A12-13·深读SourcePh" style="display:none"
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Correlate — Links tool-use requests in assistant messages to their results in user messages via tool_use_id. This is how file content (which only appears in results, not requests) gets attached to each operation.
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.