Use when a task is non-trivial and no preloaded skill clearly fits, when the user asks which skill to use, or when the user wants to manage, trim or audit a large skill library. Routes to the right skill via search_skills/read_skill and runs skillrouter…
Audit web UI against WCAG: color contrast, keyboard navigation, focus order and screen reader labels. Use when checking accessibility.
Authentication with JWT and OAuth2: issuing and refreshing tokens, session security, password hashing and login flows. Use when implementing login or auth middleware.
AWS Lambda functions with API Gateway, IAM roles, layers and deployment through SAM or CDK. Use when building serverless on AWS.
Application caching: Redis, HTTP cache headers, invalidation strategies and memoization. Use when adding or fixing a cache.
Build apps with the Claude API and the Anthropic SDK: messages, tool use, streaming, prompt caching and batches. Use when code imports anthropic.
Chart and dashboard design: picking the chart type, color scales, labels and accessibility. Use when creating charts or plots.
Zero-downtime database migrations: expand and contract, backfills, rollbacks and locks for Postgres and MySQL. Use when changing a schema.