type-level-error-messages
Make compile-time errors readable by branding constraint-violation types as template literal messages with a U+200B zero-width-space suffix. Use when writing helper functions that constrain object keys, string shapes, or other literal-type inputs and you want the TypeScript error tooltip to read as an English sentence pointing at the offending value.
typebox
TypeBox patterns for runtime schema validation and JSON Schema generation. Use when mentioning TypeBox, Standard Schema, or schema-based validation.
typescript
TypeScript project conventions: derived types, type placement, acronym casing, imports, generics, factories, and runtime schema patterns. Use when editing `.ts` files, defining exported types, reviewing type names, or organizing type tests.
ui-design
UI design and component-system collapse hub for Epicenter interfaces. Use when designing, implementing, polishing, redesigning, or reviewing visible UI; choosing @epicenter/ui components; changing packages/ui; building Svelte state surfaces; or replacing class-heavy markup, arbitrary Tailwind values, custom colors, and local interface primitives. Every meaningful UI change preserves the user-visible objective while challenging inherited structure and collapsing toward shared primitives. Not for a tiny CSS-only repair unless it reveals a broader pattern.
workspace-api
Epicenter workspace API patterns: `defineWorkspace`, `defineTable`, `defineKv`, table `.docs(...)`, migrations, actions, `connect(...)`, `mount(...)`, materializers, and lower-level `createWorkspace` / `openCollaboration` primitives. Use when editing workspace schemas, table/KV access, row child docs, actions, runtime connections, daemon mounts, or collaboration setup.
workspace-app-composition
How a workspace-backed app under `apps/*` is composed: the isomorphic doc factory (`create<App>`), the environment factories (`open<App>Browser` / `open<App>Extension` / tauri) with the one boot call (`connect(toConnection(auth, nodeId))`, ADR-0088/ADR-0094), the `#platform/*` build-time platform DI for multi-platform (Tauri) apps, the workspace singleton, the sign-in migration wiring, daemon/script placement under per-project `workspaces/<app>/`, and the file layout itself. Use when creating a new app, naming or placing the iso/browser/extension factory, wiring `#platform/*` subpath imports for a Tauri seam, placing the workspace singleton, wiring the first-sign-in migration, registering daemon/script bindings, or gating first paint on local storage hydration (load gate vs WorkspaceGate).
worktree-hygiene
Reap merged git worktrees and branches safely across the warp, codex, opencode, and conductor harnesses. Use when worktrees pile up, after a branch merges, when cleaning up `git worktree list`, removing an orphaned or detached worktree, or deciding whether a worktree is safe to delete. Not for creating branches or authoring commits (use the git skill).
writing-voice
House voice for substantial prose: clear, direct, natural, and read-aloud friendly. Use for voice passes, tone work, rewrites, or prose that sounds corporate or AI-shaped.
wxt
WXT browser extension patterns for entrypoints, background service workers, content scripts, side panels, storage, permissions, host permissions, browser compatibility, and build commands. Use when editing apps/tab-manager, wxt.config.ts, src/entrypoints, extension manifests, or @wxt-dev/storage usage.
yjs
Yjs CRDT patterns, shared types (Y.Map, Y.Array, Y.Text), transactions, y-protocols sync and awareness, y-indexeddb persistence, conflict resolution, and document storage. Use when mentioning Yjs, Y.Doc, CRDTs, collaborative editing, real-time sync, awareness, IndexeddbPersistence, or Yjs providers.
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