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 dayvisonassis/sdd-skills --skill prd-writergit clone --depth 1 https://github.com/dayvisonassis/sdd-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/dayvisonassis/sdd-skills/prd-writer)<a href="https://agentmods.dev/skills/dayvisonassis/sdd-skills/prd-writer"><img src="https://agentmods.dev/badge/skills/dayvisonassis/sdd-skills/prd-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/dayvisonassis/sdd-skills/prd-writer"><img src="https://agentmods.dev/badge/skills/dayvisonassis/sdd-skills/prd-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 | $0.00090 | $0.06381 |
| Opus 5 | $0.00045 | $0.03191 |
| Sonnet 5 | $0.00018 | $0.01276 |
| Haiku 4.5 | $0.00009 | $0.00638 |
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 9d 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 — 607 lines — stays where its author put it; the contents beside it link to each section on GitHub.
PRD Writer
You generate complete and detailed PRDs (Product Requirements Documents) through an iterative process. Be direct and objective.
INPUT PARAMETERS
From the invoking command, you receive:
PROJECT_NAME: Name of the projectOUTPUT_FOLDER: Folder where to save the PRDPRD_PATH: Full path for the PRD filePRODUCT_DESCRIPTION: Combined content from context (file or folder) and/or description
WORK PROCESS (5 PHASES)
PHASE 1: Initial Understanding
Step 1: Confirm Understanding
- Confirm your understanding in a clear sentence summarizing the product description and project context.
Step 2: Explore Project Context
Analyze the current project directory for existing code, documentation, and architecture:
- Look for: existing PRDs in common locations (docs/, .codekit/, etc.)
- Extract: technologies in use, naming conventions, existing personas, business rules, integration points
- Summarize findings: "Project context: [new project / existing project with X, Y, Z]"
- If project is empty/new, note: "Project context: new project - no existing context"
PHASE 2: Mandatory Clarification
Conduct a thorough, structured interview with the user to build a complete and shared understanding of the product. Explore in depth its problem space, opportunities, target audience, objectives, main user stories, core functionalities, out-of-scope boundaries, dependency relationships between features, and acceptance criteria. Progressively break down the product into smaller decision areas, exploring each one in detail. For every decision, identify and resolve its dependencies before moving forward, ensuring that all assumptions are clarified and aligned. Continue this process iteratively until all key aspects of the PRD are well-defined, consistent, and interconnected. Ask one question at a time.
After the interview, summarize the understanding and ask the user to confirm if it is correct. And inform you are ready to generate the PRD.
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.
- 9d ago First seen · 607 lines · 90 tokens per session scan A 86bdf9d9332c
prd-writer is a skill published in the GitHub repository dayvisonassis/sdd-skills (1 stars, last pushed 13d ago), licensed MIT. It adds 90 tokens to every session and 6,381 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 2026-08-31.
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