Service layer patterns with defineErrors, namespace exports, and Result types. Use when the user says "create a service", "service layer", or when creating new services, defining domain-specific errors, or understanding the service architecture.
Elysia.js server patterns for error handling, status responses, and plugin composition. Use when the user mentions Elysia, Eden Treaty, or when writing API route handlers, returning HTTP errors, creating server plugins, or working with type-safe API clients.
Move helper functions into return objects using method shorthand for proper JSDoc preservation. Use when factory functions have internal helpers that should expose documentation to consumers, or when hovering over returned methods shows no JSDoc.
Pattern for functions that accept either a single item or an array. Use when creating CRUD operations, batch processing APIs, or factory functions that should flexibly handle one or many inputs.
Tauri path handling, cross-platform file operations, and API usage. Use when the user mentions Tauri, desktop app, or when working with file paths in Tauri frontend code, accessing native filesystem APIs, invoking Tauri commands, or handling platform differences.
Yjs CRDT patterns, shared types (Y.Map, Y.Array, Y.Text), conflict resolution, and document storage. Use when the user mentions Yjs, Y.Doc, CRDTs, collaborative editing, or when handling shared types, implementing real-time sync, or optimizing document storage.
How to define and use defineErrors from wellcrafted. Use when creating new error types, updating error definitions, or reviewing error patterns. Covers variant factories, extractErrorMessage for cause, InferErrors/InferError for types, and call site patterns.
Encryption patterns for HKDF key derivation, XChaCha20-Poly1305 symmetric encryption, encrypted blob formats, key hierarchy, and key rotation. Use when the user says "encrypt this", "add encryption", "key management", or when working with crypto primitives, encrypted CRDT values, or the EncryptedBlob type.
Query layer patterns for consuming services with TanStack Query, error transformation, and runtime dependency injection. Use when the user mentions createQuery, createMutation, TanStack Query, or when implementing queries/mutations, transforming errors for UI, or adding reactive data management.
Svelte 5 patterns including runes ($state, $derived, $props), TanStack Query, SvelteMap reactive state, shadcn-svelte components, and component composition. Use when the user mentions .svelte files, Svelte components, or when using TanStack Query, fromTable/fromKv, or shadcn-svelte UI.
Sync construction with async property pattern for module-exportable clients. Use when the user says "async init", "module-level async", or when creating clients that need async initialization but must be exportable from modules and usable synchronously in UI components.
Execute a specification document through planned waves of parallel and sequential changes, updating the spec and committing after each wave. Use when the user says "execute this spec", "implement this plan", "run the spec", or when given a specs/*.md file to implement.
How to update the Pub/Sub emulator
Feishu message emoji reactions. Activate when user mentions emoji, reaction, thumbsup, like, or responding to messages with emoji.
Feishu urgent message (buzz) notifications. Activate when user mentions urgent, buzz, remind, or escalation for messages.
Error Pattern Safety Guidelines for Agentic Engines
Instructions for using the struct tag-based console rendering system in Go
Converts Stitch designs into modular Vite and React components using system-level networking and AST-based validation.
