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 skills add Kevin-Liu-01/Agent-Machines --skill rtfmgit clone --depth 1 https://github.com/Kevin-Liu-01/Agent-MachinesWrote 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/kevin-liu-01/agent-machines/rtfm)<a href="https://agentmods.dev/skills/kevin-liu-01/agent-machines/rtfm"><img src="https://agentmods.dev/badge/skills/kevin-liu-01/agent-machines/rtfm/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/kevin-liu-01/agent-machines/rtfm"><img src="https://agentmods.dev/badge/skills/kevin-liu-01/agent-machines/rtfm.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 | $0.00043 | $0.00602 |
| Opus 5 | $0.00022 | $0.00301 |
| Sonnet 5 | $0.00009 | $0.00120 |
| Haiku 4.5 | $0.00004 | $0.00060 |
Grade A, and why
rtfm 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 9d 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 — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.
RTFM
When you think you know how an API, tool, or system works, you are wrong until you have verified it against the source. This skill exists because workarounds for nonexistent limitations are worse than the problems they claim to solve.
When to use
Every time you:
- claim a library, API, or tool lacks a feature
- claim something "can't be done" or "isn't supported"
- write a workaround, shim, or fallback
- choose one approach over another based on a tool's capabilities
- dismiss an option without trying it
Procedure
1. Read the primary source
The actual code, API docs, or type signature. Not a summary. Not a blog post. Not your memory.
| Claim type | Where to look |
|---|---|
| "crate X doesn't support Y" | docs.rs/X, GitHub source, Cargo.toml features |
| "API doesn't accept parameter Z" | OpenAPI spec, SDK type definition, --help |
| "kernel doesn't support mode M" | kernel.org/doc/html/, Documentation/ tree |
| "service doesn't offer feature F" | official product docs, changelog, pricing page |
| "protocol doesn't allow operation O" | RFC, spec PDF, reference implementation |
2. Read the secondary source
Official examples, changelogs, migration guides.
- README examples in the upstream repo
- CHANGELOG entries for the version you are using
- Official SDK example repos
- Release notes and migration guides
3. Read the tertiary source
Community evidence that people are doing the thing you think is impossible.
- GitHub issues and PRs mentioning the feature
- Stack Overflow answers with working code
- Reddit or HN threads with first-hand experience
- Conference talks or blog posts from maintainers
4. Run it
If the claim is about runtime behavior, write a minimal test. Five lines. Compile it. Run it. See what happens. Do not theorize about what the compiler, runtime, or service will do. Ask it.
5. Only then decide
After steps 1-4, you may say "X doesn't support Y." Not before.
If you skipped any step, go back. The five minutes you spend reading docs saves the five hours you spend building and debugging a workaround for a limitation that does not exist.
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.
- 9d ago First seen · 78 lines · 43 tokens per session scan A 3c0e3937cf9b
rtfm is a skill published in the GitHub repository Kevin-Liu-01/Agent-Machines (29 stars, last pushed today), licensed MIT. It adds 43 tokens to every session and 602 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 2026-09-03.
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