feat(providers/anthropic): add MessageSerializationCache to avoid O(N²) message serialization#25
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feat(providers/anthropic): add MessageSerializationCache to avoid O(N²) message serialization#25
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…²) message serialization Each agentic loop step re-serializes the entire message history via MarshalJSON. This adds a MessageSerializationCache interface that callers can pass through ProviderOptions. When present, toPrompt caches each output MessageParam's serialized JSON and applies param.SetJSON on subsequent steps to short-circuit MarshalJSON. Messages with cache_control breakpoints are excluded since their annotations change between steps.
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Adds
MessageSerializationCachesupport to the Anthropic provider so callers can avoid O(N²) message serialization across agentic loop steps.provider_options.go:MessageSerializationCacheinterface,MessageCacheKeyconstant,GetMessageCache()extractoranthropic.go:prepareParamsextracts cache fromcall.ProviderOptions;toPromptgains cache parameter +blockHasCacheControltracking; newapplySerialisationCache()handles hit/miss/skip per outputMessageParamviaparam.SetJSONanthropic_test.go: existingtoPromptcall sites updated to passnil(no behavior change)Consumer PR: coder/coder#24407