Skill Claude CodeCodex
Application performance for backend (Go+Fiber, Python+FastAPI), web frontends, and React Native mobile clients. Use when measuring or improving Web Vitals (LCP / INP / CLS), mobile FPS / TTI / memory, image/font/code-split optimization, profiling, or interpreting Lighthouse / Reanimated / Hermes / Flipper traces.…
Skill Claude Code
Write modern, secure PHP 8.x — typed properties, enums, readonly, match, constructor promotion, PSR standards, Composer — and avoid the legacy footguns (SQL injection, XSS, unsafe deserialization, eval). Use when writing or reviewing PHP, modernizing a legacy codebase, setting up Composer/autoloading, hardening…
Skill Claude CodeCodex needs its repo
Drive the pr-mode autonomous git loop for a consumer repo (COSGITWORKFLOW=pr). Use after cos pr submit to poll CI and act on the result. Triggers — "drive the PR", "CI is red", "is the PR merged", "retry the failing check", "pr-mode loop", any turn waiting on an agent PR's CI.
Skill Claude CodeCodex
Build production realtime servers over WebSockets and Server-Sent Events — connection lifecycle, the heartbeat/ping-pong + idle-timeout contract, automatic reconnection with exponential backoff and resume tokens, backpressure and per-connection send queues, horizontal scale-out via a Redis/NATS pub-sub fan-out…
Skill Claude Code
Use Redis correctly as a cache, queue, rate limiter, and ephemeral store — pick the right data structure, caching pattern, eviction policy, and atomicity model. Use when adding caching, designing a key schema, choosing cache-aside vs write-through, setting TTLs/eviction, building a rate limiter or queue, debugging low…
Skill Claude CodeCodex
Design and operate full-text and vector search infrastructure — inverted-index engines (Elasticsearch/OpenSearch, Meilisearch, Typesense), analyzers and tokenization, relevance tuning (BM25, boosting, synonyms), faceting, and semantic/vector search (embeddings, ANN indexes, hybrid retrieval). Use when adding a search…
Skill Claude CodeCodex
Use for ANY search, find, replace, or rename operation across a codebase — text literals, code symbols, semantic concepts, docs, or tasks. INVOKE BEFORE grep, before rename, before "find all X", before any cross-cutting edit. Enforces ground-truth counting before edits so nothing gets missed. Triggers — "find all"…
Skill Claude CodeCodex
Mobile-specific security per OWASP MASVS v2 (Mobile Application Security Verification Standard). Use when designing or reviewing secure storage (Keychain/Keystore vs SharedPreferences/UserDefaults), certificate pinning, root/jailbreak detection, biometric authentication, deep-link injection defenses, IPC hardening…
Skill Claude CodeCodex
Server-side / API-side security per OWASP Top-10 (2025 release). Use when writing or reviewing backend code (Go+Fiber business core, Python+FastAPI AI adapter, Node) for broken access control, security misconfiguration, supply-chain failures, cryptographic mistakes, injection, insecure design, authentication failures…
MCP server Claude CodeCodexCursor +2
The cognitive operating system that gives AI agents memory, structure, and discipline. Runs locally from the coding-os Python package.
Skill Claude Code
Write production-grade shell and CLI scripts — Bash and Python. Use when authoring or reviewing any script, Makefile target, hook, CI step, or automation that takes input, does work, and reports a result. Enforces runtime arguments (not hardcoded paths), fail-closed error handling, progress/observable output…
Skill Claude Code
Write correct, fast, injection-proof SQL queries — SELECT/INSERT/UPDATE/DELETE, joins, CTEs, window functions, pagination, upserts. Use when writing or reviewing any query, reading an EXPLAIN plan, fixing an N+1, choosing keyset vs offset pagination, or porting SQL between PostgreSQL and MySQL. Covers parameterization…
Skill Claude CodeCodex
Choose and implement state management for React Native + React + Vue + Svelte clients. Use when adding any client state — server-cache, global UI state, form state, navigation state. Covers the layer hierarchy (server-state vs client-state vs URL state vs local state), Zustand / Redux Toolkit / MobX / Pinia / Riverpod…
Skill Claude Code
Build on Supabase correctly — Row Level Security, auth, realtime, storage, edge functions, and the Postgres underneath. Use when wiring a Supabase client, writing or reviewing RLS policies, debugging "anyone can read everyone's rows", setting up auth, adding realtime subscriptions, handling file storage, or deciding…
Skill Claude Code
Use when creating, modifying, or transitioning Scrumban tasks in docs/tasks/. Triggers on "create a task", "move task", "start task X", "what's blocked", "daily standup", "retro", or any edit to docs/tasks/TASK-.md.
Skill Claude Code needs its repo
Write documentation, READMEs, ADRs, runbooks, commit/PR bodies, and code comments that a reader acts on without re-reading. Use when authoring or reviewing any prose deliverable — a playbook, a spec, an API doc, a migration note, a release changelog, or an in-code comment. Enforces altitude (right level of detail)…
Skill Claude CodeCodex
Author and operate infrastructure-as-code with Terraform/OpenTofu and Kubernetes manifests — declarative provisioning, state management, modules, plan/apply discipline, and the K8s object model (Deployment/Service/Ingress, probes, requests/limits, HPA, ConfigMap/Secret, RBAC). Use when writing a Terraform module…
Skill Claude CodeCodex
Choose the right test type for every change — unit, integration, contract, end-to-end, property-based, mutation, fuzz. Use when adding tests to a new feature, deciding what to test for a bug fix, designing a test pyramid for a service, evaluating coverage targets, or untangling a slow test suite. Stack-agnostic…
Skill Claude CodeCodex
Cognitive operating system for structured problem solving. Use when designing features, planning projects, debugging issues, implementing solutions, analyzing requirements, writing specs, breaking down tasks, investigating bugs, architecting systems, reviewing designs, or thinking through any non-trivial problem.…
Skill Claude Code
Write type-safe TypeScript that catches bugs at compile time — strict config, type narrowing, discriminated unions, generics, utility types, and avoiding the any/!-escape-hatches that silently disable the checker. Use when setting up tsconfig, modeling a domain with types, fixing "type X is not assignable", deciding…
Skill Claude CodeCodex
Use when creating or modifying TypeScript/HTML/CSS files under src/frontend/ in an Angular SPA — standalone components, injectable services, signals, RxJS streams, routes, guards, interceptors, and their tests. Triggers on any .ts/.html change under src/frontend/. Covers standalone bootstrap, signal-driven change…
Skill Claude CodeCodex
Use when creating or modifying C# files under src/backend/ in an ASP.NET Core service — Program bootstrap, minimal-API endpoints or controllers, services, middleware, DI registrations, DTOs, and their tests. Triggers on any .cs change under src/backend/. Covers DI/container wiring, thin endpoints, the global…
Skill Claude CodeCodex
Use when creating or modifying files under src/frontend/ in an Astro app — .astro pages and components, islands (client: directives), content collections (src/content/), API endpoints (pages/api/), and their config. Triggers on any .astro or .ts change under src/frontend/. Covers static-first SSG rendering, minimal…
Skill Claude CodeCodex
Use when creating or modifying Python files in the src/backend/ directory — Django models, DRF views, serializers, services, selectors, Celery tasks, migrations, or tests. Triggers on any .py file change under src/backend/. Covers architecture patterns (services + selectors), exception hierarchy, error envelope, file…
At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: