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.
npx skills add Owl-Listener/designpowers --skill verification-before-shippinggit clone --depth 1 https://github.com/Owl-Listener/designpowersWrote 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.
[](https://agentmods.dev/skills/owl-listener/designpowers/verification-before-shipping)<a href="https://agentmods.dev/skills/owl-listener/designpowers/verification-before-shipping"><img src="https://agentmods.dev/badge/skills/owl-listener/designpowers/verification-before-shipping/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.
<a href="https://agentmods.dev/skills/owl-listener/designpowers/verification-before-shipping"><img src="https://agentmods.dev/badge/skills/owl-listener/designpowers/verification-before-shipping.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00035 | $0.00963 |
| Opus 5.5 | $0.00014 | $0.00385 |
| Sonnet 5.5 | $0.00007 | $0.00193 |
| Haiku 4.5 | $0.00003 | $0.00096 |
Grade A, and why
verification-before-shipping scanned grade A with 0 findings 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Verification Before Shipping
Do not say it is done until you have proof. This skill prevents the most common failure mode in design work — declaring completion based on intent rather than evidence.
The Rule
NEVER claim work is complete, fixed, passing, or ready without running verification and confirming the output. "I believe this works" is not verification. "I ran these checks and here are the results" is.
When to Use
- Before declaring a design task complete
- Before moving from one phase to the next
- Before handoff to engineering
- Before creating a PR or committing design artefacts
- Any time you are about to say "done"
Process
Step 1: Check Against the Plan
If a design plan exists:
- Every task in the plan is marked complete
- Every verification criterion in the plan has been met
- No tasks were skipped or deferred without explicit user approval
Step 2: Check Against the Brief
Reference the design brief:
- The stated problem is addressed
- All identified personas are served
- Success criteria are met or measurable
- Nothing in "out of scope" crept into scope (and vice versa)
Step 3: Accessibility Verification
Run — do not guess:
If code exists:
- Automated accessibility scan (axe-core, Lighthouse, or equivalent) — report results
- Keyboard navigation test — report results
- Screen reader test (at minimum, check heading structure and form labels)
- Zoom to 200% — report results
- Check prefers-reduced-motion behaviour — report results
If design artefacts only:
- Contrast ratios verified with a tool (not by eye)
- Touch targets measured (not estimated)
- Heading hierarchy documented
- All states designed (not just the happy path)
Step 4: Content Verification
- All placeholder text has been replaced with real content
- Error messages are written (not "TODO")
- Alt text is present for all images
- Labels are specific and descriptive
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 · 126 lines · 35 tokens per session scan A 8c8df52cdf6c
verification-before-shipping is a skill published in the GitHub repository Owl-Listener/designpowers (255 stars, last pushed 4mo ago), licensed MIT. It adds 35 tokens to every session and 963 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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