athena-codex

athena-codex is a skill for Claude Code, Codex from taylorparsons/athena-skill. It costs 50 tokens per session (359 once invoked), scanned A, original, MIT.

A structured workflow for delivering software from a product requirements document, with linked records of changes, decisions, specifications, and tasks. It also defines Codex-specific session and documentation commands.

In plain words
What is it for?
Use it for iterative, one-task-at-a-time coding work that needs an audit trail from requirements through implementation.
Why use it?
It keeps implementation work traceable by requiring the request and decisions to be recorded before code changes begin.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/taylorparsons/athena-skill/codex
Any agent
npx skills add taylorparsons/athena-skill --skill codex
Clone the repo
git clone --depth 1 https://github.com/taylorparsons/athena-skill

Made for: Claude Code, Codex.

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 athena-codex

README.md
[![agentmods](https://agentmods.dev/badge/skills/taylorparsons/athena-skill/codex.svg)](https://agentmods.dev/skills/taylorparsons/athena-skill/codex)
Your own site
<a href="https://agentmods.dev/skills/taylorparsons/athena-skill/codex"><img src="https://agentmods.dev/badge/skills/taylorparsons/athena-skill/codex.svg" alt="Measured on agentmods" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 359 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00050 $0.00359
Opus 5 $0.00025 $0.00179
Sonnet 5 $0.00010 $0.00072
Haiku 4.5 $0.00005 $0.00036

Measured 5d ago against content hash c58119cb8d08, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

athena-codex 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 5d 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.

adapters/codex/SKILL.md · 29 lines

What it actually says

ATHENA Codex Adapter

The loop is identical on every harness — follow ../../skills/athena/SKILL.md. This adapter only covers Codex wiring.

Codex wiring

  • Session open: run ./scripts/owl context (Codex has no hooks or auto-memory — the script is the mechanism).

  • Keep ~/.codex/AGENTS.md minimal (trigger + stop-gates only, ≤ 15 lines). Do not duplicate loop steps there — the loop lives in SKILL.md. Recommended block:

    ## ATHENA — mandatory for all coding work
    - Invoke the athena skill before any change and follow its loop exactly.
    - Session open: ./scripts/owl context
    - Never Read docs/requests.md, docs/decisions.md, or docs/athena-index.md —
      use ./scripts/owl (add-request, add-decision, add-note, show, why).
    - No code changes until the current request is captured (owl add-request)
      and reflected in docs/PRD.md.
    - If any gate above was skipped, STOP and restart with ATHENA.
    
  • Install the full package with $skill-installer into $CODEX_HOME/skills/athena, then run scripts from $CODEX_HOME/skills/athena/scripts/ (or a local ./scripts/owl wrapper).

Versioning

Use Semantic Versioning from ../../VERSION. Breaking process changes require a major bump.

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. 5d ago First seen · 29 lines · 50 tokens per session scan A c58119cb8d08

Subscribe to this mod's changes

athena-codex is a skill published in the GitHub repository taylorparsons/athena-skill (2 stars, last pushed 1mo ago), licensed MIT. It adds 50 tokens to every session and 359 once invoked, about $0.0003 per session on Opus 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.