Accordion: Instructions file for Codex

AGENTS.md

Accordion AGENTS.md is an instructions file for Codex, OpenCode from a-Fig/Accordion. It costs 391 tokens per session, scanned A, original, MIT.

Project instructions for AI coding agents working on a software project. They require changes to happen in a separate Git worktree, which is an additional working folder tied to its own branch.

In plain words
What is it for?
They guide agents through creating and removing worktrees, choosing the correct base branch, running checks, and avoiding conflicts between development servers.
Why use it?
They reduce accidental changes to the main checkout and keep development, testing, commits, and pull requests on an isolated branch.

Instructions file for CodexOpenCode

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

This is a-Fig/Accordion's own configuration. It tells Codex and OpenCode how to work on Accordion 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 Accordion configures →

Reuse

Borrowing it

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

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 Accordion AGENTS.md

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

Your own site · 80×15
<a href="https://agentmods.dev/instructions/a-fig/accordion/agents-md"><img src="https://agentmods.dev/badge/instructions/a-fig/accordion/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 391 This file is loaded in full into every session.
When invoked 391 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 $0.00391 $0.00391
Opus 5.5 $0.00156 $0.00156
Sonnet 5.5 $0.00078 $0.00078
Haiku 4.5 $0.00039 $0.00039

Measured 1mo ago against content hash 7dce15fe4986, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Accordion 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 · 24 lines

What it actually says

Read the entirety of @CLAUDE.md

Worktree convention

Before making any changes to the code, always open a dedicated worktree — never edit in the main checkout.

  1. Create a worktree off the latest devmain, placed under .pi/worktrees/ (already gitignored):
    git fetch origin
    git worktree add .pi/worktrees/<short-descriptive> -b <branch> origin/devmain
    cd .pi/worktrees/<short-descriptive>
    
  2. Do all work in the worktree — edits, npm install (deps are per-worktree), verification (npm run check, npm run test, node smoke.mjs, npm pack --dry-run as applicable), commits, and the PR to devmain.
  3. Delete the worktree and its folder once the branch is merged into devmain (or promoted to main):
    cd <main checkout>
    git worktree remove .pi/worktrees/<short-descriptive>
    git branch -d <branch>   # safe once merged; use -D only if the branch was abandoned
    
  4. Notes:
    • The main checkout stays on main (the stable, registered-binary surface). Never branch from or PR into main directly — see CLAUDE.md → Branching & PR workflow.
    • Only one worktree may run the UI server on port 1420 at a time (npm run dev / tauri dev). Other concurrent worktrees should rely on npm run check / npm run test / node smoke.mjs, which claim no port.
    • If the branch is abandoned without merging, still git worktree remove it so .pi/worktrees/ doesn't accumulate stale trees.
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 First seen · 24 lines · 391 tokens per session scan A 7dce15fe4986

Subscribe to this mod's changes

Accordion AGENTS.md is an instructions file published in the GitHub repository a-Fig/Accordion (247 stars, last pushed 28d ago), licensed MIT. It adds 391 tokens to every session, about $0.0016 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

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