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 GCWing/Sparo-OS --skill product-app-skill-componentgit clone --depth 1 https://github.com/GCWing/Sparo-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/gcwing/sparo-os/product-app-skill-component)<a href="https://agentmods.dev/skills/gcwing/sparo-os/product-app-skill-component"><img src="https://agentmods.dev/badge/skills/gcwing/sparo-os/product-app-skill-component/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/gcwing/sparo-os/product-app-skill-component"><img src="https://agentmods.dev/badge/skills/gcwing/sparo-os/product-app-skill-component.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 | $0.00059 | $0.00376 |
| Opus 5 | $0.00030 | $0.00188 |
| Sonnet 5 | $0.00012 | $0.00075 |
| Haiku 4.5 | $0.00006 | $0.00038 |
Grade A, and why
product-app-skill-component 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
Product App Skill Component Skill
Use this skill when the Product App needs app-specific reusable workflow knowledge. A Skill Component packages guidance for this Product App's behavior or authoring flow; it is not the system prompt, not UI code, and not a shared skill package.
Development Boundary
- Start from the current package facts and generated Skill scaffold. If the skill component is missing, create it with
CreateProductAppComponentusing kindskill. - Edit
source/SKILL.mdfor app-specific workflows, constraints, examples, and decision rules. - Keep Product App API details in implementation code or
product-app-api, and keep visual design guidance inproduct-app-ui-polish. - Keep the guidance narrow enough that the app's Agent or authoring flow can apply it consistently.
Key Decisions
- Use a Skill Component for reusable product/domain procedure, not for one-off notes or package metadata.
- Include examples only when they reduce ambiguity for future app behavior.
- Update the skill when the app's actual workflow changes, so it stays aligned with package behavior and eval fixtures.
- If the skill guides an Agent Component, align it with that agent's
source/prompt.mdand fixtures.
Validation
- Refresh the Product App lock after package or component graph changes.
- Run Product App package validation.
- If the skill affects agent behavior, run Agent Eval or report that eval evidence is missing.
- If the skill affects authoring behavior only, validate package wiring and state which downstream behavior still needs runtime evidence.
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 · 30 lines · 59 tokens per session scan A 389db40b21e4
product-app-skill-component is a skill published in the GitHub repository GCWing/Sparo-OS (20 stars, last pushed 1mo ago), licensed MIT. It adds 59 tokens to every session and 376 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 2026-08-30.
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