Borrowing it
Nothing to install: this file belongs to vanillagreencom/kendex. 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/vanillagreencom/kendex/main/.agents/skills/docs-writing/SKILL.mdgit clone --depth 1 https://github.com/vanillagreencom/kendexWrote 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/vanillagreencom/kendex/docs-writing)<a href="https://agentmods.dev/skills/vanillagreencom/kendex/docs-writing"><img src="https://agentmods.dev/badge/skills/vanillagreencom/kendex/docs-writing/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/vanillagreencom/kendex/docs-writing"><img src="https://agentmods.dev/badge/skills/vanillagreencom/kendex/docs-writing.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 | $0.00035 | $0.05198 |
| Opus 5.5 | $0.00014 | $0.02079 |
| Sonnet 5.5 | $0.00007 | $0.01040 |
| Haiku 4.5 | $0.00003 | $0.00520 |
Grade C, and why
docs-writing scanned grade C with 1 finding 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 8d 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- kendex:project-instructions:start --> How it starts
The opening of the file, as written. The whole thing — 204 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Project Instructions
Problems with a kendex-owned skill go through kendex report; check ownership in the file first.
After an authorized documentation rewrite changes kendex-owned inputs, use the repository refresh and verification route. Respect a launched lane's refresh restriction. Keep refresh with the existing owner: kendex uses its lock-record Actions workflow and rolling kendex/lock pull request; consumers with automatic refresh use their kendex-refresh Actions workflow and rolling kendex/refresh pull request. When no refresh workflow exists and the fleet is local, the overseer owns refresh in the base checkout. Keep the local-fleet full post-merge route. This local owner is not a hosted control VM. Confirm any other execution owner before adoption. A hosted consumer without a refresh workflow must confirm an authorized owner outside the control VM. The hosted control checkout receives committed outputs through sync-base after they merge.
Migrate this repository hand-written harness instructions only through an authorized instruction migration. Put rules used by one installed skill in that skill's named [skill-instructions] key in kendex.toml, or kendex-local.toml only for a source catalog. Put agent-specific rules in the named [agent-additional-instructions] key and command-specific rules in the named [command-instructions] key. Keep only rules every agent needs in AGENTS.md. Keep operator instructions in consumer docs. Preserve every still-required rule. Remove an empty source instruction file only after its replacement is checked.
Docs Writing
A repository's internal design documentation holds what the code cannot show: the principle behind a design, the rule an agent could break without noticing, a decision with its reason, a convention that differs from a tool default, and a pointer to the canonical code. Everything else lives in the code, its comments, the tests and git history.
What ships with it
15 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.
- examples/architecture-design-system.md 4.0 KB
- examples/architecture-plugins.md 4.1 KB
- examples/behaviour-spec.md 3.4 KB
- examples/decision.md 1.4 KB
- examples/development.md 1.2 KB
- examples/human-page.md 2.1 KB
- examples/nested-agents-components.md 585 B
- examples/nested-agents-plugins.md 635 B
- examples/readme.md 2.6 KB
- examples/reference.md 2.8 KB
- examples/root-agents.md 1.5 KB
- examples/skill-entry.md 2.9 KB
- README.md 1.4 KB
- references/assistant-home.md 4.2 KB
- workflows/rewrite.md 9.5 KB
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.
- 8d ago Changed · -5 lines e6f86242f351
- 14d ago Changed 411a9130f92c
- 17d ago Changed · +10 lines 3702b80c0447
- 19d ago Changed · +4 lines be281f04d193
- 20d ago Changed · -1 lines 93e5c78d7ff5
- 21d ago Changed · +1 lines e977d83ebcc7
- 22d ago Changed · +21 lines e3c84582d8a7
- 23d ago Changed · +1 lines 65caeef4f96d
- 25d ago Changed 69d6e3962d3f
- 1mo ago First seen · 173 lines · 35 tokens per session scan C 54fcf77f3e90
docs-writing is a skill published in the GitHub repository vanillagreencom/kendex (87 stars, last pushed yesterday), licensed MIT. It adds 35 tokens to every session and 5,198 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-06.
Other skills, from other repositories
prose-review
Review prose written for others (e.g., user-facing documentation, prompts for other LLMs, reports, plans, inline comments, docstrings) for local jargon leakage, orphaned references, missing grounding, and audience or genre mismatch. Always run on prose you produce or materially edit, except for routine conversational…
text-search
Search indexed text corpora with qmd. For indexed content, prefer qmd over grep.
rp
Always read this skill when the user mentions "rp" or "repoprompt", or before accessing a repository outside the current RepoPrompt workspace. Covers workspace discovery, binding, root verification, and workspace hygiene.
claude-md-improver
Audit and improve existing CLAUDE.md files across a repository. Use for a deliberate, repo-wide quality review—not to record learnings from the current session.
claude-md-revision
Record durable, project-specific learnings from the current session in CLAUDE.md, .claude.local.md, or AGENTS.md—not general documentation, session summaries, or repo-wide audits.
gather-retrospectives
Gather retrospective feedback from past Pi sessions about a package, tool, or workflow. Use for historical retros and recurring friction, not assessment of only the current session.