bugstack closes the loop on production runtime errors. The SDK captures exceptions the moment they're thrown, pulls full stack-trace context, generates a targeted fix, validates it through your existing CI pipeline, and delivers a tested pull request — end-to-end in under two minutes. Scope is deliberately narrow: stack-trace-anchored runtime errors that fit in ≤3 files, ≤30 lines, with zero new dependencies. That's roughly 40–60% of production bug volume in typical SaaS codebases — TypeErrors, null/undefined access, NoneType errors, NoMethodError on nil, Go nil-pointer panics, unhandled async failures, local import mismatches, and small guard fixes. Logic errors, architectural problems, and dependency upgrades stay with your engineers. Every fix runs through your CI before merge. You choose: manual review on every PR, or auto-merge above a confidence threshold. Security-sensitive paths (auth, crypto, input sanitization) always require a human. One CI retry, then stop — no infinite loops. Languages: JavaScript, TypeScript, Python, Ruby, Go. Frameworks: Express, Next.js, Flask, FastAPI, Django, Rails. Two-line SDK install, async/non-blocking, fingerprinted, rate-limited by default.