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 agentmods add rules/janekbaraniewski/openusage/develop-featuregit clone --depth 1 https://github.com/janekbaraniewski/openusageWhat 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 | $0.00027 | $0.00193 |
| Opus 5 | $0.00014 | $0.00097 |
| Sonnet 5 | $0.00005 | $0.00039 |
| Haiku 4.5 | $0.00003 | $0.00019 |
Grade A, and why
develop-feature scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
@docs/skills/develop-feature/SKILL.md contains the full skill specification. Read and follow it completely.
The user's request is to develop the feature "$ARGUMENTS" through the full lifecycle.
This orchestrates all phases:
- Phase 0: Intake — check for existing design doc, confirm scope
- Phase 1: Design (design-feature skill)
- Phase 2: Review (review-design skill)
- Phase 3: Implement (implement-feature skill)
- Phase 4: Validate (validate-feature skill)
- Phase 5: Iterate (iterate-feature skill)
- Phase 6: Finalize (finalize-feature skill)
- Phase 7: Summary
Pause for user confirmation between each phase.
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.
- 2d ago First seen · 22 lines · 27 tokens per session scan A 1921cb14a775
develop-feature is a cursor rule published in the GitHub repository janekbaraniewski/openusage (180 stars, last pushed 8d ago), licensed MIT. It adds 27 tokens to every session and 193 once invoked, about $0.0001 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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