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The after() API in Next.js enables non-blocking side effects that execute after the response completes. Learn when to use it, how it differs from alternatives, and the production tradeoffs that matter.

Most agentic workflow failures stem from naive model selection. Learn the deterministic rules for routing subagents to Haiku, Sonnet, or Opus based on task complexity, token throughput, and cost constraints.

Most TypeScript developers reach for Record by default, but Map provides runtime guarantees that static types cannot. Learn when each structure prevents bugs in production.