Borrowing it
Nothing to install: this file belongs to dzhng/duet-agent. 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/dzhng/duet-agent/main/.agents/skills/write-docs/SKILL.mdgit clone --depth 1 https://github.com/dzhng/duet-agentWrote 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/dzhng/duet-agent/write-docs)<a href="https://agentmods.dev/skills/dzhng/duet-agent/write-docs"><img src="https://agentmods.dev/badge/skills/dzhng/duet-agent/write-docs/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/dzhng/duet-agent/write-docs"><img src="https://agentmods.dev/badge/skills/dzhng/duet-agent/write-docs.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 | $0.00093 | $0.00878 |
| Opus 5.5 | $0.00037 | $0.00351 |
| Sonnet 5.5 | $0.00019 | $0.00176 |
| Haiku 4.5 | $0.00009 | $0.00088 |
Grade A, and why
write-docs 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.
This is a copy
100% identical to write-docs — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Write Docs
A doc is a glossary: it names the moving parts, says why each exists, and carries the principles a reader can't derive by grepping. The code is the source of truth for what exists right now — the doc must never race it. Before writing any line, ask the one question that governs this skill: could the reader get this faster and more reliably by reading the code? If yes, point them at the code instead of copying it in.
Keep vs shed
Keep — a reader cannot grep their way to these:
- The WHY: why a thing exists, the principle behind a split, the taxonomy file names don't reveal.
- Non-obvious discoveries: platform quirks, "if you remove this, X breaks because Y", a contract two files silently share.
- Pointers to where things live, and what KIND of thing lives there plus the rule for what belongs.
Shed — the code or its git history already holds these, so a copy only rots:
- Exact rosters: scene names, scenario tables, helper lists, class ids, file lists, command/flag matrices.
- Narrative and changelog: "we renamed X", "the old Y was removed as a dup", what was tried and abandoned.
- Exact counts, tick values, current constants, line numbers — anything that just restates the code.
Point, don't transcribe
Where you're tempted to list specifics, name the folder or the single file that owns them and send the reader there — prefer a folder over a file, a source-of-truth registry over a transcribed copy. Describe a helper module by the kind of helper it holds and the rule for what belongs in it, not its current roster. One concrete touchstone is fine to ground a principle; a full inventory is the smell. "The matchups live in the table that defines them; the ids key off the class registry" stays true after the next edit — reproducing either does not.
One home per fact
Every fact has exactly one canonical home; every other doc links to it. Repetition across docs is a maintenance bug — copies drift and the reader can't tell which is current. A root/global doc gets a short section plus pointers to the sub-docs. When two docs explain the same thing, pick the hub and cut the other to a pointer.
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 · 73 lines · 93 tokens per session scan A 522d8171a706
write-docs is a skill published in the GitHub repository dzhng/duet-agent (52 stars, last pushed 7d ago), licensed Apache-2.0. It adds 93 tokens to every session and 878 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to write-docs, differing in 0 lines, and is treated as a copy.
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