Closing the loop with devtools-proxy

Here's the failure mode I want to retire.

Agent writes a Vue component. The diff looks correct — props are typed, logic is right, template reads sensibly. Agent says "done." User reloads the page. Panel is blank. Console has a hydration mismatch.

This isn't a prompting problem. The agent did everything it could from inside its sandbox. The real problem is that the sandbox doesn't include the running app. devtools-proxy-mcp fixes that.