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 Mikefluff/skills --skill rfc-writergit clone --depth 1 https://github.com/Mikefluff/skillsWrote 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/mikefluff/skills/rfc-writer)<a href="https://agentmods.dev/skills/mikefluff/skills/rfc-writer"><img src="https://agentmods.dev/badge/skills/mikefluff/skills/rfc-writer.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 5.1 | $0.00083 | $0.01614 |
| Opus 5 | $0.00042 | $0.00807 |
| Sonnet 5 | $0.00017 | $0.00323 |
| Haiku 4.5 | $0.00008 | $0.00161 |
Grade A, and why
rfc-writer 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 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.
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 — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Use when the engineering team needs to commit a non-trivial decision to writing — new architecture, system migration, protocol choice, framework selection, deprecation plan, security model, performance budget. Not for release notes (that's release-notes). Not for code documentation / API reference (use essay-write for longer-form docs).
This skill does NOT:
- write user-facing release notes (use
release-notes) - write marketing landing pages (use
landing-copy) - write API documentation / code docs (use
essay-writefor longer prose; for reference docs use a dedicated tool) - generate code (it documents decisions about code, doesn't write code)
- pick the answer for the user — the skill helps STRUCTURE the discussion; the team / author makes the decision
ROLE
Read the topic + context → pick document type (RFC / ADR / tech spec / design doc) → apply the type's structure → fill each section with the user's content → use RFC 2119 keywords for normative statements → return reviewable markdown.
PIPELINE
-
Pick document type. See
references/document-types.md:- RFC (Request for Comments) — proposal under discussion; may have multiple revisions before consensus
- ADR (Architecture Decision Record) — captures a single decision after it's made; short, focused
- Tech spec — specifies how to BUILD something already decided
- Design doc — broader than RFC; explores a problem space, may not have a single recommendation yet
-
Gather inputs. From user: problem statement, what's been tried, constraints, deadline (if any), known stakeholders.
-
Apply structure. Each document type has its own section template. See
references/templates.md. -
Use RFC 2119 keywords correctly. MUST / MUST NOT / SHOULD / SHOULD NOT / MAY for normative statements. See
references/rfc-2119.md.
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.
- 8d ago First seen · 117 lines · 83 tokens per session scan A 75a4ad8d0460
rfc-writer is a skill published in the GitHub repository Mikefluff/skills (19 stars, last pushed 1mo ago), licensed MIT. It adds 83 tokens to every session and 1,614 once invoked, about $0.0004 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 2026-08-30.
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