp"],
      "env": {
        "CONFIG_PATH": "path/to/swagger-navigator-mcp.config.yaml"
      }
    }
  }
}

📝 Configuration File

Create a swagger-navigator-mcp.config.yaml file:

# Swagger Navigator MCP Server Configuration

sources:
  # Local file example
  - name: "petstore-local"
    source: "./specs/petstore.json"
    description: "Local Petstore API specification"

  # Remote HTTP source with authentication
  - name: "github-api"
    source: "https://api.github.com"
    description: "GitHub REST API v3"
    headers:
      Authorization: "token ${GITHUB_TOKEN}"
      Accept: "application/vnd.github.v3+json"

  # API with custom headers
  - name: "internal-api"
    source: "https://internal.company.com/api/swagger.json"
    description: "Internal company API"
    headers:
      X-API-Key: "${API_KEY}"

# Optional: Search configuration
search:
  fuzzyThreshold: 0.6 # 0-1, lower = more fuzzy matching

# Optional: Refresh interval in seconds
refreshInterval: 300 # Refresh every 5 minutes

🔐 Environment Variable Substitution

The configuration file supports environment variable substitution using ${VARIABLE_NAME} syntax. This allows you to securely store sensitive information like API keys and tokens outside of your configuration file.

Examples:

• ${GITHUB_TOKEN} - Substituted with the value of the GITHUB_TOKEN environment variable
• ${API_KEY} - Substituted with the value of the API_KEY environment variable
• ${DATABASE_URL} - Any environment variable can be used

Note: If an environment variable is not set, the substitution will result in an empty string.

🌍 Environment Variables

Set environment variables for configuration and authentication:

export CONFIG_PATH="./swagger-navigator-mcp.config.yaml"
export GITHUB_TOKEN="your-github-token"
export API_KEY="your-api-key"

---

🚀 Usage

📦 Install Dependencies

npm install

🔨 Build the Project

npm run build

▶️ Start the Server

CONFIG_PATH=./swagger-navigator-mcp.config.yaml npm start

🧪 Development Mode

npm run dev

---

📄 License

This project is licensed under the ISC License - see the LICENSE file for details.