react-typescript

Restructure existing code without changing its observable behavior — extracting, renaming, decomposing, deduplicating, or reshaping modules.

Design or change an HTTP, RPC, or GraphQL API surface — resources, methods, payload shapes, status codes, errors, pagination, versioning, authentication, and…

Design or change database schemas, indexes, constraints, and migrations for relational or document stores, and diagnose query performance.

Make structural frontend decisions — module and folder boundaries, state ownership, data-fetching strategy, rendering approach, routing, and performance…

Prepare a change for review — branch and commit hygiene, self-review of the diff, and writing a pull request description that explains intent, scope, testing…

Review a diff, pull request, or set of changes for correctness, security, and maintainability.

Build or modify web mapping features — MapLibre, OpenLayers, Leaflet, or similar — including layers, sources, styling, interactions, vector and raster tiles…

Write or modify Node.js services in TypeScript — Express, Fastify, NestJS, Hono, or plain HTTP — adapting to the project's framework, module system, and…

Write or modify Python web services — FastAPI, Django, Flask, or Starlette — adapting to the project's framework, dependency tooling, and async model.

Diagnose a bug, failing test, crash, regression, or unexplained behavior by forming and testing hypotheses against evidence instead of guessing at fixes.

Write, extend, or evaluate automated tests — unit, integration, or end-to-end — in a way that matches the project's existing framework and conventions.

Replace this with what the skill covers and when an agent should reach for it.