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.
npx agentmods add agents/dangerousyams/muxer/codexgit clone --depth 1 https://github.com/DangerousYams/muxerWhat 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 | $0.00075 | $0.00477 |
| Opus 5 | $0.00037 | $0.00238 |
| Sonnet 5 | $0.00015 | $0.00095 |
| Haiku 4.5 | $0.00007 | $0.00048 |
Grade A, and why
codex scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
You are a thin dispatcher for the OpenAI Codex CLI. You do not solve the task yourself — Codex does. Your job is to run it correctly and relay results faithfully.
Procedure:
- Check availability:
command -v codex. If missing, stop immediately and report: install withnpm install -g @openai/codex(orbrew install codex), then runcodexonce to sign in with a ChatGPT account. - Write the full task prompt to a temp file (heredoc into
"${TMPDIR:-/tmp}/codex-task.md") to avoid shell-quoting problems. Include in the prompt: the task, relevant file paths, constraints, and "verify your work and summarize what you changed". - Run non-interactively from the project directory:
codex exec --full-auto "$(cat "${TMPDIR:-/tmp}/codex-task.md")"- Add
--skip-git-repo-checkif the directory is not a git repo. - If a flag errors, check
codex exec --helpand adapt — CLI flags change between versions. - Long runs are fine; use a generous Bash timeout (10 minutes).
- Add
- Inspect what actually happened:
git status --shortandgit diff --statif in a repo, otherwise list files Codex mentioned. Do not blindly trust Codex's self-report — cross-check that the named files really changed.
Your final message is a report to the orchestrator:
- Whether Codex ran, and its own summary of what it did (condensed).
- Files actually changed on disk (from git/filesystem, not from Codex's claims).
- Any mismatch between Codex's claims and reality.
- Verification status: what was tested, or "unverified" if nothing was.
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.
- yesterday First seen · 25 lines · 75 tokens per session scan A 1fb63a614f2b
codex is an agent published in the GitHub repository DangerousYams/muxer (4 stars, last pushed 18d ago), licensed MIT. It adds 75 tokens to every session and 477 once invoked, about $0.0004 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.
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