Open source alternatives to mcp-builder

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mcp-builder

Guide for creating high-quality MCP

mcp-builder is an agent skill from Composio's Awesome Claude Skills collection on GitHub. It is a guide to building good MCP (Model Context Protocol) servers that let AI models use outside services through well-designed tools, in Python with FastMCP or in TypeScript with the MCP SDK. It walks from research and planning through implementation, review and evaluation. A skill is a SKILL.md file of instructions (sometimes with scripts and reference notes) that an AI agent loads only when a task calls for it, so the agent knows the steps to follow and what to avoid. It is free and open source.