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/shenli/devtool-ax-kit/ax-verificationnpx skills add shenli/devtool-ax-kit --skill ax-verificationgit clone --depth 1 https://github.com/shenli/devtool-ax-kitWrote 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/shenli/devtool-ax-kit/ax-verification)<a href="https://agentmods.dev/skills/shenli/devtool-ax-kit/ax-verification"><img src="https://agentmods.dev/badge/skills/shenli/devtool-ax-kit/ax-verification.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 | $0.00015 | $0.00191 |
| Opus 5 | $0.00008 | $0.00096 |
| Sonnet 5 | $0.00003 | $0.00038 |
| Haiku 4.5 | $0.00002 | $0.00019 |
Grade A, and why
ax-verification 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 3d 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
Define assertions outside the agent's editable workspace. Verify observable behavior, not implementation shape: functional outputs, persistence across a restart, independent identities, effect counts, and credential absence where relevant. Return structured pass/fail results with details and a nonzero exit status on failure.
Run the verifier separately after the agent finishes. Do not let the agent edit the verifier or turn a missing assertion into a pass. Keep checks local or explicitly scoped to disposable test resources.
For timing-sensitive behavior, deliberately exercise the boundary and use a fresh identity per trial. Report valid-trial denominators separately from infrastructure availability.
Record disagreement between the agent's reported result and the independent result as a first-class outcome. Exercise timing, restart, duplicate-effect, and malformed-response boundaries when those are part of the task contract.
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.
- 3d ago First seen · 23 lines · 15 tokens per session scan A ce0c783ff33b
ax-verification is a skill published in the GitHub repository shenli/devtool-ax-kit (2 stars, last pushed 4d ago), licensed Apache-2.0. It adds 15 tokens to every session and 191 once invoked, about $0.0001 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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