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project.write_prd

project.write_prd is a skill for Claude Code from causify-ai/helpers. It costs 15 tokens per session (561 once invoked), scanned A, a copy of project.write_prd, Apache-2.0.

A product-requirements writing skill that turns an idea into `docs/prd.md`. A product requirements document, or PRD, describes what a product must and must not do without deciding how to build it.

In plain words
What is it for?
Use it to document the product goal, users, requirements, limits, and open questions from an idea file or description.
Why use it?
It gives the project a clear scope before technical design or coding begins and records unresolved questions instead of filling gaps with guesses.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter; reads .claude/ paths.

not rated 0repo +157 changed 4d ago A scan 15 tokens copy · 91% Apache-2.0 archived

Good fit Use it to document the product goal, users, requirements, limits, and open questions from an idea file or description.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/causify-ai/helpers/project.write_prd
View source ↗ causify-ai/helpers causify-ai.github.io
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.

Any agent
npx skills add causify-ai/helpers --skill project.write_prd
Clone the repo
git clone --depth 1 https://github.com/causify-ai/helpers

Made for: Claude Code.

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 project.write_prd

README.md
[![agentmods](https://agentmods.dev/badge/skills/causify-ai/helpers/project.write_prd/github.svg)](https://agentmods.dev/skills/causify-ai/helpers/project.write_prd)
Your own site
<a href="https://agentmods.dev/skills/causify-ai/helpers/project.write_prd"><img src="https://agentmods.dev/badge/skills/causify-ai/helpers/project.write_prd/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.

agentmods 80×15 button for project.write_prd

Your own site · 80×15
<a href="https://agentmods.dev/skills/causify-ai/helpers/project.write_prd"><img src="https://agentmods.dev/badge/skills/causify-ai/helpers/project.write_prd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 15 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 561 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 91% copy Near-identical to another mod 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 5.1 $0.00015 $0.00561
Opus 5.5 $0.00006 $0.00224
Sonnet 5.5 $0.00003 $0.00112
Haiku 4.5 $0.00002 $0.00056

Measured 4d ago against content hash 31ceb615c709, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

project.write_prd 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.

Origin

This is a copy

91% identical to project.write_prd — 34 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/skills/project.write_prd/SKILL.md · 66 lines

What it actually says

Goal

  • Given an idea, write docs/01-prd.md: what the product must do and must not do
  • Do not design the solution and do not write code

Input

  • <IDEA>: an idea file (e.g., research/ideas/<name>.md) or a free-text description
  • <DOCS_DIR>: the docs/ dir of the project, optional
    • If missing, use docs/ in the current dir

Workflow

Read the Idea

  • Read <IDEA> and the files it links to (papers, related ideas, existing code)
  • Read the existing docs in <DOCS_DIR>, if any, to avoid repeating them

Ask If the Idea Is Unclear

  • If the goal, the users, or the scope is not perfectly clear:
    • Do not write the PRD
    • Ask the user for clarification
    • Wait for the answers
  • Do not guess a requirement to fill a section
    • Put each unresolved item in "Open Questions"

Write the PRD

  • Create <DOCS_DIR>/01-prd.md
  • Follow the rules in .claude/skills/project.rules.md section "Write a PRD"
  • Follow the template .claude/templates/project_prd.template.md
  • Follow .claude/skills/markdown.rules.md and .claude/skills/text.rules.md
  • Point to the idea file and to the background instead of copying them

Update the Index

  • If <DOCS_DIR>/README.md exists, add a row for 01-prd.md, per .claude/skills/project.rules.md section "Write an Index in docs/README.md"

Conventions

  • Follow .claude/skills/project.rules.md for the docs of a project
  • Follow .claude/skills/markdown.rules.md and .claude/skills/text.rules.md

Constraints

  • Do not describe the solution: that is the job of architecture.write_design
  • Do not commit any change
  • Do not create a GitHub issue

Verification

  • Every requirement is an H3 ### `R<N>` (<short description>) and a test can check it
  • The non-goals are listed
  • Every open question is numbered
  • The PRD does not contain design or code
  • The row for 01-prd.md is in <DOCS_DIR>/README.md, if the file exists
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 Changed 31ceb615c709
  2. 6d ago Changed · +1 lines daee6c621109
  3. 9d ago First seen · 65 lines · 15 tokens per session scan A 4a3096ff6a99

Subscribe to this mod's changes

project.write_prd is a skill published in the GitHub repository causify-ai/helpers (0 stars, last pushed 5d ago), licensed Apache-2.0. It adds 15 tokens to every session and 561 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 91% identical to project.write_prd, differing in 34 lines, and is treated as a copy.

PlanningWriting and docs
Related

project.write_prd compared with skills from other repositories

project.write_prd next to 6 skills from other repositories
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project.write_prdcausify-ai/helpersSkill05d agoApache-2.0A15Claude Code
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local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79ktodayMITA200Claude Code, Codex
playwright-climicrosoft/playwrightSkill99ktodayApache-2.0A19Claude Code
systematic-debuggingobra/superpowersSkill314k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code
chat-pet-sprite-creationmicrosoft/vscodeSkill195ktodayMITA53Claude Code, Codex