Borrowing it
Nothing to install: this file belongs to KbWen/agentic-os. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/KbWen/agentic-os/main/.agents/skills/verification-before-completion/SKILL.mdgit clone --depth 1 https://github.com/KbWen/agentic-osWrote 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/kbwen/agentic-os/verification-before-completion)<a href="https://agentmods.dev/skills/kbwen/agentic-os/verification-before-completion"><img src="https://agentmods.dev/badge/skills/kbwen/agentic-os/verification-before-completion/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/kbwen/agentic-os/verification-before-completion"><img src="https://agentmods.dev/badge/skills/kbwen/agentic-os/verification-before-completion.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 | $0.00022 | $0.00329 |
| Opus 5.5 | $0.00009 | $0.00132 |
| Sonnet 5.5 | $0.00004 | $0.00066 |
| Haiku 4.5 | $0.00002 | $0.00033 |
Grade A, and why
verification-before-completion 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 1mo 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- verification-before-completion — 100% identical, 0 lines differ
What it actually says
Verification Before Completion
Overview
Any "completed" statement MUST be supported by evidence. This skill provides a pre-completion Gate Function, ensuring results are reproducible, traceable, and deliverable.
Ironclad Rules
- No evidence = no completion claim.
- Evidence MUST be reproducible by others; verbal descriptions are NOT accepted.
- If tests/checks fail, the status MUST revert to in-progress.
When to Use
- Tasks are preparing to enter
/ship. - Before submitting PRs or handing off work.
- After completing high-risk changes (data, permissions, core flows).
Gate Function
- Scope Gate: Confirm changes only cover the agreed scope.
- Quality Gate: Execute required tests and static checks.
- Evidence Gate: Compile reproducible evidence (commands, outputs, versions).
- Risk Gate: Confirm rollback strategies and known risks.
- Communication Gate: Output a completion summary (changes, validation, constraints).
Minimum Evidence Checklist
- At least one set of tests/checks directly related to this change.
- Specific execution commands and results (Success/Failure/Warning).
- If there are unfinished items, explicitly mark them with follow-up suggestions.
Common Mistakes
- Claiming "it should work" without any output evidence.
- Testing only the happy path, missing regressions or edge cases.
- Treating old test results as evidence for new changes.
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.
- 1mo ago First seen · 43 lines · 22 tokens per session scan A de3689a78eda
verification-before-completion is a skill published in the GitHub repository KbWen/agentic-os (220 stars, last pushed yesterday), licensed MIT. It adds 22 tokens to every session and 329 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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