agents: Instructions file for Codex

AGENTS.md

agents AGENTS.md is an instructions file for Codex, OpenCode from jamestexas/agents. It costs 2,391 tokens per session, scanned C, original, Apache-2.0.

A set of AGENTS.md instructions for the jamestexas/agents repository, which contains coding-agent projects.

In plain words
What is it for?
Use it when developing, testing, or installing agents from the jamestexas/agents repository.
Why use it?
It explains the repository structure, local testing workflow, agent development process, and how to copy an agent into a user directory for testing.

Instructions file for CodexOpenCode

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

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

Reuse

Borrowing it

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

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 agents AGENTS.md

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

Your own site · 80×15
<a href="https://agentmods.dev/instructions/jamestexas/agents/agents-md"><img src="https://agentmods.dev/badge/instructions/jamestexas/agents/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 2,391 This file is loaded in full into every session.
When invoked 2,391 The same file — it is already loaded in full.
Security scan C 1 finding. 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 $0.02391 $0.02391
Opus 5.5 $0.00956 $0.00956
Sonnet 5.5 $0.00478 $0.00478
Haiku 4.5 $0.00239 $0.00239

Measured 2mo ago against content hash 000898db6716, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

agents AGENTS.md scanned grade C with 1 finding 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

cp -f source dest mv -f source dest rm -f file rm -rf dir cp -rf src dst
AGENTS.md · 236 lines

How it starts

The opening of the file, as written. The whole thing — 236 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

This file provides guidance to Codex when working with code in this repository. It is the Codex-facing counterpart to CLAUDE.md; both describe the same repository, and a change to the conventions belongs in both.

Repository Overview

This is an agent definitions repository containing specialized agents. They are consumed by Claude Code and by Codex; the on-disk install target is ~/.claude/ for both, via scripts/install.sh. The repository contains no executable code - only agent definition files in Markdown format with YAML frontmatter.

Agent Development Workflow

Testing Agents Locally

# Copy agent to user directory for testing
cp agent-name.md ~/.claude/agents/

# Or copy to project directory
cp agent-name.md /path/to/project/.claude/agents/

Creating New Agents

  1. File Naming: Use kebab-case (e.g., code-performance-optimizer.md)

  2. Required Frontmatter Fields:

    • name: Must match filename without extension
    • description: Include XML-formatted usage examples
    • model: Usually inherit, use opus for complex reasoning
    • color: Choose from blue, green, purple, red, orange
  3. Agent Persona Guidelines:

    • Create compelling backstory that reinforces expertise
    • Define clear methodology and process
    • Structure output format for consistency
    • Include specific technical focus areas

Quality Standards

  • Description: Must include at least 2 detailed usage examples in XML format
  • Persona: Should establish credibility and unique perspective
  • Process: Define structured approach with numbered steps
  • Output: Specify format for agent responses

Repository Structure

/
├── *.md                    # Agent definition files
├── README.md              # Public documentation
├── AGENTS.md              # This file
└── .claude/              # agent + skill install target (see scripts/install.sh)
    └── settings.local.json # Local permissions

Git Workflow

When committing agent definitions:

  • Use semantic commit messages (feat: for new agents, fix: for corrections, docs: for documentation)
  • Test agents thoroughly before committing
  • Update README.md when adding new agents

Read the full file on GitHub · 236 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 · 236 lines · 2,391 tokens per session scan C 000898db6716

Subscribe to this mod's changes

agents AGENTS.md is an instructions file published in the GitHub repository jamestexas/agents (2 stars, last pushed today), licensed Apache-2.0. It adds 2,391 tokens to every session, about $0.0096 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

Other instructions, from other repositories

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 9,715 tokens

next.js AGENTS.md

AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.

vercel/next.js · 7,461 tokens

vscode oss-third-party-notices.instructions.md

Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).

microsoft/vscode · 5,262 tokens

langchain AGENTS.md

AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.

langchain-ai/langchain · 4,680 tokens

vscode copilot-instructions.md

Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).

microsoft/vscode · 2,750 tokens

deno copilot-instructions.md

Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.

denoland/deno · 3,077 tokens