react-native-harness — Agent skill by callstackincubator

A signpost rather than a manual: it checks that your copy of React Native Harness, the on-device test runner, is recent enough, then loads the testing guide that belongs to that exact version so you never follow instructions written for a different one.

WHEN TO USE

SCOPE

USE FOR

Make sure your Harness CLI is new enough before you start writing tests.
Get pointed to the correct core testing guide for the Harness CLI version you have installed.
Find out what other Harness CLI guides are available for more advanced testing features.

NOT FOR

Don't expect test-writing steps or API details here — those live in the loaded CLI guide.
Don't put version-check or upgrade commands into your final test plan.

This is a saved copy of the skill's SKILL.md instructions. It may differ from the upstream file or the version you install.

Router only. Private setup before using this skill:

harness --version

Require react-native-harness >= 1.3.0-rc.1; older CLIs lack these skill commands. If older, run npm install -g react-native-harness@latest, recheck, then continue. If you cannot upgrade, stop and tell the user. Do not include version or upgrade commands in final plans.

Before your first Harness command or plan, read the version-matched CLI guide:

harness skill get core

If you need more details on Harness, see the available CLI skill guides:

harness skill list

Load additional skills via harness skill get <name> when needed.

Use this skill only to route into version-matched CLI guidance. Let the installed CLI skill files provide exact workflow guidance, API usage, and current test-writing rules.

Local tool required

2 FOR THE AGENT

All items below are required.

01
Update to react-native-harness 1.3.0-rc.1 or newer
Run harness --version. If it's older than react-native-harness 1.3.0-rc.1, run npm install -g react-native-harness@latest, recheck, and if you still can't upgrade, stop and tell the user instead of continuing.
```
harness --version
```
```
npm install -g react-native-harness@latest
```
02
Load the version-matched core Harness guide first
Before your first Harness command or plan, run harness skill get core to load the CLI guide that matches your installed react-native-harness version. Load further guides with harness skill get <name> as needed.
```
harness skill get core
```

Listed as free: Connected services may require an account or charge fees.
Installation: One command — usually under 2 minutes.

Not standalone. This skill ships with callstackincubator/react-native-harness and only works together with that tool — install the tool first, then add this skill.

Run this outside your AI tool, using Node.js 22.20.0 or newer. Skills CLI 1.7.2 skips skill selection; prompts cancel installation without an interactive terminal. If choosing Project when asked about installation scope, open your project's folder before running this.

Install checklist

Check selected tools if a picker appears; Claude Code may be unchecked under Additional agents. ↑/↓ moves, Space toggles selections, Enter confirms.
Without a tool picker, check Installing to: for your intended tool. Stop if it names a different tool.
If asked, choose Symlink (Recommended) for shared files or Copy to all agents for separate copies; review the summary before confirming installation.
Install the find-skills skill? defaults to Yes, adding another skill for all projects. Choose No if you don't want that extra installation.

Skills CLI 1.7.2 sends install data to skills.sh by default, including the source, skill names, target tools and file details; GitHub sources are reported only when GitHub confirms the repository is public, while other remote sources can also be reported. Confirmed-public GitHub sources also trigger a security-audit request. Before installing, set the environment variable DO_NOT_TRACK=1 or DISABLE_TELEMETRY=1 to disable both.

npx skills add callstackincubator/react-native-harness --skill "react-native-harness" --full-depth

After installing for Claude Code, open it in the installation project if you chose Project; Global makes the skill available across projects on this computer. Once Claude Code loads the skill, its description helps Claude decide when to use it.

If installation created a top-level skills folder that did not exist when your Claude Code session started, run /reload-skills in that session. Run it again after later changes in that folder.

What's inside

Files included with this skill.

View on GitHub