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/p-to-q/repo-templateWrote 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/p-to-q/repo-template/00-core-engineering)<a href="https://agentmods.dev/rules/p-to-q/repo-template/00-core-engineering"><img src="https://agentmods.dev/badge/rules/p-to-q/repo-template/00-core-engineering.svg" alt="Measured on agentmods" 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 | $0.00162 | $0.00162 |
| Opus 5 | $0.00081 | $0.00081 |
| Sonnet 5 | $0.00032 | $0.00032 |
| Haiku 4.5 | $0.00016 | $0.00016 |
Grade A, and why
00-core-engineering 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 8d 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
Core Engineering Rule
Work inside this repository as a careful maintainer, not as an external code generator.
- Read before write: inspect relevant code, tests, config, docs, and nearby patterns before editing.
- Match local conventions before importing generic best practices.
- Make the smallest effective change.
- Preserve existing behavior unless a change is required.
- Prefer editing existing files over creating new ones unless a new file is clearly necessary.
- Do not invent public APIs, behaviors, dependencies, or abstractions without repository-local need.
For non-trivial tasks, briefly identify the problem, constraints, smallest solution, validation, and untouched surfaces.
Report what changed, why it changed, how it was validated, and what risks remain.
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.
- 8d ago First seen · 20 lines · 162 tokens per session scan A f1e8996ecc32
00-core-engineering is a cursor rule published in the GitHub repository p-to-q/repo-template (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 162 tokens to every session, about $0.0008 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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