A setup for using Codex as the agent provider in NanoClaw, replacing the Claude Agent SDK as the system that plans work and calls tools.

Use it to add the Codex provider, install its command-line component, configure it per group, and run it through the Codex app server.

It lets the project use Codex while retaining session resume, streamed events, MCP tool access, and conversation compaction, reducing dependence on one provider.

How thmtz/nanoclaw-fleet configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to thmtz/nanoclaw-fleet. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/thmtz/nanoclaw-fleet/main/.claude/skills/add-codex/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/thmtz/nanoclaw-fleet

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/thmtz/nanoclaw-fleet/add-codex.svg)](https://agentmods.dev/skills/thmtz/nanoclaw-fleet/add-codex)

Your own site

<a href="https://agentmods.dev/skills/thmtz/nanoclaw-fleet/add-codex"><img src="https://agentmods.dev/badge/skills/thmtz/nanoclaw-fleet/add-codex.svg" alt="Measured on agentmods" height="20"></a>

Per session 76 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,040 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin 89% copy Near-identical to another mod 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.

Model	Per session	Once invoked
Fable 5.1	$0.00076	$0.02040
Opus 5	$0.00038	$0.01020
Sonnet 5	$0.00015	$0.00408
Haiku 4.5	$0.00008	$0.00204

Measured 6d ago against content hash 3d31998b94b6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

add-codex 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 6d 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.

Origin

This is a copy

89% identical to add-codex — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/skills/add-codex/SKILL.md · 162 lines

How it starts

The opening of the file, as written. The whole thing — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Codex agent provider

NanoClaw runs agents in a long-lived poll loop inside the container. The backend is selected with AGENT_PROVIDER (claude | opencode | codex | mock).

Trunk ships with only the claude provider baked in. This skill copies the Codex provider files in from the providers branch, wires them into the host and container barrels, updates the Dockerfile to install the Codex CLI, and rebuilds the image.

The Codex provider runs codex app-server as a child process and speaks JSON-RPC over stdio. That gives it native session resume, streaming events, MCP tool access, and thread/compact/start compaction — same feature bar as the Claude Agent SDK, without the Anthropic-only lock-in.

Install

Pre-flight

If all of the following are already present, skip to Configuration:

src/providers/codex.ts
container/agent-runner/src/providers/codex.ts
container/agent-runner/src/providers/codex-app-server.ts
container/agent-runner/src/providers/codex.factory.test.ts
import './codex.js'; line in src/providers/index.ts
import './codex.js'; line in container/agent-runner/src/providers/index.ts
ARG CODEX_VERSION and "@openai/codex@${CODEX_VERSION}" in the pnpm global-install block in container/Dockerfile

Missing pieces — continue below. All steps are idempotent; re-running is safe.

1. Fetch the providers branch

git fetch origin providers

2. Copy the Codex source files

Wholesale copies (owned entirely by this skill — user edits to these files won't survive a re-run, as designed):

git show origin/providers:src/providers/codex.ts                                      > src/providers/codex.ts
git show origin/providers:container/agent-runner/src/providers/codex.ts               > container/agent-runner/src/providers/codex.ts
git show origin/providers:container/agent-runner/src/providers/codex-app-server.ts    > container/agent-runner/src/providers/codex-app-server.ts
git show origin/providers:container/agent-runner/src/providers/codex.factory.test.ts  > container/agent-runner/src/providers/codex.factory.test.ts

Read the full file on GitHub · 162 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.

6d ago First seen · 162 lines · 76 tokens per session scan A 3d31998b94b6

Subscribe to this mod's changes

add-codex is a skill published in the GitHub repository thmtz/nanoclaw-fleet (5 stars, last pushed 4mo ago), licensed MIT. It adds 76 tokens to every session and 2,040 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 89% identical to add-codex, differing in 2 lines, and is treated as a copy.

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nanoclaw-fleet: Skill for Claude Code