Claude Code /verify: Confirm AI-Fixed Code Really Works via Build and Run

"The AI says it fixed everything... but does it really work?" This doubt always follows you when doing vibe coding (a coding style of handing it to the AI to build quickly). It's uneasy to just trust the claim that code was changed. Claude Code (an AI coding tool used in the terminal) doesn't end with just words — it actually runs it and confirms. That's /verify.

Definition (What It Is)

/verify is a command that builds, runs, and observes the app to confirm the changes work as intended.

• Build: the process of turning written code into an actually running program. If an error occurs here, it's a sign the code has a problem.
• Run: actually running the built program.
• Observe: examining whether the result of running it comes out as desired.

In other words, it's a finishing step that doesn't stop at the claim "it's fixed" but actually runs it and confirms the result.

How to Use It (By Difficulty)

Basic — Verify Changes

/verify

Running it builds and runs the app to observe the results. It confirms whether the changed feature actually works and whether the build hasn't broken.

Common Pitfalls (When Applicable)

• A "pass" from /verify doesn't mean every feature is perfect. Verification usually checks mainly the changed parts, so it's safest for a person to also try important features once more.
• For projects that need environment setup to build or run (e.g., environment variables, installing dependencies), verification may not run properly if that prep isn't done. Have the basic run environment ready in advance.

Real-World Example

After adding a new feature, you run /verify. You wouldn't have known if you'd just trusted the AI's word, but confirming through an actual build and run lets you see with your own eyes that the feature works properly and wrap up with peace of mind.

Taking It Further

If you make a habit of running /verify right after fixing code, you can catch problems early. For more important changes, going through two steps — confirming behavior with /verify, then checking code quality with /code-review — gives reassurance.

Summary

/verify is a command that builds, runs, and observes changed code to confirm it really works as intended. It's a reliable finishing step that eases the "does it really work?" anxiety by confirming behavior directly.

Based on: Claude Code v2.1.154 (2026.05)