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 mirkobozzetto/arsenal --skill briefgit clone --depth 1 https://github.com/mirkobozzetto/arsenalWrote 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/mirkobozzetto/arsenal/brief)<a href="https://agentmods.dev/skills/mirkobozzetto/arsenal/brief"><img src="https://agentmods.dev/badge/skills/mirkobozzetto/arsenal/brief/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/mirkobozzetto/arsenal/brief"><img src="https://agentmods.dev/badge/skills/mirkobozzetto/arsenal/brief.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00022 | $0.00376 |
| Opus 5 | $0.00011 | $0.00188 |
| Sonnet 5 | $0.00004 | $0.00075 |
| Haiku 4.5 | $0.00002 | $0.00038 |
Grade A, and why
brief 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
Brief
Clarify only missing product decisions: user, problem, scope, constraints and observable success. Do not repeat information already supplied or require a numeric business metric for a small usability change. Group related questions in plain prose; no start/proceed confirmations. -a/-s allow explicit assumptions, not invented certainty or external permissions.
Write docs/brief//brief.md and tasks.md. Keep the existing frontmatter and structural headings Acceptance criteria, Success metrics, Out-of-scope, Relevant Files and Tasks. Derive outcome tasks from acceptance criteria; do not inflate them into a fixed number of phases. One feature, one folder.
Mark ready only when the brief is complete; never implement automatically. Render with scripts/render.py only for --html or an explicit request. No mandatory browser, commit, test run, or handoff menu. Report paths and the next action if requested. Existing files are updated, not duplicated.
Arsenal handoff
When called by Arsenal for an explicitly requested broader task, return the brief, its readiness and unresolved decisions to Arsenal. Do not launch ship yourself. Arsenal may continue an authorized implementation once the brief is ready; a request for a brief alone never authorizes implementation.
Execution policy
Work solo. Ask before any subagent or reviewer, even in auto mode. Explain the independent scope and expected benefit first. No hidden advisor, nested delegation, model retuning, repeated successful checks, or progress spam. Use existing context before asking questions. Stop when the requested result is delivered. User stops and scope changes override pending steps.
What ships with it
6 files 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.
- 3d ago Changed · +7 lines f47df1bbd51e
- 5d ago Changed · -53 lines · -66 tokens per session 4c86c9d3a22e
- 11d ago First seen · 85 lines · 88 tokens per session scan A 00497e0fad07
brief is a skill published in the GitHub repository mirkobozzetto/arsenal (15 stars, last pushed 4d ago), licensed MIT. It adds 22 tokens to every session and 376 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 2026-08-30.
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