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 Karthick-Ramachandran/persist-os --skill create-prdgit clone --depth 1 https://github.com/Karthick-Ramachandran/persist-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/karthick-ramachandran/persist-os/create-prd)<a href="https://agentmods.dev/skills/karthick-ramachandran/persist-os/create-prd"><img src="https://agentmods.dev/badge/skills/karthick-ramachandran/persist-os/create-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/karthick-ramachandran/persist-os/create-prd"><img src="https://agentmods.dev/badge/skills/karthick-ramachandran/persist-os/create-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 | $0.00055 | $0.00449 |
| Opus 5 | $0.00028 | $0.00225 |
| Sonnet 5 | $0.00011 | $0.00090 |
| Haiku 4.5 | $0.00006 | $0.00045 |
Grade A, and why
create-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 10d 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.
What it actually says
Skill: Create PRD
Purpose
Create a useful feature PRD that helps humans and AI agents understand what should be built and why.
Inputs
- Feature name or problem statement.
- User goal or business reason.
- Any existing product notes, tickets, or change requests.
Required Reading
docs/00-product/BRD.mddocs/00-product/PRD.md- Relevant existing
docs/40-features/<feature>/ - Relevant accepted ADRs in
docs/adrs/
Output Files
docs/40-features/<feature>/PRD.mddocs/40-features/<feature>/ACCEPTANCE.md, when acceptance criteria are part of the request.docs/40-features/<feature>/CHANGE_REQUESTS.md, when changing existing requirements.
Process
- Identify the user, problem, desired outcome, and non-goals.
- Link the feature to product goals and existing source-of-truth docs.
- Define acceptance criteria that can be tested.
- Capture security, privacy, file write, dependency, and MCP implications.
- Identify architecture areas that require follow-up review.
- Keep the PRD concise and implementation-guiding.
Stop Conditions
Stop and request human decision if:
- Product intent is contradictory.
- A requested behavior conflicts with an accepted ADR.
- The feature adds network, telemetry, AI API, cloud, MCP runtime, auth, secrets, or file write behavior without explicit approval.
- Scope is too broad to define testable acceptance criteria.
Quality Bar
- The PRD states goals, non-goals, users, acceptance criteria, risks, and source links.
- Acceptance criteria are concrete enough to drive tests.
- Security and architecture implications are not generic filler.
- The PRD does not duplicate full architecture docs.
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.
- 10d ago First seen · 59 lines · 55 tokens per session scan A a390dbc62f78
create-prd is a skill published in the GitHub repository Karthick-Ramachandran/persist-os (8 stars, last pushed 2mo ago), licensed MIT. It adds 55 tokens to every session and 449 once invoked, about $0.0003 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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