Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/sernst/skills/agents-mdgit clone --depth 1 https://github.com/sernst/skillsWhat 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 | $0.00446 | $0.00446 |
| Opus 5 | $0.00223 | $0.00223 |
| Sonnet 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 2d 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.
- 2d 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 (2 stars, last pushed 3d ago), licensed Apache-2.0. It adds 446 tokens to every session, about $0.0022 per session on Opus 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).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
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langchain AGENTS.md
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vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.