Borrowing it
Nothing to install: this file belongs to lc-rezende/AI-Custom-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/lc-rezende/AI-Custom-Skills/main/AGENTS.mdgit clone --depth 1 https://github.com/lc-rezende/AI-Custom-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/lc-rezende/ai-custom-skills/agents-md)<a href="https://agentmods.dev/instructions/lc-rezende/ai-custom-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/lc-rezende/ai-custom-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/lc-rezende/ai-custom-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/lc-rezende/ai-custom-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 | $0.00991 | $0.00991 |
| Opus 5 | $0.00495 | $0.00495 |
| Sonnet 5 | $0.00198 | $0.00198 |
| Haiku 4.5 | $0.00099 | $0.00099 |
Grade A, and why
AI-Custom-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 9d 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 — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file is guidance for agentic coding tools working in this repository. Follow it first, then defer to repo docs and the Agent Skills specification.
Repository purpose
- This repo stores reusable Agent Skills aligned to https://agentskills.io.
- Skills are Markdown-first, with optional scripts, references, and assets.
- Treat this repo as documentation + examples, not a production service.
Sources of truth
PRD.mdfor goals, constraints, and acceptance criteria.CONTRIBUTION.mdfor contribution workflow and standards.- Agent Skills spec: https://agentskills.io/specification
- Best practices: https://agentskills.io/skill-creation/best-practices
Build, lint, and test commands
There is no app build, lint, or unit test suite in the root repo. Validation is done per-skill using the Agent Skills reference validator.
Skills validation (primary check)
Setup (submodule + tools):
git submodule update --init --recursive
cd third_party/agentskills/skills-ref
uv sync
source .venv/bin/activate
Validate a single skill (preferred single-target check):
skills-ref validate /path/to/skill
Examples for this repo:
skills-ref validate ./sample-skill
skills-ref validate ./sample-skill-advanced
If skills-ref is not on PATH, use the venv executable:
third_party/agentskills/skills-ref/.venv/bin/skills-ref validate ./sample-skill
Code style and structure guidelines
Skill directory layout
- Each non-sample skill lives under
skills/and is a folder containing a requiredSKILL.md. - Optional folders:
scripts/,references/,assets/. - Keep the layout shallow and consistent with sample skills.
SKILL.md frontmatter rules (required)
namemust match the folder name.- Use lowercase letters, numbers, and hyphens only.
- No leading/trailing hyphens, no consecutive hyphens.
descriptionmust be clear about what the skill does and when to use it.- Optional fields must follow the spec (
license,compatibility,metadata).
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.
- 9d ago First seen · 143 lines · 991 tokens per session scan A 32439d31d280
AI-Custom-Skills AGENTS.md is an instructions file published in the GitHub repository lc-rezende/AI-Custom-Skills (1 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 991 tokens to every session, about $0.0050 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
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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).
langchain AGENTS.md
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