codex-bridge

A helper that sends bounded coding tasks to OpenAI Codex and can ask it for an independent code review or second opinion.

In plain words
What is it for?
Implementing or scaffolding small code changes, adding tests, refactoring, migrating code, reviewing changes, and discussing technical decisions.
Why use it?
It gives you another coding agent to handle clearly defined implementation work or challenge your approach before you rely on it.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/arystos/skill-codex/codex-bridge
Any agent
npx skills add Arystos/skill-codex --skill codex-bridge
Clone the repo
git clone --depth 1 https://github.com/Arystos/skill-codex

Made for: Claude Code, Codex.

Per session 176 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,051 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00176 $0.03051
Opus 5 $0.00088 $0.01525
Sonnet 5 $0.00035 $0.00610
Haiku 4.5 $0.00018 $0.00305

Measured 2d ago against content hash 54e085e29446, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

codex-bridge 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 2d 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.

skills/codex-bridge/SKILL.md · 218 lines

How it starts

The opening of the file, as written. The whole thing — 218 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Codex Bridge

This skill turns OpenAI Codex into a peer engineer you can delegate bounded implementation work to, and a second reviewer you can call for independent code review or technical consultation. It uses the codex_exec MCP tool provided by the skill-codex MCP server.

When to use this skill

Load this skill automatically when the user's request matches any of the following patterns:

Delegation triggers (use delegate workflow below):

  • "implement X" / "write a function that X" / "create a script that X"
  • "generate tests for X" / "add unit tests" / "scaffold tests"
  • "port X to Y" / "convert X to Y" / "rewrite X in Y"
  • "refactor this file" (single-file, clear target)
  • "write a migration" / "create boilerplate for X"
  • Any bounded, single-file or small multi-file code task with a clear spec

Review triggers (use review workflow below):

  • "review my changes" / "review this diff" / "code review"
  • "second opinion on this code" / "independent review"
  • "check this for bugs" / "audit this for security issues"
  • Before committing critical code (auth, payments, crypto, concurrency)

Consult triggers (use consult workflow below):

  • "what do you think about this approach"
  • "is this the right way to do X"
  • "second opinion on my plan"
  • Debugging when Claude has failed 3+ times on the same issue

When NOT to use this skill

Skip Codex and do the work yourself when:

  • Task is <50 lines and faster to do directly
  • Task requires deep conversation context Codex won't have
  • Cross-module architectural refactor
  • Ambiguous requirements needing user clarification
  • Planning, brainstorming, or design decisions (Claude handles these)
  • User explicitly asks you to do the work yourself

Workflows

Workflow 1: Delegate implementation (delegate)

Use when the user asks for a bounded implementation task with a clear spec.

Steps:

  1. Verify the task is well-scoped. If the request is vague, ask one clarifying question before delegating. A good delegation prompt has: exact file paths, specific change required, constraints (language, style, naming), and a clear "done" condition.

Read the full file on GitHub · 218 lines

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.

  1. 2d ago First seen · 218 lines · 176 tokens per session scan A 54e085e29446

Subscribe to this mod's changes

codex-bridge is a skill published in the GitHub repository Arystos/skill-codex (5 stars, last pushed 1mo ago), licensed MIT. It adds 176 tokens to every session and 3,051 once invoked, about $0.0009 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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