Self-evolving skill packs that give Claude Code & Codex judgment, not knowledge — decidable rules, per-playbook regression quizzes for models, and a project harness generator. zh-TW canon + full EN mirror.
Skill Claude CodeCodex
Use when creating a new custom agent/subagent definition (.claude/agents/.md), auditing or rewriting existing agent definitions, deciding whether a task deserves a dedicated agent vs general-purpose with a good prompt, choosing an agent's tools whitelist or model tier, or when delegated agents keep going off-scope…
Skill Claude CodeCodex
Use when writing, refactoring, or debugging Android app code (Kotlin, Jetpack Compose, Gradle, ProGuard/R8) — before adding a feature, touching build config or proguard-rules, preparing a release/AAB, or when facing release-only crashes, ClassNotFoundException after minify, lifecycle leaks, ANR, or excessive…
Skill Claude CodeCodex
Use when designing, changing, or debugging backend server code (REST, Node.js/TypeScript, Go), especially endpoints, response envelopes, pagination, migrations, queries, auth, password hashing, secrets, or deploys; also for N+1 queries, races, IDOR, SSRF/injection, goroutine leaks, unhandled rejections, event-loop…
Skill Claude CodeCodex
Use when about to spawn or delegate work to a subagent (Agent/Task tool), choosing a model tier (haiku/sonnet/opus/fable) for a task, writing a delegation prompt, deciding whether something should be delegated at all, deciding whether to dispatch multiple subagents in parallel, verifying a delegated result, or after a…
Skill Claude CodeCodex
Use when a feature or refactor changes public contracts, schemas, shared integration points, cross-layer data flow, release behavior, or other high-risk architecture decisions.
Skill Claude CodeCodex
Use when writing, refactoring, or debugging Flutter/Dart app code (widgets, Riverpod, Bloc, setState, platform channel, pubspec) — before adding a screen, choosing state management, measuring performance, adding a plugin, or preparing a release build. Also when facing jank/dropped frames, rebuild storms, release mode…
Skill Claude CodeCodex
Use when writing, refactoring, or debugging React/Next.js frontend code (App Router, Server/Client Components, hooks, Tailwind/CSS Modules) — before adding a component, choosing where state lives, wiring data fetching, or preparing a production deploy; or when facing hydration mismatch, NEXTPUBLIC env leaks, excessive…
Skill Claude CodeCodex
Use when designing or debugging high-concurrency Go services, especially worker pools, backpressure, bounded channels, errgroup/WaitGroup, rate limits, load shedding, circuit breakers, GOMAXPROCS, or connection pools; also for load-time OOM, rising goroutines, lock contention, p99 spikes, retry storms, pprof…
Skill Claude CodeCodex
A library of approved writing examples for commit messages, Japanese interface text, code-review comments, and completion reports. It is designed to preserve the wording and tone a team has previously accepted.
Skill Claude CodeCodex
Use when creating, regenerating, or auditing a repository-specific development harness, contract system, risk router, evidence gate, or project workflow policy.
Skill Claude CodeCodex
Use when writing, refactoring, or debugging iOS app code (Swift, SwiftUI, Swift Concurrency, Xcode) — before adding a feature, choosing state ownership (@State / @Observable / @Environment), touching MainActor/actor/Sendable, preparing a TestFlight/App Store build, or when facing App Store review rejection…
Skill Claude CodeCodex
Use when building or polishing mobile app UI visuals (Flutter, SwiftUI, Jetpack Compose) — before choosing spacing, typography, color, corner radius, elevation, or motion duration; when a screen "looks off", feels cluttered, cheap, or inconsistent; when reviewing touch targets, contrast ratio, Dynamic Type, text…
Skill Claude CodeCodex
Use when building or debugging RAG / semantic search / retrieval systems — before choosing a vector store (pgvector, Qdrant, Milvus, Elasticsearch), designing chunking, embedding models, hybrid search (BM25 + vector), HNSW indexing, or a reranker; or when facing bad recall, "retrieved the wrong docs", LLM answers…
Skill Claude CodeCodex
Use when working in a technical domain with no existing playbook, writing new coding guidelines / review criteria / checklists from scratch, judging whether a verification method actually proves a claim (test passed but does it count?), or when repeated fixes keep failing and the direction feels wrong. Domain-agnostic…