Borrowing it
Nothing to install: this file belongs to mryll/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/mryll/skills/main/AGENTS.mdgit clone --depth 1 https://github.com/mryll/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/mryll/skills/agents-md)<a href="https://agentmods.dev/instructions/mryll/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/mryll/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/mryll/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/mryll/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 | $0.00263 | $0.00263 |
| Opus 5.5 | $0.00105 | $0.00105 |
| Sonnet 5.5 | $0.00053 | $0.00053 |
| Haiku 4.5 | $0.00026 | $0.00026 |
Grade A, and why
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.
What it actually says
AGENTS.md
Markdown-first skills collection — no build, tests, or linters. Skills may ship small helper scripts under skills/<name>/scripts/.
Skill File Format
- Each skill lives at
skills/<name>/SKILL.mdwith YAML frontmatter (name,description,version). descriptionMUST be a single-line string — never a YAML block scalar (|or>); block scalars break skill registration.- Keep
description≤1024 chars, or Codex CLI silently skips the skill. - Quote
descriptionin single quotes if it contains a colon followed by a space (archivo: "x"): unquoted, YAML reads it as a nested mapping and the skill fails to parse. - Optional
references/subdirectory for supporting docs, linked from SKILL.md.
Non-Obvious Rules
- Keep skills self-contained: each SKILL.md must work standalone, with no dependency on other skills.
- Register every new skill in
.claude-plugin/marketplace.json(theskillsarray) or it won't be published. - The skills.sh renderer crashes on Markdown tables and zero-width-char fence hacks in SKILL.md — use bullet lists and 4-backtick outer fences instead.
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 · +1 lines · +41 tokens per session 7d1c75f3b89f
- 1mo ago First seen · 17 lines · 222 tokens per session scan A 3e4a0bc9391d
skills AGENTS.md is an instructions file published in the GitHub repository mryll/skills (6 stars, last pushed 13d ago), licensed MIT. It adds 263 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 2026-08-31.
Other instructions, from other repositories
ai-agent-rules-generator agent-observations.instructions.md
Mandatory agent observation logging — anomalies, recommendations, and critical findings must be disclosed before commit.
ai-agent-rules-generator doc-sync.instructions.md
Documentation sync rules — which docs to update when code changes.
ai-agent-rules-generator ratelimitting.instructions.md
Instructions for savedpixel/ai-agent-rules-generator, covering rate limit prevention (critical), rules, output length limits and visibility.
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).