Borrowing it
Nothing to install: this file belongs to semiotic-ai/agentsec. 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/semiotic-ai/agentsec/main/AGENTS.mdgit clone --depth 1 https://github.com/semiotic-ai/agentsecWrote 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/semiotic-ai/agentsec/agents-md)<a href="https://agentmods.dev/instructions/semiotic-ai/agentsec/agents-md"><img src="https://agentmods.dev/badge/instructions/semiotic-ai/agentsec/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/semiotic-ai/agentsec/agents-md"><img src="https://agentmods.dev/badge/instructions/semiotic-ai/agentsec/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 | $0.02609 | $0.02609 |
| Opus 5.5 | $0.01044 | $0.01044 |
| Sonnet 5.5 | $0.00522 | $0.00522 |
| Haiku 4.5 | $0.00261 | $0.00261 |
Grade A, and why
agentsec 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 — 184 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md - Project Rules for Agents
This file provides context and rules for Agents when working in the agentsec monorepo.
Package Manager
Use bun everywhere. Do not use npm, yarn, or pnpm.
- Install dependencies:
bun install - Run scripts:
bun run <script> - Add a dependency:
bun add <package> - Add a dev dependency:
bun add -d <package> - Run tests:
bun test
Monorepo Structure
This is a Turborepo monorepo with bun workspaces.
agentsec/
packages/
shared/ @agentsec/shared - Shared types and utilities
scanner/ @agentsec/scanner - Skill scanner engine
metrics/ @agentsec/metrics - Security scoring and metrics
policy/ @agentsec/policy - Policy engine and rules
openclaw/ @agentsec/openclaw - SKILL.md parser/discovery (platform-agnostic: openclaw, hermes, claude, codex)
reporter/ @agentsec/reporter - Report generation
cli/ @agentsec/cli - CLI entry point
Although the openclaw/ package is named for the OpenClaw format that originally seeded the SKILL.md spec, it parses and discovers skills across every agentskills.io-conformant platform agentsec supports: OpenClaw / ClawHub, Hermes (Nous Research), Claude Code, and Codex / skills.sh. New agent platforms that emit SKILL.md files only need a path-default entry in packages/shared/src/defaults/ and an inference rule in packages/shared/src/paths/infer-platform.ts.
Package Naming
- Internal packages:
@agentsec/<name> - The published CLI package:
agentsec
Dependency Graph
shared (types, constants, utilities)
^--- scanner (skill scanning, vulnerability detection)
^--- metrics (security scoring, risk calculation)
^--- policy (policy rules, compliance checks)
^--- openclaw (SKILL.md parsing for openclaw/hermes/claude/codex)
^--- reporter (HTML/JSON/PDF report generation)
cli (command-line interface, published as "agentsec")
depends on ALL 6 packages above
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 · 184 lines · 2,609 tokens per session scan A 2ca8848f087d
agentsec AGENTS.md is an instructions file published in the GitHub repository semiotic-ai/agentsec (5 stars, last pushed 3mo ago), licensed MIT. It adds 2,609 tokens to every session, about $0.0104 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 2026-08-31.
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).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.