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What are sub-agents, and how does an orchestrator delegate to them effectively?

Sub-agents are how you scale a complex agent task without one giant, noisy context. The signal is context isolation and clean delegation: a focused subtask in, a compact result out. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Sub-agents are how you scale a complex agent task without one giant, noisy context. The signal is context isolation and clean delegation: a focused subtask in, a compact result out. Here is the answer.

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Agent Engineering·Tools as an interfaceFree14mDesigning an API for a consumer that cannot read the docsA tool set is an API whose only user is a model with no memory of your codebase and no way to ask. That constraint changes granularity, naming and error design in specific ways, and most tool sets are built as though a person were reading them.Agent Engineering·Memory and contextSign in14mWhat to drop when the context fillsEvery long run eventually has more history than budget. The order in which you discard things decides whether the agent stays coherent or quietly loses the thread, and the default of dropping the oldest messages is close to the worst option available.
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