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 Cristhianzl/claude-skills-czl --skill writing-prdgit clone --depth 1 https://github.com/Cristhianzl/claude-skills-czlWrote 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/cristhianzl/claude-skills-czl/writing-prd)<a href="https://agentmods.dev/skills/cristhianzl/claude-skills-czl/writing-prd"><img src="https://agentmods.dev/badge/skills/cristhianzl/claude-skills-czl/writing-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.
<a href="https://agentmods.dev/skills/cristhianzl/claude-skills-czl/writing-prd"><img src="https://agentmods.dev/badge/skills/cristhianzl/claude-skills-czl/writing-prd.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 | $0.00156 | $0.02005 |
| Opus 5 | $0.00078 | $0.01002 |
| Sonnet 5 | $0.00031 | $0.00401 |
| Haiku 4.5 | $0.00016 | $0.00200 |
Grade A, and why
writing-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 12d 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 — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Writing a PRD
Produce a product requirements artifact that states the problem before the solution, ties to a measurable outcome, makes non-goals explicit, and defines acceptance criteria a team can test. The PRD is the what and why; the how belongs in a separate engineering design doc. Match the artifact's weight to the bet's scope and risk — a one-pager for a small change, a full PRD for a new product, a PR-FAQ for a strategic bet whose desirability is unproven.
Read first (always)
List learnings/ and read every file relevant to the current product area, team, or artifact type. Project-specific section templates, required metrics, approval workflows, naming, or "what counts as a non-goal here" live there and override the defaults in this SKILL.md. If a learning conflicts with this file, the learning wins — mention it to the user.
If learnings/ holds only its README, proceed with the defaults below.
Workflow
-
Decide whether — and what — to write. Run a lightweight opportunity assessment before committing to a heavy artifact. Use the SVPG/Cagan 10 questions (Inspired, Marty Cagan): what problem, for whom, how big is the opportunity, what alternatives exist, why are we best suited, why now, how will we go to market, how will we measure success, what are the critical factors to succeed, and — given all that — what is the recommendation. For strategic or ambiguous bets where desirability/viability is unproven, write the Amazon PR-FAQ first (see references/pr-faq.md). → verify: you can state the problem and the target user in one sentence each, without naming a solution.
-
Pick the artifact weight. One-pager / mini-PRD for a small, well-understood change (roughly < 2 weeks, one team). Full PRD for a new product, cross-functional work, or higher risk/ambiguity. PR-FAQ for a strategic bet where the value is not yet validated. When in doubt, start lighter and grow the artifact — never start with a heavyweight template for a small change. → verify: the weight matches scope, risk, and audience; you can justify the choice in one line.
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.
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.
- 12d ago First seen · 81 lines · 156 tokens per session scan A 971c25cf59e9
writing-prd is a skill published in the GitHub repository Cristhianzl/claude-skills-czl (5 stars, last pushed yesterday), licensed MIT. It adds 156 tokens to every session and 2,005 once invoked, about $0.0008 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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