everything-react-native-expo: Skill for Claude Code

.claude/skills/erne-code/SKILL.md

erne-code is a skill for Claude Code from JubaKitiashvili/everything-react-native-expo. It costs 14 tokens per session (334 once invoked), scanned A, original, MIT.

A feature-implementation workflow for building complete React Native app features with a senior-developer agent.

In plain words
What is it for?
It is for implementing features that may span API clients, queries, state stores, screens, navigation, loading and error states, offline behavior, and deep links.
Why use it?
It provides a defined path from an existing plan to working code, including data handling, screens, navigation, edge cases, and a self-review.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is JubaKitiashvili/everything-react-native-expo's own configuration. It tells Claude Code how to work on everything-react-native-expo itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything everything-react-native-expo configures →

Part of the erne-universal plugin — 45 skills, 12 agents shipped together

Reuse

Borrowing it

Nothing to install: this file belongs to JubaKitiashvili/everything-react-native-expo. 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/JubaKitiashvili/everything-react-native-expo/main/.claude/skills/erne-code/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/JubaKitiashvili/everything-react-native-expo

Made for: Claude Code.

Or install erne-universal, the plugin that ships this one along with the rest of its 45 skills, 12 agents.

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.

agentmods badge for erne-code

README.md
[![agentmods](https://agentmods.dev/badge/skills/jubakitiashvili/everything-react-native-expo/erne-code.svg)](https://agentmods.dev/skills/jubakitiashvili/everything-react-native-expo/erne-code)
Your own site
<a href="https://agentmods.dev/skills/jubakitiashvili/everything-react-native-expo/erne-code"><img src="https://agentmods.dev/badge/skills/jubakitiashvili/everything-react-native-expo/erne-code.svg" alt="Measured on agentmods" height="20"></a>
Per session 14 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 334 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00014 $0.00334
Opus 5 $0.00007 $0.00167
Sonnet 5 $0.00003 $0.00067
Haiku 4.5 $0.00001 $0.00033

Measured 8d ago against content hash 0f183e20b587, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

erne-code 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 8d 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.

.claude/skills/erne-code/SKILL.md · 34 lines

What it actually says

/erne-code — Feature Implementation

You are executing the /erne-code command. Use the senior-developer agent to implement production-grade feature code.

Process

  1. Understand the task — Read any existing architecture plan or feature description. If none exists, ask for scope and requirements.
  2. Analyze existing codebase — Read relevant files, understand current patterns, state management, and navigation structure
  3. Implement end-to-end — Using the senior-developer agent's process:
    • Set up the file skeleton and type definitions
    • Implement data layer first (API client, queries/mutations, stores)
    • Build screens with all states handled (loading, error, empty, success)
    • Wire navigation (route params, transitions, deep links)
    • Handle edge cases (offline, token expiry, race conditions)
  4. Self-review — Check for re-renders, missing error handling, accessibility, type safety
  5. Deliver — Complete implementation with file paths, type definitions, and integration notes

When to Use

  • Implementing a feature from an architect plan
  • Building screens, hooks, API integration, and state management
  • End-to-end feature work that touches multiple files

Notes

  • Reference the active platform rules layer for conventions
  • Follow the project's import ordering: react -> react-native -> expo -> external -> internal -> types
  • If the task is a single isolated unit (one screen, one hook), consider /erne-feature instead
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. 8d ago First seen · 34 lines · 14 tokens per session scan A 0f183e20b587

Subscribe to this mod's changes

erne-code is a skill published in the GitHub repository JubaKitiashvili/everything-react-native-expo (44 stars, last pushed 5mo ago), licensed MIT. It adds 14 tokens to every session and 334 once invoked, about $0.0001 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 2026-08-30.

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