agent-skills: Instructions file for Codex

AGENTS.md

agent-skills AGENTS.md is an instructions file for Codex, OpenCode from teableio/agent-skills. It costs 2,015 tokens per session, scanned A, original, MIT.

A contributor guide for creating skills in the agent-skills repository. A skill is a reusable set of instructions that tells a coding agent when and how to perform a task.

In plain words
What is it for?
Use it when adding or updating a skill, including creating its SKILL.md file, choosing a kebab-case directory name, and linking optional reference materials.
Why use it?
It defines the required folder layout, metadata, front matter, and writing rules, helping new skills fit the repository's expected structure.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md.

This is teableio/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 teableio/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/teableio/agent-skills/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/teableio/agent-skills

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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Per session 2,015 This file is loaded in full into every session.
When invoked 2,015 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 $0.02015 $0.02015
Opus 5.5 $0.00806 $0.00806
Sonnet 5.5 $0.00403 $0.00403
Haiku 4.5 $0.00201 $0.00201

Measured 1mo ago against content hash 12d5687f8cb1, 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 1mo 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 · 161 lines

How it starts

The opening of the file, as written. The whole thing — 161 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Contributor Guide

This repository contains a collection of agent skills. Follow these guidelines when contributing.

Repository Structure

skills/
└── <skill-name>/
    ├── SKILL.md           # Required: skill definition with frontmatter
    ├── api-reference/     # Optional: API documentation files
    ├── guides/            # Optional: usage guides
    ├── rules/             # Optional: rule files for compiled skills
    └── metadata.json      # Optional: version and metadata

Creating a New Skill

  1. Create a new directory under skills/ with a descriptive kebab-case name
  2. Add a SKILL.md file with the required frontmatter:
---
name: my-skill-name
description: >-
  A concise description of what the skill does and when to use it.
---
  1. Add supporting files as needed (API references, guides, rules)

SKILL.md Requirements

  • Must include name and description in YAML frontmatter
  • Description should clearly state when the skill should be activated
  • Instructions should be concise and action-oriented
  • Reference supporting files using relative paths

Writing Style for Skill Content

These files are agent skills, not CLI manuals. The reader is an AI agent that can always run teable <cmd> --help at runtime, so:

  • Never restate what --help already says — no flag inventories, no per-command syntax walkthroughs, no one-section-per-command structure.
  • Write the operational knowledge help cannot provide: when to use which command, decision rules ("if you need X, use A; otherwise B"), cross-command workflows, prerequisites, pitfalls, value formats, safe defaults, and warnings for destructive operations.
  • Prefer pitfall tables and decision rules over command catalogs (see the Common Pitfalls table in cli-reference.md for the house style).
  • Examples only where the invocation shape is non-obvious — complex JSON payloads, quoting, multi-step sequences. Trivial invocations need none.
  • Brevity is a feature: skill files are loaded into an agent's context window; every line costs tokens on every task that uses the skill.
  • The reader runs outside Teable-managed sandboxes: this skill is consumed by agents operating @teable/cli in their own environment, never inside a Teable-managed agent sandbox. The manifest's availability markers (managed-sandbox-disabled, sandbox-only) describe runtime gating those readers never encounter — do not thread sandbox-conditional wording through the docs, and do not document sandbox-only command groups (e.g. sandbox tool).

Read the full file on GitHub · 161 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. 1mo ago Changed · +9 lines · +172 tokens per session 12d5687f8cb1
  2. 2mo ago First seen · 152 lines · 1,843 tokens per session scan A 776477208064

Subscribe to this mod's changes

agent-skills AGENTS.md is an instructions file published in the GitHub repository teableio/agent-skills (16 stars, last pushed 13d ago), licensed MIT. It adds 2,015 tokens to every session, about $0.0081 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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agent-skills AGENTS.mdteableio/agent-skillsInstructions file1613d agoMITA2,015Codex, OpenCode
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deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode