Borrowing it
Nothing to install: this file belongs to r3bl-org/r3bl-open-core. 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/r3bl-org/r3bl-open-core/main/.agents/skills/write-documentation/SKILL.mdgit clone --depth 1 https://github.com/r3bl-org/r3bl-open-coreWrote 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/r3bl-org/r3bl-open-core/write-documentation)<a href="https://agentmods.dev/skills/r3bl-org/r3bl-open-core/write-documentation"><img src="https://agentmods.dev/badge/skills/r3bl-org/r3bl-open-core/write-documentation/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/r3bl-org/r3bl-open-core/write-documentation"><img src="https://agentmods.dev/badge/skills/r3bl-org/r3bl-open-core/write-documentation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00000 | $0.12370 |
| Opus 5.5 | $0.00000 | $0.04948 |
| Sonnet 5.5 | $0.00000 | $0.02474 |
| Haiku 4.5 | $0.00000 | $0.01237 |
Grade A, and why
write-documentation 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 11d 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 — 1,356 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Writing Good Rust Documentation
This consolidated skill covers all aspects of writing high-quality rustdoc:
- Voice & Tone - Serious, meaningful, precise, and fun
- Prose Style - Opening lines, explicit subjects, verb tense
- Structure - Inverted pyramid principle
- Links - Intra-doc link patterns
- Constants - Human-readable numeric literals
- Formatting - Markdown tables and cargo rustdoc-fmt
- ANSI Escape Codes - Spaced
ESC [notation (seeansi-escape-codes.md)
When to Use
Proactively (While Writing Code)
- Writing new code that includes
///or//!doc comments - Creating new modules, traits, structs, or functions
- Adding links to other types or modules in documentation
- Defining byte/u8 constants
Retroactively (Fixing Issues)
/fix-intradoc-links- Fix broken links, convert inline to reference-style/fix-comments- Fix constant conventions in doc comments/fix-md-tables- Fix markdown table formatting/docs- Full documentation check and fix
Voice & Tone
r3bl is serious & meaningful & precise. r3bl is also fun.
Documentation should be rigorous about content, playful about presentation:
| Aspect | Serious & Precise | Fun |
|---|---|---|
| Technical accuracy | Correct terminology, proper distinctions | - |
| Links | Intra-doc links, authoritative sources | - |
| Visual aids | ASCII diagrams, tables | Emoji for scannability |
| Language | Clear, unambiguous | Literary references, personality |
Examples
Emoji for visual scanning (semantic, not decorative):
//! 🐧 **Linux**: Uses `epoll` for I/O multiplexing
//! 🍎 **macOS**: Uses `kqueue` (with PTY limitations)
//! 🪟 **Windows**: Uses IOCP for async I/O
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.
- 11d ago Changed 2efded012127
- 15d ago Changed · +92 lines 88042cf8d930
- 1mo ago Changed · +78 lines 68e441c86eaf
- 2mo ago First seen · 1,186 lines · 0 tokens per session scan A d88274798698
write-documentation is a skill published in the GitHub repository r3bl-org/r3bl-open-core (486 stars, last pushed yesterday), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 12,370 tokens. 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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