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/design-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 | $0.00029 | $0.00152 |
| Opus 5 | $0.00015 | $0.00076 |
| Sonnet 5 | $0.00006 | $0.00030 |
| Haiku 4.5 | $0.00003 | $0.00015 |
Grade A, and why
design-feature scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
@docs/skills/design-feature/SKILL.md contains the full skill specification. Read and follow it completely.
The user's request is to design the feature "$ARGUMENTS".
Follow all phases in order:
- Phase 0: Quiz the user for requirements (8 questions)
- Phase 1: Explore the codebase using the subsystem map
- Phase 2: Write the design doc to docs/
- Phase 3: Break into concrete implementation tasks
Do NOT skip the quiz phase. Do NOT start designing without all answers.
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 · 18 lines · 29 tokens per session scan A 6f5c44a1b1ea
design-feature is a cursor rule published in the GitHub repository janekbaraniewski/openusage (180 stars, last pushed 8d ago), licensed MIT. It adds 29 tokens to every session and 152 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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