mcp-builder

Guide for building high-quality MCP servers that enable LLMs to interact with external services via well-designed tools.

• MCP servers let LLMs access external services through tools
• Designed for agent-centric, workflow-driven task execution
• Enables LLMs to perform real-world tasks using external APIs
• Supports Python (FastMCP) and Node/TypeScript (MCP SDK)

• Build tools for workflows, not just API endpoints
• Optimize for limited agent context and token budget
• Design actionable, educational error messages
• Follow natural task subdivisions and naming conventions
• Use evaluation-driven development with real agent feedback
• Implement shared utilities and error handling early
• Prioritize high-impact, common use-case tools
• Ensure consistent input/output formats and error handling

1. 1.Conduct deep research and planning on agent design principles
2. 2.Study MCP, framework, and API documentation thoroughly
3. 3.Create a detailed implementation plan with tool selection and error handling
4. 4.Set up project structure and implement shared utilities first
5. 5.Develop tools systematically with proper input/output schemas
6. 6.Test and refine tools based on agent performance and feedback