Borrowing it
Nothing to install: this file belongs to friuns2/codex-mobile. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/friuns2/codex-mobile/main/.agents/skills/codex-app-parity/SKILL.mdgit clone --depth 1 https://github.com/friuns2/codex-mobileWrote 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.
[](https://agentmods.dev/skills/friuns2/codex-mobile/codex-app-parity)<a href="https://agentmods.dev/skills/friuns2/codex-mobile/codex-app-parity"><img src="https://agentmods.dev/badge/skills/friuns2/codex-mobile/codex-app-parity/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.
<a href="https://agentmods.dev/skills/friuns2/codex-mobile/codex-app-parity"><img src="https://agentmods.dev/badge/skills/friuns2/codex-mobile/codex-app-parity.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00040 | $0.12722 |
| Opus 5.5 | $0.00016 | $0.05089 |
| Sonnet 5.5 | $0.00008 | $0.02544 |
| Haiku 4.5 | $0.00004 | $0.01272 |
Grade A, and why
codex-app-parity scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
if curl -fsS "http://127.0.0.1:$port/json/list" >/tmp/codex-cdp-list.json 2>/dev/null; then How it starts
The opening of the file, as written. The whole thing — 811 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex App Parity Skill
Use this skill only when the user explicitly asks for Codex parity work, names codex-app-parity, mentions Codex.app parity, or asks to compare behavior against the installed Codex desktop app.
Do not auto-trigger this skill for ordinary feature work, UI changes, or user-visible behavior changes unless the user explicitly requests that parity workflow.
Objective
Ensure behavior is implemented with Codex.app as the source of truth, then verified with headless Playwright and screenshots.
Project Instructions
Repo Knowledge Maintenance
For user-visible Directory, Skills, Apps, Plugins, MCP, or Composio changes in this repo:
- Update the relevant manual test doc under
tests/<domain>/...with verification steps, including light and dark theme checks. Updatetests.mdonly when adding, renaming, or removing a domain folder. - If the change creates or changes durable behavior/architecture, add or update an
llm-wiki/raw/...source and correspondingllm-wiki/wiki/...concept page. - Keep
whatToTest.mdas a short pending-only checklist; remove items that were actually executed successfully. - Prefer assertions plus screenshots for browser validation; screenshots alone are not enough.
Codex.app-First Development Policy
For every new feature and every behavior/UI change, treat the installed desktop app as the source of truth:
- App path:
/Applications/Codex.app - Primary bundle to inspect:
/Applications/Codex.app/Contents/Resources/app.asar
Do not implement first and compare later. Compare first, then implement.
How to Search for Features in Codex.app
Extraction
Extract the app bundle once (reuse if already extracted):
mkdir -p /tmp/codex-app-extracted
npx asar extract "/Applications/Codex.app/Contents/Resources/app.asar" /tmp/codex-app-extracted
Key Directories
| Directory | Contents |
|---|---|
/tmp/codex-app-extracted/webview/assets/ |
Main frontend bundle (index-*.js) + locale files |
/tmp/codex-app-extracted/.vite/build/ |
Electron main process (main.js, main-*.js, preload.js, worker.js) |
/tmp/codex-app-extracted/package.json |
App metadata, version, entry point |
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago Changed · +22 lines c8535ba504e5
- 2mo ago First seen · 789 lines · 40 tokens per session scan A b21858531417
codex-app-parity is a skill published in the GitHub repository friuns2/codex-mobile (978 stars, last pushed 1mo ago), licensed MIT. It adds 40 tokens to every session and 12,722 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
develop-web-game
Use when Codex is building or iterating on a web game (HTML/JS) and needs a reliable development + testing loop: implement small changes, run a Playwright-based test script with short input bursts and intentional pauses, inspect screenshots/text, and review console errors with rendergametotext.
langbot-testing
Test LangBot WebUI and core product flows with an automated browser and backend logs. Use when validating the configured LangBot frontend, pipeline Debug Chat, model provider setup and test buttons, bot and knowledge-base UI flows, or troubleshooting failed LangBot end-to-end tests.
startup-qa-bot-getting-started
A guided first conversation for a product-checking assistant. It helps define a safe test environment and choose an initial check, such as following a sign-up flow or comparing two versions.
startup-qa-bot-ops
A working procedure for checking a product in a clearly separated test environment. It maintains a page map, records observations, compares known page lists, and reports reproducible problems.
proto-bot-evidence
A small local checker that compares acceptance requirements with evidence for required interface themes or modes. It checks supplied data but does not render pages or prove that a person inspected them in a browser or on a device.
mailagent
Temporary inboxes for agent signup QA — create disposable addresses, wait for verification email, extract OTP or magic links. Use when automating signup, login, or email verification without parsing HTML manually.