Borrowing it
Nothing to install: this file belongs to sernst/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/sernst/skills/main/AGENTS.mdgit clone --depth 1 https://github.com/sernst/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/sernst/skills/agents-md)<a href="https://agentmods.dev/instructions/sernst/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/sernst/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/sernst/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/sernst/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 | $0.00446 | $0.00446 |
| Opus 5.5 | $0.00178 | $0.00178 |
| Sonnet 5.5 | $0.00089 | $0.00089 |
| Haiku 4.5 | $0.00045 | $0.00045 |
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 2mo 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
Repository map
skills/contains reusable MarkdownSKILL.mdinstructions.clis/contains native tools, currentlyskill-manager.- Additional CLIs register in
clis/registry.just; root recipes fan out throughtools/run-registered.ps1.
Build and test
Run from the repository root:
just build # cargo build --locked
just test # cargo test --locked --all-features
just check # complete CI gate
The same recipes run directly from clis/skill-manager. Run just check
before opening a pull request.
Authoritative skill-manager guidance
Any change to command output, prompts, plans, flags, tables, or confirmations
MUST first follow
docs/ux-guidelines.md. It is
authoritative; do not copy an older command's presentation.
Scratch-home safety
Never run a built skill-manager binary against the real user home during
validation. Always pass --home <scratch-dir>; it outranks
SKILL_MANAGER_HOME and the OS home.
To seed realistic scratch state, pass FROM as an already shell-expanded
absolute path, never literal ~ (which resolves against the active scratch
home), and keep the same absolute scratch --home for every command:
$smoke = Join-Path $env:TEMP 'skill-manager-smoke'
skill-manager --home $smoke configs copy $HOME $smoke --yes
skill-manager --home $smoke status
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.
- 2mo ago First seen · 40 lines · 446 tokens per session scan A 79914ef75c86
skills AGENTS.md is an instructions file published in the GitHub repository sernst/skills (9 stars, last pushed yesterday), licensed Apache-2.0. It adds 446 tokens to every session, about $0.0018 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.
skills AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| skills AGENTS.mdsernst/skills | Instructions file | 9 | yesterday | Apache-2.0 | A | 446 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| vscode ai-customization.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 1,907 | GitHub Copilot |