setup

A project-onboarding workflow for Codex, a coding agent. It sets up diagnostics, project instructions, and optional navigation, store, and React Native support.

In plain words
What is it for?
Use it when starting work on a Codex project to configure passive diagnostics, AGENTS.md guidance, optional app instrumentation, and the React Native agent scaffold.
Why use it?
It gives the agent a consistent understanding of a new project and can add checks or instrumentation needed during development.

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/lykhoyda/rn-dev-agent/setup
Any agent
npx skills add Lykhoyda/rn-dev-agent --skill setup
Clone the repo
git clone --depth 1 https://github.com/Lykhoyda/rn-dev-agent

Made for: Claude Code, Codex.

Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 239 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 75% 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.

ModelPer sessionOnce invoked
Fable 5 $0.00034 $0.00239
Opus 5 $0.00017 $0.00120
Sonnet 5 $0.00007 $0.00048
Haiku 4.5 $0.00003 $0.00024

Measured 2d ago against content hash 8b6ebf3beaab, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

setup 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.

Origin

This is a copy

75% identical to build-and-test — 10 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.

packages/codex-plugin/skills/setup/SKILL.md · 14 lines

What it actually says

setup

Invoke this workflow explicitly as $rn-dev-agent:setup [request text].

The exact text after the skill mention is the conceptual request. It is user-message data, not a shell variable or a Claude command-template substitution. Preserve it while applying the workflow's documented grammar; pass only separately parsed and validated values to MCP tools or package helpers. Never use eval or interpolate the raw request into a shell command.

Read the complete package-local workflow before acting. Resolve that file and every helper relative to this exact SKILL.md path; never scan Codex caches or rely on a plugin-root environment variable. If a required cdp MCP tool is absent from the active task, stop and use the read-only discovery diagnosis. Do not substitute raw Maestro for rn-dev-agent strict proof.

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 14 lines · 34 tokens per session scan A 8b6ebf3beaab

Subscribe to this mod's changes

setup is a skill published in the GitHub repository Lykhoyda/rn-dev-agent (11 stars, last pushed 2d ago), licensed MIT. It adds 34 tokens to every session and 239 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 75% identical to build-and-test, differing in 10 lines, and is treated as a copy.

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