Borrowing it
Nothing to install: this file belongs to saski/arnesto. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/saski/arnesto/main/.agents/skills/prd-writer/SKILL.mdgit clone --depth 1 https://github.com/saski/arnestoWrote 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/saski/arnesto/prd-writer)<a href="https://agentmods.dev/skills/saski/arnesto/prd-writer"><img src="https://agentmods.dev/badge/skills/saski/arnesto/prd-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 | $0.00024 | $0.00484 |
| Opus 5 | $0.00012 | $0.00242 |
| Sonnet 5 | $0.00005 | $0.00097 |
| Haiku 4.5 | $0.00002 | $0.00048 |
Grade A, and why
prd-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 3d 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.
This is a copy
100% identical to prd-writer — 0 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.
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.
Domain Context
This skill implements a proven product management framework. The approach combines best practices from industry leaders and is designed for practical application in day-to-day PM work.
Input Requirements
- Context about your product, feature, or problem
- Relevant data, research, or constraints (recommended but optional)
- Clear articulation of what you're trying to achieve
PRD Writer
When to Use
- Starting a new feature or product initiative
- Need to document requirements for the engineering team
- Stakeholders need a detailed project overview
- Before beginning design or development work
- To align cross-functional teams on scope and goals
What This Skill Does
Creates structured, comprehensive PRDs covering problem statement, proposed solution, requirements, success metrics, and implementation details.
Instructions
Help me write a comprehensive PRD for [feature name]. Include:
- Problem Statement
- Current situation
- User pain points
- Business impact
- Proposed Solution
- Overview of the approach
- User stories
- Success metrics
- Requirements
- Functional requirements
- Technical requirements
- Design requirements
- Implementation
- Dependencies
- Timeline estimate
- Resources needed
- Risks and Mitigations
Your context: [Add product context, feature details, and constraints here]
Best Practices
- Be specific about the problem and user pain points
- Include quantitative success metrics
- Define scope clearly (what's in scope and out of scope)
- Consider technical constraints upfront
- Add detailed user stories for key flows
- Include acceptance criteria
Example
Input: Building a notification center for SaaS app, target users are power users who miss important updates Output: Full PRD with problem statement, user stories, functional/technical requirements, success metrics (reduce missed notifications by 40%), timeline, and risk assessment
Further Reading
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.
- 3d ago First seen · 76 lines · 24 tokens per session scan A 2cf614bc5960
prd-writer is a skill published in the GitHub repository saski/arnesto (5 stars, last pushed today), licensed Unlicense. It adds 24 tokens to every session and 484 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to prd-writer, differing in 0 lines, and is treated as a copy.
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