fix: explicitly merge usage fields in Accumulate using JSON presence checks#3
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ibetitsmike merged 3 commits intofantasyfrom Apr 8, 2026
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This was referenced Apr 7, 2026
kylecarbs
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Apr 8, 2026
johnstcn
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Apr 8, 2026
The examples go.mod was using github.com/anthropics/anthropic-sdk-go in its replace directive and require block, but the root module and all example Go files use github.com/charmbracelet/anthropic-sdk-go. This mismatch caused build failures.
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When a
MessageDeltaEventarrives during streaming,Accumulate()previously only assignedacc.Usage.OutputTokens. For non-server-tool conversations, Anthropic'smessage_deltaonly includesoutput_tokensin the JSON payload, omittinginput_tokensand cache token fields.This patch uses
Raw() != respjson.Omittedto check actual JSON field presence before updating each usage field. Fields omitted from the delta preserve their values from the initialmessage_startevent.Adds three test cases covering input+output accumulation, cache token preservation, and confirming omitted delta fields do not clobber message_start values.