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 agentmods add skills/buildmoonshot/skillpacks/verify-before-donenpx skills add buildmoonshot/skillpacks --skill verify-before-donegit clone --depth 1 https://github.com/buildmoonshot/skillpacksWrote 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/buildmoonshot/skillpacks/verify-before-done)<a href="https://agentmods.dev/skills/buildmoonshot/skillpacks/verify-before-done"><img src="https://agentmods.dev/badge/skills/buildmoonshot/skillpacks/verify-before-done.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00060 | $0.00384 |
| Opus 5 | $0.00030 | $0.00192 |
| Sonnet 5 | $0.00012 | $0.00077 |
| Haiku 4.5 | $0.00006 | $0.00038 |
Grade A, and why
verify-before-done 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 4d 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.
What it actually says
Verify Before Done
Do not say a change is "done," "fixed," or "working" until you have evidence that it is.
What counts as evidence
In rough order of strength:
- Run it. Execute the test, build, script, or command that exercises the change and read the actual output.
- Add a check. If nothing tests this path, write a small test or assertion that would fail before your fix and pass after — then run it.
- Trace it. If you genuinely can't run anything, walk the changed logic step by step with a concrete example input and show the result. Say explicitly that this is a trace, not an execution.
How to report
- If it passed: say so, and briefly say what you ran ("ran
npm test— 14 passing"). - If it failed: say that plainly and show the output. A failure you report is a problem solved; a failure you hide is a problem shipped.
- If you couldn't verify: say "I couldn't verify this because ___" instead of implying it works. Never let an unverified change wear the word "done."
The rule
"Should work" is not "works." If you didn't check, don't claim it.
Why this matters
The most expensive bug is the one the agent confidently called "fixed." Verification converts confident guesses into either a real result or an honest "not yet" — both of which save the user from discovering the failure in production.
What ships with it
1 file 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.
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.
- 4d ago First seen · 31 lines · 60 tokens per session scan A a95d521bee3e
verify-before-done is a skill published in the GitHub repository buildmoonshot/skillpacks (2 stars, last pushed 2mo ago), licensed MIT. It adds 60 tokens to every session and 384 once invoked, about $0.0003 per session on Opus 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 2026-08-31.
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