agent-skills: Instructions file for Codex

AGENTS.md

agent-skills AGENTS.md is an instructions file for Codex, OpenCode from sitegpt/agent-skills. It costs 749 tokens per session, scanned A, original, MIT.

Repository instructions for the sitegpt/agent-skills project. They explain its file structure, commands, rules for writing skills, and which files are authoritative.

In plain words
What is it for?
Use it when editing or reviewing this repository, especially when creating skill folders, checking required SKILL.md metadata, listing skills, or running the project tests.
Why use it?
Contributors need consistent naming, formatting, testing, and placement rules when changing a shared skills repository.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions .claude-plugin; mentions AGENTS.md.

This is sitegpt/agent-skills's own configuration. It tells Codex and OpenCode how to work on agent-skills itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything agent-skills configures →

Reuse

Borrowing it

Nothing to install: this file belongs to sitegpt/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.

Copy the file
curl -O https://raw.githubusercontent.com/sitegpt/agent-skills/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/sitegpt/agent-skills

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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Per session 749 This file is loaded in full into every session.
When invoked 749 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00749 $0.00749
Opus 5.5 $0.00300 $0.00300
Sonnet 5.5 $0.00150 $0.00150
Haiku 4.5 $0.00075 $0.00075

Measured 2mo ago against content hash 317d5bf70393, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 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.

AGENTS.md · 71 lines

How it starts

The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Guidance for AI coding agents working in this repository.

Overview

This repository contains official SiteGPT skills for AI agents. Skills follow the Agent Skills format used by the skills CLI and skills.sh.

Structure

skills/
  {skill-name}/
    SKILL.md
    commands/ (optional)
    playbooks/ (optional)

Commands

npm test
npx skills add . --list

Run npm test before committing changes.

Skill Rules

  • SKILL.md must include YAML frontmatter with name, description, license, and metadata.version.
  • The name must match the skill directory name.
  • Use lowercase kebab-case skill names.
  • The description is the trigger text agents see before loading the full skill, so include what the skill does and when to use it.
  • Keep SKILL.md focused on agent behavior and core workflows.
  • commands/ and playbooks/ are optional. Use them only when a skill is large enough that splitting genuinely helps; otherwise a single self-contained SKILL.md (up to 1000 lines) is fine and avoids drift.
  • Do not include secrets, credentials, private customer data, or environment-specific tokens.

Source Of Truth For sitegpt-cli

The sitegpt-cli skill is synced, not authored here. Its canonical source is the SiteGPT product repo at public/agents/sitegpt-cli-skill.md (the file served at https://sitegpt.ai/agents/sitegpt-cli-skill.md and digest-verified there). To change this skill, edit it in the product repo, then copy the body here under this repo's frontmatter and bump the version. Do not edit skills/sitegpt-cli/SKILL.md directly or re-split it into commands//playbooks/ — that re-introduces the exact drift this consolidation removed.

Versioning

This repository uses manual releases.

  • package.json, .claude-plugin/plugin.json, .cursor-plugin/plugin.json, and the root plugin.json (the Agent Plugins manifest) carry the RELEASE version and must match (validate-skills.mjs checks).
  • Each SKILL.md metadata.version tracks that skill's own content: bump it when the skill changes, leave it alone when it does not. A release version ahead of an unchanged skill's version is expected in a multi-skill repo.
  • sitegpt-cli is the exception either way: its version follows its canonical source in the product repo (see above) and only moves on a sync.
  • Update CHANGELOG.md when making release commits.
  • Use release commit messages like chore: release 0.1.2.
  • Create a matching Git tag such as v0.1.2.
  • GitHub Releases are optional unless a packaged archive is needed.

Read the full file on GitHub · 71 lines

Changes

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.

  1. 2mo ago First seen · 71 lines · 749 tokens per session scan A 317d5bf70393

Subscribe to this mod's changes

agent-skills AGENTS.md is an instructions file published in the GitHub repository sitegpt/agent-skills (0 stars, last pushed 2mo ago), licensed MIT. It adds 749 tokens to every session, about $0.0030 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.

Related

agent-skills AGENTS.md compared with instructions from other repositories

agent-skills AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
agent-skills AGENTS.mdsitegpt/agent-skillsInstructions file02mo agoMITA749Codex, OpenCode
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vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode