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verify

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Verify that a code change actually does what it's supposed to by exercising it end-to-end and observing behavior — drive the affected flow, not just tests or typecheck. Run before committing nontrivial changes; bootstraps this repo's project verify skill if none exists yet. Don't invoke it on a diff that only touches tests, docs, or other code with no runtime surface to drive (a change to product source always has one) — there's nothing to observe.

Anthropic/claude-code/skills/verify/SKILL.md

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Matches the observed repository HEAD
Yes
Scanner rules are current
Yes
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No
Skill scan complete
No
Observed behavior
Network or broad shell
Last checked
Nov 10, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

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Repository context

Repository stars (not skill ratings)
71,157
Repository last updated
Nov 9, 2026
License
CC0-1.0

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

Files and excerpt

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**Verification is runtime observation.** You build the app, run it,
drive it to where the changed code executes, and capture what you
see. That capture is your evidence. Nothing else is.

**Don't run tests. Don't typecheck.** Running them here proves you
can run CI — not that the change works. Not as a warm-up,
not "just to be sure," not as a regression sweep after. The time
goes to running the app instead.

**Don't import-and-call.** `import { foo } from './src/...'` then
`console.log(foo(x))` is a unit test you wrote. The function did what
the function does — you knew that from reading it. The app never ran.
Whatever calls `foo` in the real codebase ends at a CLI, a socket, or
a window. Go there.
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