rn-debugging

rn-debugging is a skill for Claude Code, Codex from cmaranho/rn-agent-skills. It costs 50 tokens per session (470 once invoked), scanned A, original, MIT.

A systematic guide for finding and fixing bugs in React Native mobile apps. It covers crashes, runtime errors, blank screens, unexpected behavior, and differences between iOS and Android.

In plain words
What is it for?
Use it to investigate crashes, platform-specific bugs, regressions after native dependency changes, or other reproducible app failures. It helps collect evidence, isolate the cause, validate the fix, and prevent regressions.
Why use it?
It helps trace a problem back to its underlying cause using logs, stack traces, and repeatable tests. This reduces the risk of applying a fix based only on a guess.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to investigate crashes, platform-specific bugs, regressions after native dependency changes, or other reproducible app failures. It helps collect evidence, isolate the cause, validate the fix, and prevent regressions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/cmaranho/rn-agent-skills/rn-debugging
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.

Any agent
npx skills add cmaranho/rn-agent-skills --skill rn-debugging
Clone the repo
git clone --depth 1 https://github.com/cmaranho/rn-agent-skills

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.

agentmods badge for rn-debugging

README.md
[![agentmods](https://agentmods.dev/badge/skills/cmaranho/rn-agent-skills/rn-debugging/github.svg)](https://agentmods.dev/skills/cmaranho/rn-agent-skills/rn-debugging)
Your own site
<a href="https://agentmods.dev/skills/cmaranho/rn-agent-skills/rn-debugging"><img src="https://agentmods.dev/badge/skills/cmaranho/rn-agent-skills/rn-debugging/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for rn-debugging

Your own site · 80×15
<a href="https://agentmods.dev/skills/cmaranho/rn-agent-skills/rn-debugging"><img src="https://agentmods.dev/badge/skills/cmaranho/rn-agent-skills/rn-debugging.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 470 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 $0.00050 $0.00470
Opus 5.5 $0.00020 $0.00188
Sonnet 5.5 $0.00010 $0.00094
Haiku 4.5 $0.00005 $0.00047

Measured 1mo ago against content hash 8d3dac760e47, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rn-debugging 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 1mo 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.

skills/rn-debugging/SKILL.md · 52 lines

What it actually says

React Native — Debug

Objetivo

Encontrar a causa raiz de um problema com evidência, não por suposição, e corrigir com o menor blast radius.

Quando utilizar

  • Crash, erro em runtime, tela branca ou comportamento divergente.
  • Bug reproduzível apenas em um SO/dispositivo.
  • Regressão após mudança de dependência nativa.

Conhecimentos necessários

  • Ferramentas de debug (ex.: Flipper, Hermes/Chrome debugger, React DevTools, Logcat/Console).
  • Leitura de stack trace JS e nativo; source maps.
  • Diferenças de plataforma (permissões, APIs nativas, layout).
  • Reprodução determinística e bissecção.

Fluxo de execução

  1. Reproduza de forma confiável; anote passos, plataforma e versão.
  2. Colete evidência: logs, stack trace, estado e tráfego de rede.
  3. Forme uma hipótese e isole (bissecção, desabilitar partes, repro mínimo).
  4. Confirme a causa raiz com evidência antes de corrigir.
  5. Corrija no ponto certo; valide o cenário e os adjacentes; previna regressão com teste.

Boas práticas

  • Uma variável por vez; mude o mínimo para testar a hipótese.
  • Reproduza em ambos os SOs quando o bug for de UI/nativo.
  • Preserve source maps para builds de release.
  • Registre a causa raiz e a correção.

Armadilhas comuns

  • "Corrigir" o sintoma sem entender a causa.
  • Testar só no simulador (esconde bugs de dispositivo/permissão).
  • Assumir sem reproduzir; alterar muitas coisas de uma vez.
  • Ignorar logs nativos em crashes nativos.

Critérios de sucesso

  • Causa raiz identificada com evidência.
  • Bug não reproduz mais; sem regressão introduzida.
  • Teste ou guarda adicionado quando aplicável.
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. 1mo ago First seen · 52 lines · 50 tokens per session scan A 8d3dac760e47

Subscribe to this mod's changes

rn-debugging is a skill published in the GitHub repository cmaranho/rn-agent-skills (2 stars, last pushed 3mo ago), licensed MIT. It adds 50 tokens to every session and 470 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.