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/howells/arc/auditnpx skills add howells/arc --skill auditgit clone --depth 1 https://github.com/howells/arcWhat 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 | $0.00069 | $0.06516 |
| Opus 5 | $0.00034 | $0.03258 |
| Sonnet 5 | $0.00014 | $0.01303 |
| Haiku 4.5 | $0.00007 | $0.00652 |
Grade A, and why
audit 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 2d 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 — 548 lines — stays where its author put it; the contents beside it link to each section on GitHub.
<tool_restrictions>
EnterPlanMode and ExitPlanMode are banned. This skill is Arc's own structured process.
</tool_restrictions>
<arc_runtime>
Requires the full Arc bundle. Arc-owned paths (agents/, references/, disciplines/, templates/, scripts/, rules/, skills/) resolve from the plugin root — the directory containing agents/ and skills/. Everything else is the user's repository.
</arc_runtime>
<platform_context>
Adapt to the current harness rather than assuming Claude tool names — task tracking, structured
questions, and subagent delegation each degrade gracefully when absent. Load
references/platform-tools.md when a mapping isn't obvious.
Where native task tracking exists, check for an existing task for this audit and mark it
in_progress before starting.
</platform_context>
<required_reading> Load each at the phase that needs it, not up front:
| Phase | Load |
|---|---|
| 1 — detect | references/audit-detection.md, references/audit-signals.md |
| 3 — dispatch | references/audit-reviewer-rules.md, references/audit-reviewer-prompts.md, disciplines/dispatching-parallel-agents.md, references/maintainability-review.md |
| 3 and 4 — score and calibrate | references/audit-scorecard.md, references/audit-stage-calibration.md |
| 4 — vet | references/finding-vetting.md |
| 5 — report | templates/audit-report.md |
Load when relevant:
references/react-audit-signals.md— React, Next.js, TanStack Query, or React Native projects. Pass the relevant sections into reviewer prompts as audit signals.references/index.md— the full reference catalogue, when a finding needs background you can't name a file for. </required_reading>
<rules_context>
Project coding rules come from .ruler/ when it exists, otherwise Arc's own rules/.
references/audit-reviewer-rules.md lists which rules each reviewer receives and the frontend
implementation checks for daniel-product-engineer and accessibility-engineer. Load it before
composing reviewer prompts.
These inform implementation and accessibility checks only. Do not score visual taste, invent a visual direction, or create redesign findings; defer visual direction to the project's design source of truth. </rules_context>
Parse arguments:
$ARGUMENTSmay contain:- A path (e.g.,
apps/web,packages/ui,src/) - A plain-language focus (e.g., "security", "performance", "architecture", "accessibility")
- A path (e.g.,
Do not advertise audit flags or variants. If the user provides a path or focus, treat it as scope guidance for the same default audit workflow.
Gardening modes (lightweight, run periodically):
The harness that earns trust decays: docs drift from code, rules go stale. When the focus is "doc gardening" or "rule gardening", skip reviewer dispatch and run the matching cheap pass instead. These are cheap enough to run on a cadence, not only when something is wrong.
- Doc gardening — walk the project's documentation (
README,docs/,AGENTS.md,CONTEXT.md, package docs) and, for each claim, check it against the code. Fix what is clearly stale (wrong paths, renamed commands, dead links); flag what needs a human decision. - Rule gardening — check that the project's written rules (
.ruler/orrules/) are still followed. For each violation, ask whether it is intentional before flagging. Flag dead rules for deletion: never triggered, no longer relevant, or already enforced mechanically elsewhere (linter, boundaries, CI).
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.
- 2d ago First seen · 548 lines · 69 tokens per session scan A 537626ebb6cb
audit is a skill published in the GitHub repository howells/arc (25 stars, last pushed 18d ago), licensed MIT. It adds 69 tokens to every session and 6,516 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 2026-08-30.
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