mcp-server-builder

What This Skill Does

The mcp-server-builder skill acts as an automated bridge between your existing REST APIs and the Model Context Protocol (MCP). Instead of manually crafting tool wrappers, which are prone to human error and schema drift, this skill consumes OpenAPI specifications to generate production-ready MCP server code. It handles the mapping of API endpoints to MCP tool definitions, generates starter scaffolds in either Python or TypeScript, and provides a robust validation suite to ensure that your tool manifests meet the strict requirements of modern AI agent frameworks. By enforcing a single source of truth—the OpenAPI spec—it ensures that your agents always have the most accurate, documented, and type-safe interaction points possible.

Installation

To integrate this skill into your environment, use the OpenClaw installation command:

clawhub install openclaw/skills/skills/alirezarezvani/mcp-server-builder

Ensure you have the required Python dependencies installed to run the conversion and validation scripts provided within the repository.

Use Cases

• API Integration: Rapidly expose internal microservices or third-party REST APIs to LLM agents for task orchestration.
• Legacy Migration: Replace ad-hoc or brittle browser-based automation tools with stable, contract-based MCP tools.
• Standardization: Maintain a unified set of MCP servers across multiple development teams, ensuring consistent naming, error handling, and authentication practices.
• Production Hardening: Use the built-in validator to catch common issues like missing schema descriptions, redundant tool naming, or malformed parameter structures before deploying to production environments.

Example Prompts

1. "Generate a Python-based MCP server scaffold from this openapi.json file located in my current directory, naming the server 'inventory-service'."
2. "Validate the tool_manifest.json in the './build' folder using strict mode to ensure all tool parameters are correctly documented and compliant with MCP specs."
3. "Create a TypeScript MCP server boilerplate for the user-management-api and ensure that all sensitive authentication headers are excluded from the tool schema definitions."

Tips & Limitations

• Tip: Always favor the use of the validator tool before committing new schema versions to your version control system.
• Tip: When migrating from REST to MCP, define clear error objects in your OpenAPI specs to help agents understand recovery steps when an API call fails.
• Limitation: The skill relies heavily on the quality of the provided OpenAPI specification; if the source contract is vague or incomplete, the generated MCP tools will require manual refinement.
• Limitation: While the skill generates scaffolding, it does not automatically handle the implementation of authentication logic; you must manually configure secure secret retrieval from your environment variables.