Borrowing it
Nothing to install: this file belongs to helderberto/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/helderberto/agent-skills/main/AGENTS.mdgit clone --depth 1 https://github.com/helderberto/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/helderberto/agent-skills/agents-md)<a href="https://agentmods.dev/instructions/helderberto/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/helderberto/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/helderberto/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/helderberto/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 | $0.02087 | $0.02087 |
| Opus 5.5 | $0.00835 | $0.00835 |
| Sonnet 5.5 | $0.00417 | $0.00417 |
| Haiku 4.5 | $0.00209 | $0.00209 |
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 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.
How it starts
The opening of the file, as written. The whole thing — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Guidance for AI coding agents (Claude Code, Cursor, Gemini CLI, OpenCode, Copilot, etc.) when working with this repository.
Repository Overview
helderberto/agent-skills is a personal SDLC toolbelt for AI coding agents. Skills are packaged Markdown instructions that extend agent capabilities across the full lifecycle — from spec to ship.
Project Structure
skills/ → Core skills (one folder per skill, each with SKILL.md)
agents/ → Subagent definitions the skills fan out to (Claude Code only)
docs/ → Setup guides per agent (Cursor, Antigravity CLI, Gemini CLI, OpenCode, GitHub Copilot, Codex)
.claude-plugin/ → Plugin manifest + marketplace entry (Claude Code)
plugin.json → Plugin manifest (Antigravity CLI)
.agents/plugins/ → Marketplace entry (Codex)
.plugin/ → Copy of .claude-plugin/plugin.json (Copilot CLI reads it first)
Integration Model
Different agents discover skills through different mechanisms. This repo supports all of them through one source of truth — the skills/ directory.
| Agent | Discovery mechanism |
|---|---|
| Claude Code | Plugin marketplace (/plugin install hb@helderberto-skills) |
| Gemini CLI | gemini skills install from this repo |
| OpenCode | Auto-routes via this AGENTS.md + the skill tool |
| Cursor | Sync skills/ into .cursor/skills/ (native skills) |
| Antigravity CLI | Native plugin via root plugin.json (agy plugin install) |
| GitHub Copilot | Native plugin from .claude-plugin/marketplace.json (copilot plugin install hb@helderberto-skills) |
| Codex | Native plugin via .agents/plugins/marketplace.json (codex plugin add hb@helderberto-skills) |
See docs/ for per-agent setup instructions.
OpenCode Integration
OpenCode uses a skill-driven execution model — the agent reads this file plus the skills/ directory and auto-routes user intent to the right skill.
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 Changed · +1 lines · +17 tokens per session 9c94eec86f34
- 6d ago Changed · +1 lines · +21 tokens per session fb7d05ae3fa0
- 7d ago Changed · +11 lines · +394 tokens per session cc9a1657946a
- 10d ago Changed · +4 lines · +124 tokens per session 78c3eeb4f858
- 1mo ago Changed · +1 lines · +22 tokens per session f5545d599713
- 1mo ago First seen · 108 lines · 1,509 tokens per session scan A 64edeacc008b
agent-skills AGENTS.md is an instructions file published in the GitHub repository helderberto/agent-skills (17 stars, last pushed 2d ago), licensed MIT. It adds 2,087 tokens to every session, about $0.0083 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 2026-08-30.
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.