Borrowing it
Nothing to install: this file belongs to coroboros/agent-skills. 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/coroboros/agent-skills/main/AGENTS.mdgit clone --depth 1 https://github.com/coroboros/agent-skillsWrote 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/coroboros/agent-skills/agents-md)<a href="https://agentmods.dev/instructions/coroboros/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/coroboros/agent-skills/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/coroboros/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/coroboros/agent-skills/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 | $0.00625 | $0.00625 |
| Opus 5.5 | $0.00250 | $0.00250 |
| Sonnet 5.5 | $0.00125 | $0.00125 |
| Haiku 4.5 | $0.00063 | $0.00063 |
Grade A, and why
agent-skills 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 — 35 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Skills
Public collection of installable AI agent skills for Claude Code and compatible agents. Each skill is a self-contained folder in skills/ with a SKILL.md at its root.
Project constraints
- Bundled scripts use Bash and Python 3 (stdlib only); the org-wide Bun preference does not apply. Skills declare external CLI prerequisites in
SKILL.mdand fail with exact install and rerun guidance when an applicable tool is missing. They do not resolve tool packages at runtime. Skills that create projects or packages may install the requested dependencies. - Skills install independently. Do not assume sibling skills are installed; follow
.agents/rules/repo-conventions.mdfor cross-skill cooperation. User documentation lives in the root README, with no per-skill root README.
Rule index
Read the rules relevant to the task before acting. Reuse unchanged guidance already read in this session.
.agents/rules/behavior.md- canonical behavior discipline: production-grade, size budget, surgical, fail-loud, never-invent..agents/rules/behavior-frontier.md- Frontier addendum — model scope stated in the file.
The behavior rules above govern every task within their stated scope.
- Authoring or evaluating a skill: read
.agents/rules/skill-authoring.mdand use the official Anthropicskill-creator. - Frontmatter, layout, or portability: read
.agents/rules/agentskills-spec.md; read.agents/rules/claude-code-skills.mdfor Claude Code extensions and substitutions. - Flags, output paths, installation, marketplace, or CI changes: read
.agents/rules/repo-conventions.md. - Adding, changing, or removing tests: read Testing for regression value, coverage preservation, and execution limits.
- Shared skill instructions: edit the owning
.agents/rules/skill-{prose,label-hygiene,execution-discipline,adversarial-verification}-rules.mdblock or.agents/rules/skill-quality-lens-rules.md. These sources declare their recipients; the sync script updates the bundled copies.
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 Changed · -128 tokens per session d4e0107dfaac
- 1mo ago Changed · +1 lines · +40 tokens per session c9df97be5c89
- 1mo ago Changed · +3 tokens per session 892a44c2e039
- 2mo ago First seen · 34 lines · 710 tokens per session scan A c5a6915fc421
agent-skills AGENTS.md is an instructions file published in the GitHub repository coroboros/agent-skills (4 stars, last pushed yesterday), licensed MIT. It adds 625 tokens to every session, about $0.0025 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).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.