sncro

sncro is a lightweight MCP relay and framework plugin system that lets AI coding assistants (Claude Code, Cursor, Copilot) inspect a live browser during development. Instead of asking you for screenshots, Claude calls MCP tools to query the DOM, read console logs, check network timing, or pull a page snapshot — all against your actual running app. Drop-in middleware for FastAPI and Flask today; Django, Express, Next.js, Rails welcome as community PRs. Debug-only (zero code in production). Free tier + hosted relay at relay.sncro.net, or self-host from the MIT-licensed source.