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 cnfeat/top-pm-skills --skill rfc-writergit clone --depth 1 https://github.com/cnfeat/top-pm-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/cnfeat/top-pm-skills/rfc-writer)<a href="https://agentmods.dev/skills/cnfeat/top-pm-skills/rfc-writer"><img src="https://agentmods.dev/badge/skills/cnfeat/top-pm-skills/rfc-writer/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/cnfeat/top-pm-skills/rfc-writer"><img src="https://agentmods.dev/badge/skills/cnfeat/top-pm-skills/rfc-writer.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 | $0.00101 | $0.03984 |
| Opus 5 | $0.00051 | $0.01992 |
| Sonnet 5 | $0.00020 | $0.00797 |
| Haiku 4.5 | $0.00010 | $0.00398 |
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 7d 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 — 408 lines — stays where its author put it; the contents beside it link to each section on GitHub.
RFC Writer Skill
Produce a complete engineering RFC (Request for Comments) for a technical decision or architectural change. An RFC is a structured proposal document — not a persuasion document. Its purpose is to expose a decision to scrutiny, surface trade-offs, document alternatives considered, and create a permanent record of why a choice was made.
A good RFC makes it possible for someone who wasn't in the room to understand years later why the team built something the way they did.
Required Inputs
Ask for these if not already provided:
- RFC title and author — what this RFC is about and who is proposing it
- Problem being solved — what is broken, missing, or inadequate today; why action is needed now
- Proposed solution — the approach the author is recommending, at least at a high level
- Context and constraints — team size, existing architecture, timeline pressures, budget limits, compliance requirements
- Alternatives considered — at least 2 alternative approaches the author has thought about
- Current status — is this pre-decision (seeking feedback) or post-decision (documenting a made decision)?
Output Format
RFC [Number]: [Title]
Author: [Name] | Team: [Team name] Created: [Date] | Last updated: [Date] Status: Draft | In Review | Approved | Rejected | Superseded by RFC-[X] Ticket: [JIRA-XXX] | Slack thread: [#channel link] Review deadline: [Date — when comments should be submitted by]
Abstract
[2–4 sentences summarising the entire RFC. Should stand alone — someone reading only this should understand what is being proposed, why, and what the main trade-off is. Write this last.]
1. Problem Statement
[Describe the problem being solved. Focus on the problem, not the solution. Be specific and quantified where possible.]
Current state: [Describe how things work today — the existing system, process, or architecture. Include any relevant constraints or limitations.]
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.
- 7d ago First seen · 408 lines · 101 tokens per session scan A c7e91ec8ed35
rfc-writer is a skill published in the GitHub repository cnfeat/top-pm-skills (48 stars, last pushed 3mo ago), licensed MIT. It adds 101 tokens to every session and 3,984 once invoked, about $0.0005 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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