prfaq

prfaq is a skill for Claude Code, Codex from sananthanarayan/skilldrop. It costs 83 tokens per session (1,793 once invoked), scanned A, original, MIT.

A working-backwards document format for testing a product idea before engineering begins. It combines a launch announcement with customer and internal FAQs to clarify who the product serves, what problem it solves, and why it is different.

In plain words
What is it for?
Use it to assess a proposed product, align stakeholders, decide whether an idea deserves a requirements document, and identify missing assumptions or reasons to stop.
Why use it?
It exposes vague customers, problems, or benefits before time is spent writing detailed requirements. Difficult questions from customers and insiders are answered while the idea is still being evaluated.

Skill for Claude CodeCodex

Part of the skilldrop plugin — 51 skills, 4 agents shipped together

Install

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.

agentmods
npx agentmods add skills/sananthanarayan/skilldrop/prfaq
Any agent
npx skills add sananthanarayan/skilldrop --skill prfaq
Clone the repo
git clone --depth 1 https://github.com/sananthanarayan/skilldrop

Made for: Claude Code, Codex.

Or install skilldrop, the plugin that ships this one along with the rest of its 51 skills, 4 agents.

Wrote 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.

agentmods badge for prfaq

README.md
[![agentmods](https://agentmods.dev/badge/skills/sananthanarayan/skilldrop/prfaq.svg)](https://agentmods.dev/skills/sananthanarayan/skilldrop/prfaq)
Your own site
<a href="https://agentmods.dev/skills/sananthanarayan/skilldrop/prfaq"><img src="https://agentmods.dev/badge/skills/sananthanarayan/skilldrop/prfaq.svg" alt="Measured on agentmods" height="20"></a>
Per session 83 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,793 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00083 $0.01793
Opus 5 $0.00042 $0.00897
Sonnet 5 $0.00017 $0.00359
Haiku 4.5 $0.00008 $0.00179

Measured 4d ago against content hash ef05e166a6fd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

prfaq 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.

skills/prfaq/SKILL.md · 76 lines

How it starts

The opening of the file, as written. The whole thing — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.

prfaq

The working-backwards forcing function: write the launch press release before the product exists, then answer the questions a real customer and a skeptical insider would ask. If the press release can't be written specifically — a nameable customer, a problem in their words, a benefit you could measure — the product isn't ready to spec, and surfacing that is the deliverable. Sits upstream of prd-draft (requirements for a committed product) and business-case (invest/defer decision): the PRFAQ decides whether the idea deserves either.

How to respond

  1. Pin the three anchors — customer, problem, differentiator. Ask at most 2 questions, spent on the weakest anchors: "Who exactly is the customer, and what do they do today instead?" and "What does this do that the thing they use today doesn't?" A PRFAQ for "everyone" with a problem stated in industry jargon produces a marketing document, not a forcing function — don't start drafting until all three anchors are concrete. Non-interactive run (no user to ask): derive missing anchors from the input where defensible and tag them [assumption] at the top; an anchor with no defensible derivation → emit BLOCKED: need <anchor> naming what to rerun with, instead of fabricating a customer.

  2. Write the press release — one page, datelined with a city and a realistic launch date; no product name exists yet → invent a plausible working name and mark it as a placeholder. The blocks:

    • Headline: product name + the customer benefit in one sentence. ✅ "Acme Contracts cuts routine contract review from three days to twenty minutes for in-house legal teams" — ❌ "Acme launches AI-powered legal platform".
    • Sub-headline: the one key detail the headline compressed (who it's for, what it replaces, or the mechanism).
    • Problem paragraph: the customer's current pain in their words. ✅ "I can't close a deal until legal clears the paperwork, and legal is three days behind" — ❌ "lack of operational visibility into contract workflows".
    • Solution paragraph: what the product does and what it does differently from the alternative the customer already uses. "AI-powered" is not a differentiator; the mechanism is.
    • Leadership quote: one sentence naming the strategic rationale, attributed to a role ("our VP of Product"), never a placeholder name. If the rationale can't be articulated, that's a finding — report it.
    • Customer quote: a named-persona customer describing the before/after in concrete terms — a specific moment, not adjectives.
    • Call to action: what the customer does next to get started.

Read the full file on GitHub · 76 lines

Files

What ships with it

4 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.

Changes

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.

  1. 4d ago First seen · 76 lines · 83 tokens per session scan A ef05e166a6fd

Subscribe to this mod's changes

prfaq is a skill published in the GitHub repository sananthanarayan/skilldrop (2 stars, last pushed 21d ago), licensed MIT. It adds 83 tokens to every session and 1,793 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 2026-08-31.

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