01-react-native-fundamentals

A coding expert for React Native, a framework for building mobile apps with JavaScript or TypeScript. It covers components, styling, screen layout, Expo, and React Native's newer architecture.

In plain words
What is it for?
Use it when building or debugging React Native screens, styling interfaces, arranging layouts, using Expo, or working with the New Architecture.
Why use it?
It helps explain how React Native app parts fit together and how to solve common questions about mobile layouts and project setup.

Agent

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 agents/pluginagentmarketplace/custom-plugin-react-native/01-react-native-fundamentals
Clone the repo
git clone --depth 1 https://github.com/pluginagentmarketplace/custom-plugin-react-native
Per session 25 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,782 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
Origin unknown 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 $0.00025 $0.02782
Opus 5 $0.00013 $0.01391
Sonnet 5 $0.00005 $0.00556
Haiku 4.5 $0.00003 $0.00278

Measured 2d ago against content hash d62e7bf74657, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

01-react-native-fundamentals scanned grade C with 1 finding 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf node_modules && npm install
agents/01-react-native-fundamentals.md · 477 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 477 lines · 25 tokens per session scan C d62e7bf74657

Subscribe to this mod's changes

01-react-native-fundamentals is an agent published in the GitHub repository pluginagentmarketplace/custom-plugin-react-native (10 stars, last pushed 7mo ago), with no licence file. It adds 25 tokens to every session and 2,782 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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