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 itseffi/agentic-os --skill prd-writinggit clone --depth 1 https://github.com/itseffi/agentic-osWrote 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/itseffi/agentic-os/prd-writing)<a href="https://agentmods.dev/skills/itseffi/agentic-os/prd-writing"><img src="https://agentmods.dev/badge/skills/itseffi/agentic-os/prd-writing/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/itseffi/agentic-os/prd-writing"><img src="https://agentmods.dev/badge/skills/itseffi/agentic-os/prd-writing.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 | $0.00023 | $0.00658 |
| Opus 5.5 | $0.00009 | $0.00263 |
| Sonnet 5.5 | $0.00005 | $0.00132 |
| Haiku 4.5 | $0.00002 | $0.00066 |
Grade A, and why
prd-writing 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 1mo 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 — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.
PRD Writing
Create clear, implementation-ready product requirements documents for initiatives that need alignment before coding.
The Process
Step 1: Confirm PRD is needed
Use PRD only if at least one is true:
- cross-team dependency
- multi-sprint scope
- high-risk decision or expensive tradeoff
- stakeholder alignment needed before build
If none apply, recommend execution-first flow (writing-plans -> tdd -> verification) instead.
Step 2: Gather required inputs
Collect:
- product goal and target user
- business context and constraints
- known assumptions and risks
- success criteria and timeline
State explicit assumptions when inputs are missing.
Step 3: Produce PRD in required format
Use this exact structure:
# [Product Name]
## About
[High-level overview of the product and goal.]
## Market Insights
[Market context, competitors, trends, and target users.]
## Problem
[Core user problem, pain points, and why existing solutions are insufficient.]
## Solution
[Proposed AI product solution and how it addresses the problem.]
## Feature Prioritization
| Feature | Reach | Impact | Confidence | Effort | RICE Score | Priority |
|---------|-------|--------|------------|--------|------------|----------|
| | | | | | | |
| | | | | | | |
| | | | | | | |
## Requirements
**Functional Requirements:**
- FR1:
- FR2:
- FR3:
**AI/ML Model Requirements:**
- MR1:
- MR2:
- MR3:
**Non-Functional Requirements:**
- NFR1:
- NFR2:
- NFR3:
## Challenges
[Key product, technical, data, and go-to-market challenges.]
## Positioning
| Use Case | Target User | Key Benefit | Differentiator |
|----------|-------------|-------------|----------------|
| | | | |
| | | | |
| | | | |
## Metrics
[Success metrics and north star metric.]
## Rollout Plan
- **Stakeholders & Communication**
- [Stakeholder groups and communication plan]
- **Roll-out Strategy**
- [Launch phases, gating criteria, and post-GA plan]
What ships with it
1 file 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.
- 1mo ago First seen · 121 lines · 23 tokens per session scan A e42cd07a265f
prd-writing is a skill published in the GitHub repository itseffi/agentic-os (117 stars, last pushed 14d ago), licensed MIT. It adds 23 tokens to every session and 658 once invoked, about $0.0001 per session on Opus 5.5. 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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