Developer Tools & Repos Agent Skills

Use when designing APIs or module boundaries — contract-first, Hyrum Law, error semantics.

Use when Vue 3 Composition API with reactive refs, computed, and composables.

Enforces Flutter widget composition — extract named const Widget classes never `Widget _buildX()` methods, lean build() (no…

When to activate: WidgetKit, widget timelines, AppIntents, interactive widgets, widget configuration, SwiftUI widget views

Expert guidance for Windows, PowerShell, WSL interop, and cross-platform development

Build, troubleshoot, or set up native Windows C and C++ compilation with MinGW-w64, MSYS2, GCC, G++, Clang, LLVM, mingw32-make, static…

Deterministic, blocking validation of the project's docs/ brief against the harness-project API: roster existence, required sections, data…

Create or destroy a code-only git worktree for a PR, branch, or new task (fetch + checkout, no env/DB/ports/yarn/seed).

Replace React/effect-atom mutation handlers that use promise-mode plus try/catch with promiseExit and explicit Exit handling.

Replace duplicated TypeScript shape declarations next to Effect Schema definitions with schema-derived types.

Fix lint findings that use untyped JavaScript error handling instead of Effect typed failures.

Replace duplicated object API types with types inferred from the runtime value or factory that owns the shape.

Elite mobile app image-generation skill for creating premium, app-native screen concepts and flows.