Borrowing it
Nothing to install: this file belongs to heurema/signum. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/heurema/signum/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/heurema/signumWrote 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/instructions/heurema/signum/copilot-instructions)<a href="https://agentmods.dev/instructions/heurema/signum/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/heurema/signum/copilot-instructions/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/instructions/heurema/signum/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/heurema/signum/copilot-instructions.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 | $0.00279 | $0.00279 |
| Opus 5.5 | $0.00112 | $0.00112 |
| Sonnet 5.5 | $0.00056 | $0.00056 |
| Haiku 4.5 | $0.00028 | $0.00028 |
Grade A, and why
signum copilot-instructions.md 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 1mo 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
Signum Copilot Review Instructions
Review code only after the PR intake gate is satisfied (intake/pass or maintainer override). If intake is not satisfied, focus on the missing intent/risk signal instead of detailed code style.
Priorities, in order:
- Correctness and regressions.
- Security and trust boundaries.
- Maintainability and minimal scope.
- Minimal dependencies.
Flag risky changes in:
.github/workflows/**and custom GitHub Actions.- Dependencies, lockfiles, install scripts, Docker files, and release wiring.
- Auth, security, crypto, subprocess/shell/eval, and file-system execution paths.
- Public APIs, schemas, command behavior, and runtime behavior.
Do not recommend new dependencies unless the benefit is explicit and smaller stdlib/built-in options are insufficient.
Do not treat stylistic issues as blockers unless they affect correctness, security, maintainability, or contributor usability.
Keep public review comments concise, polite, and actionable. Do not publish contributor trust scores.
Repo map:
commands/signum.mdis the canonical Signum pipeline surface.commands/init.mdis the canonical init/bootstrap surface.agents/contains LLM prompt surfaces.lib/contains deterministic behavior.lib/schemas/is compatibility-sensitive.tests/contains verification.
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.
- 1mo ago First seen · 30 lines · 279 tokens per session scan A 4ae4a7427c5c
signum copilot-instructions.md is an instructions file published in the GitHub repository heurema/signum (18 stars, last pushed 3mo ago), licensed MIT. It adds 279 tokens to every session, about $0.0011 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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