StackBridge-MCP Tool Detects Full-Stack Contract Breaks AI Agents Miss in 0.75ms

AI coding agents like Cursor, Claude Code, and Windsurf can silently break frontend applications when they modify backend API routes or data models, even when backend unit tests continue to pass. A developer has released StackBridge-MCP, an open-source Model Context Protocol server designed to catch these cross-boundary contract failures without running heavy test environments. The tool uses Tree-sitter AST parsing to map dependencies between Next.js frontends, FastAPI routes, and SQLAlchemy models, storing relationships in a SQLite database for fast traversal. Benchmarked on a 44-file FastAPI project, it reduced context window usage by 99.74% and performed dependency traversal in 0.75 milliseconds compared to roughly 150 milliseconds for a full-repo search. StackBridge-MCP is available on GitHub and PyPI and can be run immediately via a single uvx command with no local configuration required.