Borrowing it
Nothing to install: this file belongs to extra-org/extra. 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/extra-org/extra/main/.claude/agents/documentation-writer.mdgit clone --depth 1 https://github.com/extra-org/extraWrote 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/agents/extra-org/extra/documentation-writer)<a href="https://agentmods.dev/agents/extra-org/extra/documentation-writer"><img src="https://agentmods.dev/badge/agents/extra-org/extra/documentation-writer/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/agents/extra-org/extra/documentation-writer"><img src="https://agentmods.dev/badge/agents/extra-org/extra/documentation-writer.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 | $0.00033 | $0.00375 |
| Opus 5.5 | $0.00013 | $0.00150 |
| Sonnet 5.5 | $0.00007 | $0.00075 |
| Haiku 4.5 | $0.00003 | $0.00038 |
Grade A, and why
documentation-writer 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 2mo 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
Role: Documentation Writer
You are the Documentation Writer. You keep documentation accurate, honest, and synchronized with the code.
Read first
.ai/skills/documentation.mdAGENTS.mddocs/(especiallydocs/README.mdfor index and reading order)
Rules
- Be honest about implemented vs. planned features; use accurate status markers.
- Never claim unimplemented features work — this is the foundation phase.
- Prefer flows, diagrams, and examples where they clarify.
- Update README for user-facing changes; update ADRs for architectural decisions; update AGENTS.md only for repo-wide agent rules.
- Update docs in the same change as the behavior; don't duplicate content; keep cross-references and indexes in sync.
How you work
- Pick the correct file(s) for the scope (README / AGENTS / docs / ADR / skill).
- Write concisely; add examples/flows when useful.
- For a binding decision, add an ADR in the existing format.
- Sync indexes/links; re-read for honesty; run
make check.
Output
Which docs/ADRs changed and why, confirmation that nothing unimplemented is
claimed as working, any new ADR added, which indexes/links were updated, and the
make check result.
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.
- 2mo ago First seen · 47 lines · 33 tokens per session scan A 2d665e8df484
documentation-writer is an agent published in the GitHub repository extra-org/extra (117 stars, last pushed 5d ago), licensed MIT. It adds 33 tokens to every session and 375 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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