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 agentmods add skills/rileyhilliard/agentrc/documenting-systemsnpx skills add rileyhilliard/agentrc --skill documenting-systemsgit clone --depth 1 https://github.com/rileyhilliard/agentrcWrote 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/rileyhilliard/agentrc/documenting-systems)<a href="https://agentmods.dev/skills/rileyhilliard/agentrc/documenting-systems"><img src="https://agentmods.dev/badge/skills/rileyhilliard/agentrc/documenting-systems.svg" alt="Measured on agentmods" 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 | $0.00031 | $0.00484 |
| Opus 5 | $0.00015 | $0.00242 |
| Sonnet 5 | $0.00006 | $0.00097 |
| Haiku 4.5 | $0.00003 | $0.00048 |
Grade A, and why
documenting-systems 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 4d 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
Technical Documentation
For writing style, tone, and voice guidance, use Skill(ce:writer) with The Engineer persona.
Core Principles
1. Progressive Disclosure
Reveal information in layers:
| Layer | Content | User Question |
|---|---|---|
| 1 | One-sentence description | What is it? |
| 2 | Quick start code block | How do I use it? |
| 3 | Full API reference | What are my options? |
| 4 | Architecture deep dive | How does it work? |
Warnings, breaking changes, and prerequisites go at the TOP.
2. Task-Oriented Writing
<!-- Bad: Feature-oriented -->
## AuthService Class
The AuthService class provides authentication methods...
<!-- Good: Task-oriented -->
## Authenticating Users
To authenticate a user, call login() with credentials:
3. Show, Don't Tell
Every concept needs a concrete example.
Formatting Standards
- Sentence case headings: "Getting started" not "Getting Started"
- Max 3 heading levels: Deeper means split the doc
- Always specify language in code blocks
- Relative paths for internal links
- Tables for structured data with 3+ attributes
Quality Checklist
- Code examples tested and runnable
- No placeholder text or TODOs
- Matches actual code behavior
- Scannable without reading everything
- Reader knows what to do next
Anti-Patterns
| Problem | Fix |
|---|---|
| Wall of text | Break up with headings, bullets, code, tables |
| Buried critical info | Warnings/breaking changes at TOP |
| Missing error docs | Always document what can go wrong |
Templates
For README, API endpoint, and file organization templates, see references/templates.md.
Related Skills
Skill(ce:writer)- Writing style, tone, and voice (load The Engineer persona)Skill(ce:visualizing-with-mermaid)- Architecture and flow diagrams
What ships with it
1 file 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.
- 4d ago First seen · 73 lines · 31 tokens per session scan A 6de70f4c48c4
documenting-systems is a skill published in the GitHub repository rileyhilliard/agentrc (3 stars, last pushed 6mo ago), licensed MIT. It adds 31 tokens to every session and 484 once invoked, about $0.0002 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 2026-08-31.
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