macros are expanded. Expanding macros requires name resolution, which,
Agent 会自动调用 mco 命令，通过它指挥其他 Agent 并行执行任务。不需要去背 MCO 的参数，Agent 读一下 mco -h 自己就知道怎么用了。
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For implementers, this promise-heavy design constrains optimization opportunities. The spec mandates specific promise resolution ordering, making it difficult to batch operations or skip unnecessary async boundaries without risking subtle compliance failures. There are many hidden internal optimizations that implementers do make but these can be complicated and difficult to get right.
that became its undoing.