Borrowing it
Nothing to install: this file belongs to sorryorc/mcp-codex-worker. 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/sorryorc/mcp-codex-worker/main/.claude/skills/worker-architecture-contract/SKILL.mdgit clone --depth 1 https://github.com/sorryorc/mcp-codex-workerWrote 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/sorryorc/mcp-codex-worker/worker-architecture-contract)<a href="https://agentmods.dev/skills/sorryorc/mcp-codex-worker/worker-architecture-contract"><img src="https://agentmods.dev/badge/skills/sorryorc/mcp-codex-worker/worker-architecture-contract/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/sorryorc/mcp-codex-worker/worker-architecture-contract"><img src="https://agentmods.dev/badge/skills/sorryorc/mcp-codex-worker/worker-architecture-contract.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 | $0.00032 | $0.00276 |
| Opus 5.5 | $0.00013 | $0.00110 |
| Sonnet 5.5 | $0.00006 | $0.00055 |
| Haiku 4.5 | $0.00003 | $0.00028 |
Grade A, and why
worker-architecture-contract 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 2mo 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.
What it actually says
Worker Architecture Contract
Load-Bearing Boundaries
- Main Codex plans, decides, and performs final review.
- Worker tools absorb bulk reading, shell output, diff digestion, and implementation loops.
- Lite tools are read-only cheap gateway calls. They are not authoritative for high-risk acceptance.
- Receipts and artifacts are the evidence boundary. Model prose is not proof.
- Deterministic gates can reject scope, failed checks, and malformed output without extra LLM calls.
Invariants
- All paths stay inside
SANDBOX_ROOT. bypassPermissionsis rejected unless explicitly allowed.- Large outputs should be artifact-backed.
- New strictness must be advisory unless
blocking_policy=enforce.
When Not To Use
Do not use this for single failing command diagnosis. Use worker-debugging-playbook.
Verification
npm testrg -n "SANDBOX_ROOT|bypassPermissions|artifact_refs|blocking_policy" src
Provenance and maintenance
Re-read src/server.ts, src/security.ts, src/artifacts.ts, and src/reliability.ts after contract changes.
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.
- 2mo ago First seen · 35 lines · 32 tokens per session scan A 5ec72c317faa
worker-architecture-contract is a skill published in the GitHub repository sorryorc/mcp-codex-worker (2 stars, last pushed 1mo ago), licensed MIT. It adds 32 tokens to every session and 276 once invoked, about $0.0001 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 2026-08-31.
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