Borrowing it
Nothing to install: this file belongs to Chachamaru127/codex-harness. 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/Chachamaru127/codex-harness/main/.codex/skills/_archived/codex-setup/SKILL.mdgit clone --depth 1 https://github.com/Chachamaru127/codex-harnessWrote 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/chachamaru127/codex-harness/codex-setup)<a href="https://agentmods.dev/skills/chachamaru127/codex-harness/codex-setup"><img src="https://agentmods.dev/badge/skills/chachamaru127/codex-harness/codex-setup/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/chachamaru127/codex-harness/codex-setup"><img src="https://agentmods.dev/badge/skills/chachamaru127/codex-harness/codex-setup.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 | $0.00071 | $0.00586 |
| Opus 5.5 | $0.00028 | $0.00234 |
| Sonnet 5.5 | $0.00014 | $0.00117 |
| Haiku 4.5 | $0.00007 | $0.00059 |
Grade B, and why
codex-setup scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
ls -la .codex/skills What it actually says
Codex Setup Skill
Set up Codex CLI compatibility for the current project.
Deliverables
.codex/skills/- Harness skills for Codex.codex/rules/- Temporary guardrailsAGENTS.md- Codex rules file- Optional:
.codex/config.toml(MCP template)
Usage
/codex-setup
/codex-setup --with-mcp
/codex-setup --skip-mcp
Execution Flow
- Confirm user wants Codex CLI setup/update
- Ask whether to copy MCP template (
--with-mcp) - Run setup script
- Verify files exist
- Report completion + next steps
Script Execution
Prefer running from plugin root:
bash "${CLAUDE_PLUGIN_ROOT}/scripts/codex-setup-local.sh" --skip-mcp
If CLAUDE_PLUGIN_ROOT is unavailable, run from plugin repo root:
bash ./scripts/codex-setup-local.sh --skip-mcp
Verification
ls -la .codex/skills
ls -la .codex/rules
ls -la AGENTS.md
Completion Message
Codex CLI setup complete.
.codex/skills//.codex/rules/installedAGENTS.mdupdated (backup created if existed)- Use
$plan-with-agent,$work,$harness-reviewin Codex
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 First seen · 67 lines · 71 tokens per session scan B d8d5ab92dc7d
codex-setup is a skill published in the GitHub repository Chachamaru127/codex-harness (2 stars, last pushed 8mo ago), licensed MIT. It adds 71 tokens to every session and 586 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other skills, from other repositories
local-ai-agents
Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…
systematic-debugging
Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.
next-cache-components-adoption
Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…
chat-pet-sprite-creation
Use when creating or changing VS Code chat pet sprite art, sprite sheets, state animations, eye treatments, Stable/Insiders variants, or pet transitions under src/vs/workbench/contrib/chat/browser/widget/media/chatPet.
cpu-profile-analysis
Analyze V8/Chrome CPU profiles (.cpuprofile) and DevTools trace files (Trace-.json). Use when: profiling performance, investigating slow functions, comparing code paths, finding bottlenecks, analyzing timeToRequest, understanding call trees from sampling profiler data, analyzing layout/paint/rendering, investigating…
insight-error-page
Write or audit an insight-kind error page for the Next.js dev overlay. Use when creating a new errors/ .mdx page, auditing an existing one, or checking that a page matches the framework fix cards. Covers page structure, title alignment, FixCard cards with Copy prompt button, code snippets, terminology verification…