Root-cause analysis for bugs, incidents, and regressions — timeline, hypothesis testing with evidence, 5-whys, prevention rules feeding the memory loop. Use when investigating a production bug, an error log the user dropped in, or a recurring defect.
Read and understand an unfamiliar/legacy codebase safely before changing it — entry points, dependency tracing, behavior mapping, characterization tests, seams. Use during onboarding of an existing project or before any change in code you did not write.
Angular v19-v21 features: linkedSignal, resource/httpResource, signal forms, route-level SSR render modes, incremental hydration, zoneless change detection, Vitest migration, and Angular Aria components.
Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers. Use when designing new APIs, reviewing API specifications, or establishing API design standards.
Astro changes since training cutoff (latest: 6.0) — Fonts API, live collections, CSP, route caching, ClientRouter, Zod 4/Vite 7/Shiki 4. Load before working with Astro.
Axum changes since training cutoff (latest: 0.8.5) — {param} path syntax, no async_trait, OptionalFromRequestParts, Utf8Bytes WS, HTTP/2 WebSockets, NoContent. Load before working with Axum.
Guidelines for Blazor development including component lifecycle, state management, and performance optimization
Load automatically when planning, researching, or implementing ANY Medusa backend features (custom modules, API routes, workflows, data models, module links, business logic). REQUIRED for all Medusa backend work in ALL modes (planning, implementation, exploration). Contains architectural patterns, best practices, and critical rules that MCP servers don't provide.