fix(anthropic): use correct content_block format for tool_use in cache replay#1601
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agzarifis wants to merge 1 commit intoPortkey-AI:mainfrom
Open
fix(anthropic): use correct content_block format for tool_use in cache replay#1601agzarifis wants to merge 1 commit intoPortkey-AI:mainfrom
agzarifis wants to merge 1 commit intoPortkey-AI:mainfrom
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…e replay
When a cached Anthropic /v1/messages JSON response is replayed as an
SSE stream, toolUseContentBlockStartEvent wraps the entire ToolUseBlock
inside a nested `tool_use` key:
content_block: { type: "tool_use", tool_use: { id, name, input: {} } }
The Anthropic streaming spec puts id and name at the content_block
level:
content_block: { type: "tool_use", id, name, input: {} }
The nested format causes downstream clients (e.g. langchain-anthropic)
to extract null id and name from the outer object, breaking tool call
processing on cache hits.
Promote id and name to the content_block level to match the real
Anthropic SSE format.
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Summary
toolUseContentBlockStartEventinstreamGenerator.tsto putidandnameat thecontent_blocklevel instead of nesting them under atool_usesub-key.Problem
When a cached Anthropic
/v1/messagesJSON response is replayed as an SSE stream viaanthropicMessagesJsonToStreamGenerator, thecontent_block_startevent fortool_useblocks is emitted as:{ "type": "content_block_start", "index": 0, "content_block": { "type": "tool_use", "tool_use": { "id": "toolu_01X...", "name": "my_tool", "input": {} } } }The Anthropic streaming spec puts
idandnameat thecontent_blocklevel:{ "type": "content_block_start", "index": 0, "content_block": { "type": "tool_use", "id": "toolu_01X...", "name": "my_tool", "input": {} } }This causes downstream clients (e.g.
langchain-anthropic'sChatAnthropic) to readnullforidandnamefrom the outer object, breaking tool call extraction on cache hits.Fix
Promote
idandnamefromtoolUseBlockto thecontent_blocklevel, matching the format used by Anthropic's real SSE stream and by the other content block helpers in the same file (textContentBlockStartEvent,thinkingContentBlockStartEvent).