Summary
This is your guide when you need to build an MCP server that lets LLMs talk to external APIs. It walks through the full workflow: researching the MCP spec and SDK docs, planning which API endpoints to expose as tools, implementing with proper schemas and error handling, and creating evaluations to test if LLMs can actually use what you built. Recommends TypeScript with streamable HTTP transport for remote servers, emphasizes comprehensive API coverage over custom workflows, and includes concrete advice on tool naming, pagination, and structured outputs. The evaluation section is especially useful since it forces you to prove your server works by creating ten complex, realistic questions that require multiple tool calls to answer.
Install to Claude Code
npx -y skills add syahiidkamil/software-engineer-ai-agent-atlas --skill mcp-builder --agent claude-codeInstalls into .claude/skills of the current project.
Agent, run crypto. Access onchain data & trade routes via 1inch.
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Featured
Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →An agent that runs the SEO playbooks that move rankings and ships PRs you control.
Get founding access →Connect Claude to +800M contacts, +150M companies. Find & Enrich leads in chat.
Try For Free →First SeenJun 11, 2026
