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open-agent-kit: Instructions file for Codex

AGENTS.md

open-agent-kit AGENTS.md is an instructions file for Codex, OpenCode from goondocks-co/open-agent-kit. It costs 854 tokens per session, scanned A, a copy of open-agent-kit copilot-instructions.md, MIT.

Contributor instructions for Open Agent Kit, an AI coding-agent project. They require agents to follow the repository constitution, search for existing patterns, run checks, and keep documentation aligned with code.

In plain words
What is it for?
Implementing and reviewing changes in Open Agent Kit, running its make check quality gate, and updating related documentation.
Why use it?
They reduce inconsistent implementations by defining the project’s source of truth, required checks, and rules for changing established patterns.

Instructions file for CodexOpenCode

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

This is goondocks-co/open-agent-kit's own configuration. It tells Codex and OpenCode how to work on open-agent-kit 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 open-agent-kit configures →

not rated 10repo 3mo ago A scan 854 tokens copy · 84% MIT
View source ↗ goondocks-co/open-agent-kit openagentkit.app
Reuse

Borrowing it

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

Made for: Codex, OpenCode.

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Per session 854 This file is loaded in full into every session.
When invoked 854 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 84% copy Near-identical to another mod 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 $0.00854 $0.00854
Opus 5.5 $0.00342 $0.00342
Sonnet 5.5 $0.00171 $0.00171
Haiku 4.5 $0.00085 $0.00085

Measured 1mo ago against content hash 47656b8a1cdd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

open-agent-kit 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.

Origin

This is a copy

84% identical to open-agent-kit copilot-instructions.md — 24 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

AGENTS.md · 80 lines

How it starts

The opening of the file, as written. The whole thing — 80 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Instructions for AI Contributors

You are an AI coding agent working in this repository.

Source of truth (hard rules)

Read and follow oak/constitution.md. It is the authoritative specification for architecture, conventions, golden paths, and quality gates.

  • If anything conflicts with oak/constitution.md, oak/constitution.md wins.
  • If you are unsure how to apply a rule, stop and ask rather than guessing.
  • The canonical Anchor Index lives in oak/constitution.md.

Required workflow

  1. Read oak/constitution.md (especially the golden paths + hard rules + DoD).
  2. Search first: find the closest existing implementation and mirror it (use the Top Anchors below).
  3. Implement the change following the constitution.
  4. Run the quality gate: make check (must pass).
  5. Update docs to prevent drift:
    • Review/update README if behavior/workflows changed.
    • Update the relevant feature docs (or create them) when touching feature behavior.
  6. If a better pattern is needed:
    • Record the decision (RFC for formal, doc for informal) and update rules/docs so the new pattern becomes standard.

Non-negotiables

  • No magic strings or numbers anywhere (including tests).
  • Prefer proper engineering over shortcuts; fix root causes, not symptoms.
  • Commands should be idempotent by default.
  • Templates shipped by OAK are managed by OAK and overwritten on upgrade (no user overrides).
  • Narrow lanes for deviation; when unclear, ask.

Editable install (MUST preserve)

MUST NOT run uv tool install or uv pip install without the -e flag. Always use make setup or make sync instead of ad-hoc install commands. See §7.3 of oak/constitution.md for the full rule, rationale, and verification command.

Top Anchors (shorthand)

These are the first places to look. The full Anchor Index is in oak/constitution.md.

Add a New Feature (vertical slice exemplar)

  • src/open_agent_kit/features/strategic_planning/manifest.yaml
  • src/open_agent_kit/features/strategic_planning/rfc.py
  • src/open_agent_kit/features/strategic_planning/commands/
  • src/open_agent_kit/features/strategic_planning/templates/

Read the full file on GitHub · 80 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 First seen · 80 lines · 854 tokens per session scan A 47656b8a1cdd

Subscribe to this mod's changes

open-agent-kit AGENTS.md is an instructions file published in the GitHub repository goondocks-co/open-agent-kit (10 stars, last pushed 3mo ago), licensed MIT. It adds 854 tokens to every session, about $0.0034 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 84% identical to open-agent-kit copilot-instructions.md, differing in 24 lines, and is treated as a copy.

Claude Codeagentic-aiai-agentsclaude-agent-sdkcodex-clicopilot
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