DevTools

So you spend an hour wiring up an MCP server. Your Claude Code client connects fine — no errors. But when you ask it to use a tool, nothing happens. Or worse, it calls the tool with arguments that look weird, and you have no idea why. That’s the blind spot. The MCP Inspector is a standalone test client — it can’t see what your real client is actually sending. You’re debugging in the dark. ...

Your CLAUDE.md is probably broken right now. And you have no idea. Vercel’s research found that skills invoke at a stunning 0% rate when the syntax is off by even a single field. One wrong name format — poof, your entire skill is invisible. I’ve been there: spent an afternoon debugging why Claude wasn’t picking up a carefully crafted review skill, only to find a trailing space in a YAML key. Hours gone because of a whitespace character. ...