Borrowing it
Nothing to install: this file belongs to nick-pape/grackle. 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/nick-pape/grackle/main/.claude/skills/test-codex-runtime/SKILL.mdgit clone --depth 1 https://github.com/nick-pape/grackleWrote 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/nick-pape/grackle/test-codex-runtime)<a href="https://agentmods.dev/skills/nick-pape/grackle/test-codex-runtime"><img src="https://agentmods.dev/badge/skills/nick-pape/grackle/test-codex-runtime/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/nick-pape/grackle/test-codex-runtime"><img src="https://agentmods.dev/badge/skills/nick-pape/grackle/test-codex-runtime.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 | $0.00058 | $0.00791 |
| Opus 5.5 | $0.00023 | $0.00316 |
| Sonnet 5.5 | $0.00012 | $0.00158 |
| Haiku 4.5 | $0.00006 | $0.00079 |
Grade A, and why
test-codex-runtime 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 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.
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 — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Test the Codex runtime
How to spawn the codex runtime against an isolated test server. Assumes a server from /launch-grackle (with GRACKLE_URL + GRACKLE_API_KEY exported).
Allowed model names ✅ / ❌ (ChatGPT-account auth)
| Model | Works? | Notes |
|---|---|---|
gpt-5.5 |
✅ confirmed live | Needs Codex SDK >= 0.135.0 (the catalog pin). On the old 0.111.0 it errored "requires a newer version of Codex." |
o3, o3-mini, gpt-5-codex, gpt-5, gpt-5.1, gpt-5-mini |
❌ | "not supported when using Codex with a ChatGPT account" — these are account-gated (likely need OpenAI API-key auth or a higher tier), independent of SDK version |
The catalog (
packages/common/src/runtime-catalog.ts) advertisesgpt-5.5and pins@openai/codex-sdk ^0.135.0. Ifgrackle runtimesstill showso3, the catalog hasn't been rebuilt/installed.
History: the SDK was bumped ^0.111.0 → ^0.135.0 precisely to unlock gpt-5.5 (validated 2026-05-29). The runtime installer (runtime-installer.ts) auto-reinstalls when the catalog spec changes (it compares the persisted package spec), so the global ~/.grackle/runtimes/codex/ upgrades on the next codex spawn.
Spawn it
grackle persona create "Codex Tester" --runtime codex --model gpt-5.5 --prompt "You are a test agent."
grackle spawn local "Run exactly this one shell command and nothing else, then stop: cat /nonexistent_file_xyz" --persona codex-tester
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 · 45 lines · 58 tokens per session scan A 8ff22df44282
test-codex-runtime is a skill published in the GitHub repository nick-pape/grackle (22 stars, last pushed 4mo ago), licensed MIT. It adds 58 tokens to every session and 791 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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