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/AGENTS.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/agents-md)<a href="https://agentmods.dev/instructions/heurema/signum/agents-md"><img src="https://agentmods.dev/badge/instructions/heurema/signum/agents-md/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/agents-md"><img src="https://agentmods.dev/badge/instructions/heurema/signum/agents-md.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 | $0.01452 | $0.01452 |
| Opus 5.5 | $0.00581 | $0.00581 |
| Sonnet 5.5 | $0.00290 | $0.00290 |
| Haiku 4.5 | $0.00145 | $0.00145 |
Grade A, and why
signum AGENTS.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.
How it starts
The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Purpose
- Give human and AI contributors a short map of the repo surfaces that matter first.
- Keep repo-specific working rules in one file and link to deeper docs instead of duplicating them.
- Make it obvious which changes are just docs, which change deterministic core behavior, and which change LLM orchestration.
Agent Entry Points
| Surface | Path | Role | Owner | Notes |
|---|---|---|---|---|
| Primary product entry point | commands/signum.md |
Canonical pipeline behavior (CONTRACT -> EXECUTE -> AUDIT -> PACK) |
@vi |
Source of truth for core Signum behavior |
| Init/bootstrap entry point | commands/init.md |
Bootstraps project.intent.md, project.glossary.json, and optional harness docs |
@vi |
Root variant; Claude overlay lives under platforms/claude-code/commands/init.md |
| LLM prompts | agents/ |
Contractor, engineer, reviewer, synthesizer, init synthesizer prompts | @vi |
Changes here affect agent behavior directly |
| Deterministic core | lib/ |
Shell checks, DSL runner, scanners, state/policy helpers | @vi |
Prefer tests for every behavioral change |
| Schemas and contracts | lib/schemas/ |
Contract / proofpack / modules schemas | @vi |
Treat schema changes as compatibility-sensitive |
| Platform overlays | platforms/ |
Surface-specific command/docs variants | @vi |
Root command/docs remain canonical unless an overlay deviation is explicitly documented |
| Codex plugin metadata | .agents/plugins/marketplace.json, .codex-plugin/plugin.json, platforms/codex/.codex-plugin/plugin.json, platforms/codex/SKILL.md |
Codex App marketplace, install manifest, and skill entry point | @vi |
Keep version aligned with .claude-plugin/plugin.json; Codex skill remains an overlay |
| OpenSpec workflow | openspec/config.yaml, .claude/commands/opsx/, .claude/skills/openspec-*/, .codex/skills/openspec-*/ |
Spec-driven change workflow and generated agent entry points | @vi |
Regenerate managed instructions with openspec update; review config changes before regeneration |
| Verification surface | tests/ |
Shell tests for deterministic behavior | @vi |
If a deterministic behavior changes, add/update a test |
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 · 69 lines · 1,452 tokens per session scan A 3374074af85f
signum AGENTS.md is an instructions file published in the GitHub repository heurema/signum (18 stars, last pushed 3mo ago), licensed MIT. It adds 1,452 tokens to every session, about $0.0058 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.