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skills: Instructions file for Codex

AGENTS.md

skills AGENTS.md is an instructions file for Codex, OpenCode from oldwinter/skills. It costs 1,117 tokens per session, scanned A, original, MIT.

Repository instructions for the skills project, which contains reusable instructions for AI coding work. They describe its structure, shared paths for multiple agents, and build, lint, and test commands.

In plain words
What is it for?
Guiding changes to the skills repository and running its build, lint, and test checks.
Why use it?
They help agents understand how the repository is organised and how to check their changes. Linting is an automated check for common code problems and style issues.

Instructions file for CodexOpenCode

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

This is oldwinter/skills's own configuration. It tells Codex and OpenCode how to work on 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 skills configures →

not rated 10repo changed 10d ago A scan 1,117 tokens original MIT
View source ↗ oldwinter/skills
Reuse

Borrowing it

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

Made for: Codex, OpenCode.

Wrote 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.

agentmods badge for skills AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/oldwinter/skills/agents-md/github.svg)](https://agentmods.dev/instructions/oldwinter/skills/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/oldwinter/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/oldwinter/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.

agentmods 80×15 button for skills AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/oldwinter/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/oldwinter/skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,117 This file is loaded in full into every session.
When invoked 1,117 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 $0.01117 $0.01117
Opus 5.5 $0.00447 $0.00447
Sonnet 5.5 $0.00223 $0.00223
Haiku 4.5 $0.00112 $0.00112

Measured 10d ago against content hash b40f74421afb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

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 10d 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 · 38 lines

How it starts

The opening of the file, as written. The whole thing — 38 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Public, Markdown-first skills library. CLAUDE.md is a symlink to this file.

This repo owns reusable Skill implementations only. Device inventory, consumer enablement and routing, automations, personal memory, and install evidence belong to private oldwinter/general-tasks; machine and harness config belongs to private oldwinter/dotfiles.

Layout

  • A skill is a directory named by its identifier (hyphen-case) with a required SKILL.md and optional references/, rules/, scripts/, agents/ (harness metadata), tests/, examples/; forked skills also carry LICENSE and NOTICE.md.
  • Skills live at the repo root, except Obsidian ones under obsidian-skills/. Only skills in use stay on main; third-party skills are installed from their upstream, not copied here.
  • Retired skills are removed from main and listed under README → 归档. archive/2026-10-13 is the pre-cleanup snapshot tag; anything retired later lives in git history. Restore with git checkout <ref> -- <path>.
  • Adding, removing, or renaming a skill means updating the README list; just check enforces it.

Skill rules

  • Keep every skill usable outside this owner's machines: no credentials, private sessions, personal memory, private hostnames, or hardcoded device paths; use placeholders or public interfaces in examples.
  • SKILL.md frontmatter is parsed by scripts: --- delimited, name: and description: as single-line scalars (no > block scalars), no angle brackets in description. A description containing : must be quoted: an unquoted one is invalid YAML, and the install CLI skips that skill silently, so the install looks like it worked while the skill is missing.
  • agents/openai.yaml, when present, advertises the display name, default prompt, and implicit-invocation policy to harnesses that read it. The checker validates it when present: interface.display_name / interface.short_description / interface.default_prompt (which must invoke $<skill-name>) and a boolean policy.allow_implicit_invocation that must agree with the SKILL.md marker (see Skill invocation).

Read the full file on GitHub · 38 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. 10d ago Changed · +13 lines · +379 tokens per session b40f74421afb
  2. 11d ago Changed · +1 lines · +128 tokens per session e26d9c54ba8e
  3. 12d ago Changed · +2 lines · +257 tokens per session d55000fd29ab
  4. 17d ago Changed · -39 tokens per session 75110b57f252
  5. 1mo ago Changed · -109 lines · -895 tokens per session 0587d8ca4bcc
  6. 1mo ago Changed a35286b83d54
  7. 2mo ago First seen · 131 lines · 1,287 tokens per session scan A 1aab6ee9e19c

Subscribe to this mod's changes

skills AGENTS.md is an instructions file published in the GitHub repository oldwinter/skills (10 stars, last pushed 10d ago), licensed MIT. It adds 1,117 tokens to every session, about $0.0045 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.

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