agent-skills: Instructions file for Codex

AGENTS.md

agent-skills AGENTS.md is an instructions file for Codex, OpenCode from supabase/agent-skills. It costs 1,630 tokens per session, scanned A, original, MIT.

Repository guidance for AI coding agents working on a project that packages agent skills. It documents setup, folder layout, commands, testing, and releases.

In plain words
What is it for?
Use it to install dependencies, run tests, find skill files, and follow the repository’s versioning and release process.
Why use it?
It gives the agent the project rules and commands needed to make changes safely and prepare releases consistently.

Instructions file for CodexOpenCode ✓ vendor

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

This is supabase/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 →

About the project

Supabase Agent Skills is a set of instructions, scripts, and resources that help coding agents develop with Supabase, a platform providing databases, authentication, storage, server functions, and related services. Developers use the skills for Supabase application development, PostgreSQL optimization, migrations, security reviews, and integrations. The catalogue entries are the repository's own agent skills, instructions, and MCP support.

supabase/agent-skills · 3,009 stars · on GitHub · supabase.com

Reuse

Borrowing it

Nothing to install: this file belongs to supabase/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/supabase/agent-skills/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/supabase/agent-skills

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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Per session 1,630 This file is loaded in full into every session.
When invoked 1,630 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 $0.01630 $0.01630
Opus 5.5 $0.00652 $0.00652
Sonnet 5.5 $0.00326 $0.00326
Haiku 4.5 $0.00163 $0.00163

Measured 2mo ago against content hash b2810943ae05, 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 · 228 lines

How it starts

The opening of the file, as written. The whole thing — 228 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 with this repository.

Note: CLAUDE.md is a symlink to this file.

Prerequisites

This project uses pnpm for dependency management and task execution. Use the Node.js version declared in .node-version, then install dependencies with pnpm install.

Repository Structure

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

Commands

Run tasks with pnpm.

pnpm install                     # Install dependencies
pnpm test                        # Run tests

Before completing any task, run pnpm test to ensure CI passes.

Releases

This repository uses Release Please on main.

  • Merge conventional commits using feat: and fix: prefixes so Release Please can open or update the release PR.
  • Release Please opens one combined release PR that bumps the root version and the version of any skill whose files were touched. Unrelated skills are not bumped. Do not bump skill versions manually.
  • When the PR is merged, GitHub Actions creates one GitHub release (tag v{version}) with all skill tarballs and index.json. Per-skill packages use skip-github-release: true — no separate GitHub release is created for them, but their metadata.version in SKILL.md and their CHANGELOG.md are committed as part of the release PR.

If you change shipped skill contents under skills/, make sure the change is represented with an appropriate conventional commit so it is included in the next release.

Creating a New Skill

Skills follow the Agent Skills Open Standard.

  1. Create directory: mkdir -p skills/{skill-name}/references
  2. Create SKILL.md following the format below
  3. Add references/_sections.md defining sections
  4. Add reference files: {prefix}-{reference-name}.md
  5. Register the skill in release-please-config.json as a new package and seed its version in .release-please-manifest.json:
    // release-please-config.json — add under "packages":
    "skills/{skill-name}": {
      "release-type": "simple",
      "skip-github-release": true,
      "changelog-path": "skills/{skill-name}/CHANGELOG.md",
      "extra-files": [
        {
          "type": "generic",
          "path": "skills/{skill-name}/SKILL.md",
          "expressions": ["version: \"([0-9]+\\.[0-9]+\\.[0-9]+)\""]
        }
      ]
    }
    
    // .release-please-manifest.json — add:
    "skills/{skill-name}": "0.0.0"
    
  6. Run pnpm test
  7. Commit the new skill with a feat: prefix so Release Please bumps it from 0.0.0 to 0.1.0 on first release. Using fix: would produce 0.0.1 instead.

Read the full file on GitHub · 228 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 · 228 lines · 1,630 tokens per session scan A b2810943ae05

Subscribe to this mod's changes

agent-skills AGENTS.md is an instructions file published in the GitHub repository supabase/agent-skills (3,009 stars, last pushed yesterday), licensed MIT. It adds 1,630 tokens to every session, about $0.0065 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.

Related

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

agent-skills AGENTS.md next to 6 instructions from other repositories
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