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

.claude/skills/learn/SKILL.md

learn is a skill for Claude Code from JubaKitiashvili/everything-react-native-expo. It costs 17 tokens per session (449 once invoked), scanned A, a copy of erne-learn, MIT.

A manually started process that studies a coding session and suggests reusable rules or skills for future work. It looks at tool calls, file changes, repeated fixes, and existing guidance.

In plain words
What is it for?
Use it after a session with repeated solutions, style decisions, architecture patterns, or form and API behaviors worth recording.
Why use it?
Useful patterns can otherwise remain buried in one session. This process turns approved recurring patterns into project rules or new skills.

Skill for Claude Code

Written for Claude Code: PostToolUse hook event. Also seen: reads .claude/ paths.

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 →

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is node .claude/hooks/scripts/extract-session-patterns.js.

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/learn/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 learn

README.md
[![agentmods](https://agentmods.dev/badge/skills/jubakitiashvili/everything-react-native-expo/learn/github.svg)](https://agentmods.dev/skills/jubakitiashvili/everything-react-native-expo/learn)
Your own site
<a href="https://agentmods.dev/skills/jubakitiashvili/everything-react-native-expo/learn"><img src="https://agentmods.dev/badge/skills/jubakitiashvili/everything-react-native-expo/learn/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 learn

Your own site · 80×15
<a href="https://agentmods.dev/skills/jubakitiashvili/everything-react-native-expo/learn"><img src="https://agentmods.dev/badge/skills/jubakitiashvili/everything-react-native-expo/learn.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 449 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 94% 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 5.1 $0.00017 $0.00449
Opus 5 $0.00009 $0.00225
Sonnet 5 $0.00003 $0.00090
Haiku 4.5 $0.00002 $0.00045

Measured 9d ago against content hash a484ac92bd6c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

learn 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 9d 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

94% identical to erne-learn — 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.

.claude/skills/learn/SKILL.md · 57 lines

What it actually says

/learn — Generate Skills from Session

You are executing the /learn command. This is script-driven — it runs the continuous-learning-v2 pipeline directly.

What This Does

Analyzes the current coding session to extract reusable patterns and save them as skills or rule amendments for future sessions. This is the manual trigger for what PostToolUse hooks do automatically.

Process

  1. Run the extraction script:
node .claude/hooks/scripts/extract-session-patterns.js

This script:

  • Scans recent tool calls and file changes
  • Identifies patterns (repeated fixes, style corrections, common architectures)
  • Compares against existing rules and skills
  • Generates candidates for new content
  1. Review candidates: The script outputs a list of potential learnings:
[PATTERN] Zustand store always uses immer middleware → Suggest rule amendment
[PATTERN] All screens use SafeAreaView wrapper → Suggest coding-style rule
[PATTERN] API calls always retry 3 times → Suggest pattern rule
[SKILL] Complex form validation flow → Suggest skill creation
  1. Approve or reject each candidate: For each candidate, decide:
  • Approve → Script writes to .claude/rules/ or .claude/skills/
  • Reject → Skip this pattern
  • Edit → Modify before saving
  1. Validate new content:
node .claude/hooks/scripts/validate-content.js

Ensures new rules/skills have valid frontmatter and don't conflict with existing content.

When to Use

  • After a long coding session where you established new patterns
  • When you notice yourself repeatedly making the same corrections
  • After integrating a new library and establishing conventions
  • Periodically to capture accumulated project knowledge

Note

The automatic PostToolUse hook (continuous-learning-v2.cjs) does lightweight extraction after every tool call. This /learn command runs a comprehensive analysis that catches patterns the real-time hook might miss.

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. 9d ago First seen · 57 lines · 17 tokens per session scan A a484ac92bd6c

Subscribe to this mod's changes

learn is a skill published in the GitHub repository JubaKitiashvili/everything-react-native-expo (45 stars, last pushed 5mo ago), licensed MIT. It adds 17 tokens to every session and 449 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to erne-learn, differing in 10 lines, and is treated as a copy.

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