I Built AgentCheck Because “The Coding Agent Said Done” Wasn’t Enough

I Built AgentCheck Because “The Coding Agent Said Done” Wasn’t Enough AI coding agents are getting surprisingly good at writing code. I use them regularly, and they can handle increasingly large tasks: refactoring code, adding features, updating dependencies, modifying configuration, creating migrations, and touching files across an entire repository. But I kept running into the same problem after the agent finished: How do I independently verify what it actually changed? The agent usually gives me a perfectly reasonable summary. Something like: Done. Implemented the requested changes, updated the tests, and cleaned up the affected code. Useful? Absolutely. Enough for me to commit without checking? Not really. So I built AgentCheck . The Problem Happens After “Done” After a coding agent finishes a task, I still find myself manually checking things like: Which files actually changed? Were any files deleted? Did configuration change? Were dependencies added or updated? Was a database migration introduced? Did anything that looks like a secret appear? Were related tests changed? Is the overall change set larger or riskier than expected? Of course, Git already gives us the raw information. I can run: git status git diff git diff --stat Then inspect individual files. And I still do that. But once coding agents become part of your normal workflow, repeating the same verification process after every task starts to feel like something that should be structured. That was the idea behind AgentCheck. What AgentCheck Does AgentCheck creates a trusted checkpoint before your coding agent starts working. Then, after the agent finishes, it compares the current Git-visible repository state with that checkpoint. The basic workflow is deliberately small: agentcheck start Then let your coding agent work. That can be: Codex Claude Code Cursor another AI-assisted coding tool or technically even a human When the work is finished: agentcheck AgentCheck then produces four sections: Changes