A verification command that runs an application's acceptance-test harness and explains the results. Acceptance criteria are the conditions a solution must satisfy for the work to count as complete.

Checking challenges against a running application, testing web interfaces with Playwright, and explaining failed or skipped criteria.

It turns passing, failing and skipped checks into an explanation of what actually happened, including missing prerequisites and likely causes.

How micheltlutz/dev-challenge configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to micheltlutz/dev-challenge. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/micheltlutz/dev-challenge/main/.claude/commands/verify.md

Clone the repo

git clone --depth 1 https://github.com/micheltlutz/dev-challenge

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/commands/micheltlutz/dev-challenge/verify/github.svg)](https://agentmods.dev/commands/micheltlutz/dev-challenge/verify)

Your own site

<a href="https://agentmods.dev/commands/micheltlutz/dev-challenge/verify"><img src="https://agentmods.dev/badge/commands/micheltlutz/dev-challenge/verify/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/commands/micheltlutz/dev-challenge/verify"><img src="https://agentmods.dev/badge/commands/micheltlutz/dev-challenge/verify.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 483 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found 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.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.00483
Opus 5.5	$0.00000	$0.00193
Sonnet 5.5	$0.00000	$0.00097
Haiku 4.5	$0.00000	$0.00048

Measured 2mo ago against content hash d1dd2068801f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

verify scanned grade A 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 2mo 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

allowed-tools: Read, Grep, Glob, Bash(python harness/cli.py:*), Bash(pytest harness/:*), Bash(curl:*)

.claude/commands/verify.md · 56 lines

What it actually says

Verify a solution against its acceptance criteria.

Work out the target

Default --base-url is http://localhost:8000. If $ARGUMENTS names a challenge or a URL, use those. If you do not know where their app is running, ask — do not guess and report a connection error as a failure.

python harness/cli.py --base-url <url> --challenge <id>

Omit --challenge to run everything.

For the web track the runner is Playwright:

cd harness/ui/web && BASE_URL=<their-frontend> npx playwright test

Explain the scorecard

Do not paste the raw output and stop. For each failing criterion:

Quote the criterion — its ID and its Given/When/Then.
State what actually happened.
Point at the likely cause, in their code if you can see it.
Ask what they think is going on, before giving the fix. Default posture is mentoring; see AGENTS.md.

For each skipped criterion, explain that a skip is not a pass and name the missing prerequisite:

Skip	Meaning
"Could not register a user"	`backend-02-create-user` is missing
"Could not authenticate"	`backend-03-login` is missing
"Reference seed data not present"	needs two users matching the fixture
"Cannot create statements"	`POST /statement/` is missing
"GET /users/me returned 404"	the client cannot learn its own id

Ignore uncovered criteria unless they ask — those are UI or manual-review items the API harness cannot reach, not something they did wrong.

Close

One line on where they stand — "6 of 7, and the last one is the scoping rule" — and what to do next. If everything passes, say so without padding, and point at /next.

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.

2mo ago First seen · 56 lines · 0 tokens per session scan A d1dd2068801f

Subscribe to this mod's changes

verify is a command published in the GitHub repository micheltlutz/dev-challenge (33 stars, last pushed 5d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 483 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Mobile challenge development fastapi front-end front-end-challenge

verify next to 6 commands from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
verifymicheltlutz/dev-challenge	Command	33	5d ago	MIT	A	0	Claude Code
firefabriqaai/specs.md	Command	225	3d ago	MIT	A	13	Claude Code
toolsfirst-fluke/fullstack-starter	Command	225	3d ago	MIT	A	18	GitHub Copilot
os-meetingCronusL-1141/AI-company	Command	374	10d ago	MIT	A	12	Claude Code
erne-animateJubaKitiashvili/everything-react-native-expo	Command	50	29d ago	MIT	A	21	Claude Code
react-nativegetsentry/toolkit	Command	957	yesterday	none	A	0	Claude Code
app-store-auditmjmirza/app-store-compliance	Command	403	yesterday	none	A	35	Claude Code

dev-challenge: Command for Claude Code