Enforce Effect-first code standards as part of the agent loop
Skill Claude CodeCodex
Build stateful AI chat sessions with the Effect Chat module. Use this skill when implementing multi-turn conversations, agentic tool-calling loops, chat persistence, streaming chat responses, or structured object generation within a conversation context.
Skill Claude CodeCodex
Master the Effect AI LanguageModel service for text generation, structured output, streaming, and tool calling. Use when working with LLM interactions, schema-validated responses, or building conversational AI systems.
Skill Claude CodeCodex
Build prompts for Effect AI using messages, parts, and composition operators. Covers the complete Prompt API for constructing, merging, and manipulating conversations with language models.
Skill Claude CodeCodex
Configure and compose AI provider layers using @effect/ai packages. Covers Anthropic, OpenAI, OpenAI-Compat, and OpenRouter providers with config management, model abstraction, ExecutionPlan fallback, and runtime overrides for language model integration.
Skill Claude CodeCodex
Master Effect AI streaming response patterns including start/delta/end protocol, accumulation strategies, resource-safe consumption, and history management with SubscriptionRef.
Skill Claude CodeCodex
Define and implement AI tools using Effect AI's Tool and Toolkit APIs. Use when building LLM integrations with type-safe tool definitions, parameter validation, and handler implementations. Covers user-defined tools, provider-defined tools, and toolkit composition.
Skill Claude CodeCodex
Build reactive Atom-aware RPC clients for React/Atom UIs using AtomRpc. Provides cached query atoms, invalidating mutation atoms, SSR hydration, and reactivity-key invalidation on top of an RpcGroup.
Skill Claude CodeCodex
Implement reactive state management with Effect Atom for React applications.
Skill Claude CodeCodex
Implement automatic request batching and deduplication using Effect's Request, RequestResolver, and SqlResolver APIs. Use this skill when solving N+1 query problems, building batched data-fetching layers, or integrating request caching with resolvers.
Skill Claude CodeCodex
Cache effectful lookups in memory with Cache and ScopedCache — capacity/LRU eviction, fixed or exit-aware TTL, deduplicated concurrent lookups, refresh/invalidation, and resource-owning entries with per-entry scopes. Use when memoizing effectful lookups by key, adding TTL caching to API or DB reads, deduplicating…
Skill Claude CodeCodex
Build type-safe CLI applications using Effect CLI module for argument parsing, options, commands, and dependency injection.
Skill Claude CodeCodex
Spawn and manage child processes using Effect's ChildProcess module. Use this skill when running shell commands, capturing process output, piping commands, streaming long-running process output, or managing process lifecycles with scoped cleanup.
Skill Claude CodeCodex
Test Effect concurrency primitives including PubSub, Deferred, Latch, Fiber coordination, SubscriptionRef, and Stream. Use this skill when testing concurrent effects, event-driven systems, or fiber coordination.
Skill Claude CodeCodex
Load and validate typed configuration with Config and ConfigProvider. Use this skill when reading environment variables, building structured config, providing test config, or working with .env files, JSON config, and custom config sources.
Skill Claude CodeCodex
Decide between Context.Service witness and capability patterns for dependency injection, understanding coupling trade-offs.
Skill Claude CodeCodex
Create production-ready Effect domain models using Schema.TaggedStruct for ADTs, with comprehensive predicates, orders, guards, and match functions. Use when modeling domain entities, value objects, or any discriminated union types.
Skill Claude CodeCodex
Generate comprehensive predicates and orders for domain types using typeclass patterns.
Skill Claude CodeCodex
Implement typed error handling in Effect v4 using Schema.TaggedErrorClass, catchTag/catchTags, catchReason/catchReasons, Cause, ErrorReporter, and recovery patterns. Use this skill when working with Effect error channels, handling expected failures, or designing error recovery strategies.
Skill Claude CodeCodex
Fork, supervise, and interrupt Effect fibers with Effect.forkChild/forkScoped/forkIn/forkDetach, Fiber join/await/interrupt, uninterruptible regions, and the FiberHandle/FiberMap/FiberSet supervision collections. Use when running background work, cancelling or restarting tasks, implementing latest-wins or keyed…
Skill Claude CodeCodex
Use Effect FileSystem for platform-abstract file I/O with Node.js/Bun layers or custom implementations.
Skill Claude CodeCodex
Build and analyze immutable graphs with Effect's Graph module — directed/undirected construction, scoped mutation (mutate/addNode/addEdge), node/edge queries, lazy DFS/BFS/topo walkers, algorithms (isAcyclic, stronglyConnectedComponents, dijkstra/astar/bellmanFord/floydWarshall), and GraphViz/Mermaid export. Use when…
Skill Claude CodeCodex
Build typed HTTP APIs with Effect's HttpApi — endpoints with schemas, handlers, security middleware, OpenAPI docs, derived clients, and handler unit tests. Use when building HTTP servers, REST APIs, or typed HTTP clients with Effect v4.
Skill Claude CodeCodex
Make outgoing HTTP requests with Effect's HttpClient — HttpClientRequest builders, schema-decoded HttpClientResponse bodies, the HttpClientError taxonomy, retryTransient/rate limiting/cookies/redirects, streaming uploads and downloads, and FetchHttpClient/NodeHttpClient transport layers. Use when calling external…
Skill Claude CodeCodex
Build HTTP servers with effect/unstable/http — HttpRouter routes and middleware, HttpServerRequest schema decoding, HttpServerResponse constructors, multipart uploads, websocket upgrades, static files, NodeHttpServer/BunHttpServer layers, and in-memory web handlers. Use when serving raw HTTP routes, reading request…
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: