oh-my-codex is a workflow layer for OpenAI Codex CLI that adds prompts, agent teams, skills, hooks, HUDs, and other runtime assistance while leaving Codex as the execution engine. It is for people who use Codex CLI and want structured workflows and additional help as tasks become larger. The catalogue entries are its skills, hooks, and MCP integrations for those Codex workflows.
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 skills add Yeachan-Heo/oh-my-codex --skill cancelgit clone --depth 1 https://github.com/Yeachan-Heo/oh-my-codexWrote 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/yeachan-heo/oh-my-codex/cancel)<a href="https://agentmods.dev/skills/yeachan-heo/oh-my-codex/cancel"><img src="https://agentmods.dev/badge/skills/yeachan-heo/oh-my-codex/cancel/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/yeachan-heo/oh-my-codex/cancel"><img src="https://agentmods.dev/badge/skills/yeachan-heo/oh-my-codex/cancel.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00035 | $0.00541 |
| Opus 5 | $0.00017 | $0.00270 |
| Sonnet 5 | $0.00007 | $0.00108 |
| Haiku 4.5 | $0.00003 | $0.00054 |
Grade A, and why
cancel 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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 41 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cancel Skill
When to use
Use /cancel (or cancelomc / stopomc) to stop an active OMX mode and perform its documented cleanup. Read AGENTS.md#durable-runtime-invariants-canonical-ssot first; it is the invariant authority for scope, ownership, hooks, and Team cleanup.
Inputs and preconditions
- Accepted forms are
/canceland/cancel --force. - Reject
--all, unknown flags, repeated flags, and mixed flags before mutation. - Discover the current session/root with the state read surfaces before cleanup:
omx state list-active --json omx state get-status --mode <mode> --json - Confirm the current session/root and exact target before cleanup; stop when the required evidence is missing.
Operational steps
- Parse and validate arguments; select one exact session/root scope.
- Inspect active modes in dependency order:
autopilot → ralph → ultrawork → ecomode → ultraqa → swarm → ultrapilot → pipeline → team → plan-consensus. - Cancel Autopilot while preserving its resumable state; clean only linked child modes it owns.
- For Ralph, terminalize the target state (
active:false,current_phase:"cancelled",completed_at) and terminalize a proven linked Ultrawork/Ecomode state in the same scope. Confirm the post-conditions indocs/contracts/ralph-cancel-contract.md. - Clear standalone modes only after proving they are not linked to another active mode.
- For Team, inspect the runtime with
omx team status <team> --json; useomx team shutdown <team>after the normal completion gate, or follow the explicit abort path. - Clear only the selected mode/session state through the state API, for example:
omx state clear --input '{"mode":"<mode>","session_id":"<session>"}' --json - With
--force, perform its documented native-stop cleanup. Report rollback or cleanup failures rather than claiming success.
Exit and evidence
Report one result per selected mode: mode, scope/session, terminal phase, preserved state, linked cleanup, and any refusal reason. A clean no-op reports No active OMX modes detected. Include Team status and shutdown evidence when Team was selected.
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.
- 11d ago First seen · 41 lines · 35 tokens per session scan A 661a728669c3
cancel is a skill published in the GitHub repository Yeachan-Heo/oh-my-codex (33,078 stars, last pushed today), licensed MIT. It adds 35 tokens to every session and 541 once invoked, about $0.0002 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 2026-08-30.
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