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.
git clone --depth 1 https://github.com/Lawofall/AgentCoreWrote 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/rules/lawofall/agentcore/prompt-design)<a href="https://agentmods.dev/rules/lawofall/agentcore/prompt-design"><img src="https://agentmods.dev/badge/rules/lawofall/agentcore/prompt-design/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/rules/lawofall/agentcore/prompt-design"><img src="https://agentmods.dev/badge/rules/lawofall/agentcore/prompt-design.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 | $0.00057 | $0.01318 |
| Opus 5.5 | $0.00023 | $0.00527 |
| Sonnet 5.5 | $0.00011 | $0.00264 |
| Haiku 4.5 | $0.00006 | $0.00132 |
Grade A, and why
prompt-design 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 5d 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.
The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
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.
- 5d ago Changed 5f50fbec83bb
- 8d ago Changed · +25 lines · +20 tokens per session e632cb63df1c
- 15d ago Changed · -448 tokens per session eaf08cce8827
- 22d ago Changed · -94 tokens per session 035ec3b5605f
- 1mo ago Changed · +1 lines · +96 tokens per session 32eee1a8d788
- 1mo ago Changed · -3 lines · -418 tokens per session 20eb88a4c3ad
- 1mo ago Changed · +153 tokens per session 410ef2b47b8f
- 1mo ago Changed · +1 lines · +115 tokens per session bb7fc5d41ab0
- 1mo ago Changed · +31 tokens per session 4cc243b19174
- 1mo ago First seen · 16 lines · 602 tokens per session scan A 0519fc21bcff
prompt-design is a cursor rule published in the GitHub repository Lawofall/AgentCore (90 stars, last pushed 4d ago), with no licence file. It adds 57 tokens to every session and 1,318 once invoked, about $0.0002 per session on Opus 5.5. 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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