What Codna fixes.
Real engineering problems — fixed deterministically, verified by your own tests. One flow every time.
Use cases
Fix flaky tests
Flaky tests waste engineering hours and erode trust in CI. Codna does flaky test detection through the dependency graph — it finds the shared state, ordering, or timing cause deterministically, then fixes it and proves the test green.
From Sentry alert to fix PR
A production error in Sentry is a precise signal, not a vague bug report. Codna is an AI coding agent that turns the stack trace into a localized production bug fix — mapped deterministically, fixed from a tiny evidence bundle, verified by your tests, and opened as a PR.
Fix CI failures
A red pipeline blocks everyone behind it. Codna reads the failing job, maps what it touches deterministically, fixes the cause, and opens a pull request your own tests have already proven green.
Fix monorepo bugs
In a monorepo, a bug's cause often lives in a different package than the symptom. Codna maps the cross-package dependency graph deterministically, hands its AI coding agent a tight evidence bundle, and proves the patch with your tests — so a monorepo bug fix never quietly breaks a sibling package.
Fix bugs in legacy code
Old code nobody fully understands is risky to touch. Codna maps the whole repo deterministically in about 60ms, so a fix starts from the actual structure — not from someone's memory of how it used to work. It is the AI pair programmer that reads the legacy code for you before it changes a line.
Fix breakage from a dependency upgrade
A version bump turns green into red. Codna maps every call site the changed API touches deterministically, fixes the breaking changes from a tiny evidence bundle, and proves the build green again with your own tests.
Fix a security vulnerability
A scanner flags a CVE. The hard part is knowing where it reaches in your code. Codna traces the affected call paths deterministically, then ships a patch your own tests verify — AI vulnerability remediation without the guesswork.
Fix a regression
A regression means something that worked yesterday is broken today. The bug is not new code. It is old behavior that a recent change quietly took out, and Codna is the AI debugging tool that traces it back to the commit responsible.
Understand a new codebase
Joining an unfamiliar repo means reading for days before you trust a single change. Codna is an AI pair programmer that maps every symbol, dependency, and call path deterministically in ~60ms for 0 tokens — so codebase understanding starts from a real map of what calls what, not a wall of files.
