Borrowing it
Nothing to install: this file belongs to littlebearapps/untether. 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/littlebearapps/untether/master/.claude/skills/codex-opencode-pi/SKILL.mdgit clone --depth 1 https://github.com/littlebearapps/untetherWrote 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/littlebearapps/untether/codex-opencode-pi)<a href="https://agentmods.dev/skills/littlebearapps/untether/codex-opencode-pi"><img src="https://agentmods.dev/badge/skills/littlebearapps/untether/codex-opencode-pi/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/littlebearapps/untether/codex-opencode-pi"><img src="https://agentmods.dev/badge/skills/littlebearapps/untether/codex-opencode-pi.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Excessive Agency · line 48 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
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 | $0.00053 | $0.02908 |
| Opus 5.5 | $0.00021 | $0.01163 |
| Sonnet 5.5 | $0.00011 | $0.00582 |
| Haiku 4.5 | $0.00005 | $0.00291 |
Grade A, and why
codex-opencode-pi 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 18d 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 — 255 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex, OpenCode, and Pi Runner Protocols
These three engines are non-interactive only — no control channel, no permission prompts. They extend JsonlSubprocessRunner and use its run_impl (ClaudeRunner replaces it; OpenCodeRunner only wraps it with a pre-spawn version check, #970).
A failed resumed run keeps the chat's saved session unless the error names the resume itself (_RESUME_FAILURE_RE in runner_bridge.py: Codex no rollout found, OpenCode Session not found, Pi No session found, …) — none of the three reports num_turns, so the Claude-style 0-turn rule can't apply (#952). A new "session not found" wording must be added there.
Quick comparison
| Aspect | Codex | OpenCode | Pi |
|---|---|---|---|
| CLI | codex exec --json |
opencode run --format json |
pi --print --mode json |
| Event model | Turn-based (items in turns) | Step-based (tools in steps) | Agent-based (messages + tools) |
| Resume line | `codex resume <thread_id>` |
`opencode --session ses_XXX` |
`pi --session <token>` |
| Resume token | thread_id (UUID) | ses_XXXX (26+ chars) | UUID short (8 chars) or path |
| Final answer | agent_message item |
Accumulated text events |
message_end assistant content |
| Error signal | turn.failed |
error event / missing step_finish |
stopReason in message_end |
Codex
Key files
| File | Purpose |
|---|---|
src/untether/runners/codex.py |
CodexRunner implementation |
src/untether/schemas/codex.py |
msgspec structs for Codex events |
docs/reference/runners/codex/exec-json-cheatsheet.md |
JSONL event shapes |
docs/reference/runners/codex/untether-events.md |
Event mapping spec |
CLI invocation
codex [extra_args…] [--profile P] [--model MODEL] [-c model_reasoning_effort=LEVEL] \
exec --json --skip-git-repo-check --color=never \
[--sandbox read-only] [resume <thread_id> | resume --last] -
- Prompt on stdin (trailing
-means read stdin) - Resume:
resume <thread_id> -(resume --last -for/continue) - Safe mode is genuinely read-only:
--sandbox read-only(exec-level, so it outranks a root-level sandbox flag), only insafepermission mode and beforeresume(codex exec resumehas no--sandbox); no--ask-for-approval—codex execforces approvalneveritself (#830) extra_argssit at the root (beforeexec) and are checked byrunners/extra_args_guard.py: bypass/sandbox-escape flags (--yolo,--sandbox danger-full-access,-c …danger…,-C/--cd, …) disable the engine at load (#209)--skip-git-repo-check --color=neverfor clean output
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.
- 18d ago Changed · +15 lines 59ed89bba25a
- 1mo ago First seen · 240 lines · 53 tokens per session scan A a278a8b17922
codex-opencode-pi is a skill published in the GitHub repository littlebearapps/untether (74 stars, last pushed today), licensed MIT. It adds 53 tokens to every session and 2,908 once invoked, about $0.0002 per session on Opus 5.5. 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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