verify

A skill for checking a code change by running the actual application and observing the affected behavior. It treats runtime evidence as the proof, rather than relying on tests or type checking alone.

In plain words
What is it for?
Use it to build, launch, and exercise the changed part of a command-line tool, server, or graphical application before committing.
Why use it?
A passing test or type check does not always show that users can complete the real flow. This approach finds problems that appear only when the application is running.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/pleaseai/run-verify-plugin/verify
Any agent
npx skills add pleaseai/run-verify-plugin --skill verify
Clone the repo
git clone --depth 1 https://github.com/pleaseai/run-verify-plugin

Made for: Claude Code, Codex.

Per session 95 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,988 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin 97% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00095 $0.02988
Opus 5 $0.00048 $0.01494
Sonnet 5 $0.00019 $0.00598
Haiku 4.5 $0.00010 $0.00299

Measured 2d ago against content hash 4c2bc58caacc, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

verify scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Enumerates other installed skillsmediumAgent snooping

Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.

ls .claude/skills/ .agents/skills/ # repo root
Origin

This is a copy

97% identical to verify — 66 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/verify/SKILL.md · 269 lines

How it starts

The opening of the file, as written. The whole thing — 269 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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.

Find the change

The scope is what you're verifying — usually a diff, sometimes just "does X work." In a git repo, establish the full range (a branch may be many commits, or the change may still be uncommitted):

git log --oneline @{u}..              # count commits (if upstream set)
git diff @{u}.. --stat                # full range, not HEAD~1
git diff origin/HEAD... --stat        # no upstream: committed vs base
git diff HEAD --stat                  # uncommitted: working tree vs HEAD
gh pr diff                            # if in a PR context

State the commit count. Large diff truncating? Redirect to a file then read it. Repo but no diff from any of these → say so, stop. No repo → the scope is whatever the user named; ask if they didn't.

The diff is ground truth. Any description is a claim about it. Read both. If they disagree, that's a finding.

Surface

The surface is where a user — human or programmatic — meets the change. That's where you observe.

Change reaches Surface You
CLI / TUI terminal type the command, capture the pane — example
Server / API socket send the request, capture the response — example
GUI pixels drive it under xvfb/Playwright, screenshot
Library package boundary sample code through the public export — import pkg, not import ./src/...
Prompt / agent config the agent run the agent, capture its behavior
CI workflow Actions dispatch it, read the run

Read the full file on GitHub · 269 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 269 lines · 95 tokens per session scan B 4c2bc58caacc

Subscribe to this mod's changes

verify is a skill published in the GitHub repository pleaseai/run-verify-plugin (1 stars, last pushed 2mo ago), licensed MIT. It adds 95 tokens to every session and 2,988 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B with 1 finding (enumerates other installed skills). It is 97% identical to verify, differing in 66 lines, and is treated as a copy.

Related

Other skills, from other repositories