epicenter

Apply Epicenter’s `#platform/*` build-time seam across browser, Tauri, and host targets. Use when adding or changing a seam, build condition, typecheck leaf, or deciding whether code belongs behind one.

Review cumulative implementation for structural collapse, invariant ownership, and correctness. Use for reviewing work after implementation, doing a second pass, or performing a final sweep. Independent structural verdicts belong to adversarial-review.

Build a throwaway prototype to answer a focused logic, state-model, or UI question before committing to production design. Use when the user asks to prototype, sanity-check a model, mock up UI, explore design options, or try a few designs.

Decide whether an authored piece is ready to represent its writer in public by testing recognition, legibility, integrity, and worth. Use before publishing a post, video, essay, or controversial idea; not for platform formatting or audience approval.

Draft and review Epicenter pull request titles and bodies, including changelog and merge details. Use when creating a PR or editing its text, not for local commits, branches, or issue replies.

Query boundaries with TanStack Query and Wellcrafted Results. Use when editing createQuery, createMutation, resultQueryOptions, resultMutationOptions, defineQuery, defineMutation, defineKeys, shared cache identity, mutation lifecycle, or service-to-TanStack adapters.

Compare a current approach with a cleaner design from first principles before editing. Use when an abstraction feels wrong, a fix becomes a band-aid, or complexity spreads across layers.

Apply caller-aware, behavior-preserving code simplifications such as inlining, branch collapse, and typed access boundaries. Use when cleaning up code or planning focused refactor commits.

Pursue the best possible version of a system, API, or abstraction, develop the vision through dialectic, and work backward to make it real. Use when the user asks for greenfield thinking, radical options, a clean break, first-principles design, or says the current abstraction feels wrong.

Rust to TypeScript error handling for Tauri apps. Use when mentioning Rust errors, Tauri command errors, invoke errors, or defining Rust error types for TS consumption.

Apply Whispering service-boundary patterns for UI-free capabilities, explicit inputs, Result fallibility, Live objects, lifecycle factories, and platform variants. Use when creating or refactoring services, contracts, provider dispatch, or the `$lib/services` barrel.

Draft social posts for LinkedIn, Reddit, or Twitter/X. Use when asked to write a post, tweet, announcement, or platform-specific version.

Execute `specs/*.md` plans through working checkpoints. Use when the user says "execute this spec", "implement this plan", "run the spec", or points at a spec file.

Write technical specs that let agents implement autonomously. Use for "write a spec", "plan this feature", "create a planning doc".

Split work into reviewable, auditable commits ordered by dependency. Use when planning commit waves, staging changes, or deciding whether a commit is too broad, tiny, incomplete, or hard to revert.

CSS and Tailwind, cn(), flex layouts. Use for "style this", "fix the CSS", "add classes", "not scrolling", "overflow", Tailwind utilities.

Apply Epicenter’s Svelte 5 patterns for runes, components, lifecycles, and workspace-backed state. Use when editing `.svelte`, `.svelte.ts`, or Svelte UI state.

Apply SvelteKit patterns for routing, server modules, form actions, hooks, cookies, adapters, and invalidation. Use when editing route files, hooks, `app.d.ts`, or SvelteKit behavior.

Animate SVGs with SMIL, CSS keyframes, stroke drawing, shape morphing, and motion paths. Use when adding motion to SVGs such as spinners, logos, draw-in effects, or morphing icons, not for static drawing or icon layout.

Apply TanStack Table UI-state patterns for Svelte data tables, including columns, rendering, sorting, filtering, pagination, and row identity. Use when building or reviewing data-table UI, not Epicenter workspace storage tables.