Fix bugs with a coding agent
Hand a failing test or error log to an agent and get a reviewed fix.
Best tools for this
1 Claude Code · Included in Claude Pro ($20/mo billed monthly, $17/mo billed annually); Max from $100/mo
Terminal agent that reads the repo, runs tests and iterates on fixes.
3 Aider · Free, open source (Apache-2.0); pay for your own LLM API
Open-source, git-native option if you want to bring your own model.
Provisional editorial picks, not yet hands-on tested for this exact task.
Starter prompt
Here is the error: [paste]. Reproduce it first with a failing test, find the root cause, make the smallest fix, run the test suite, and summarize what changed and why.