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fix(streaming): fire BetaInputJsonEvent for server_tool_use blocks #1446

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fix(streaming): fire BetaInputJsonEvent for server_tool_use blocks #1446

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9 changes: 8 additions & 1 deletion src/anthropic/lib/streaming/_beta_messages.py
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Original file line number Diff line number Diff line change
Expand Up @@ -365,7 +365,14 @@ def build_events(
)
)
elif event.delta.type == "input_json_delta":
if content_block.type == "tool_use" or content_block.type == "mcp_tool_use":
# Server-side tools (server_tool_use) stream input_json_delta the
# same way client-side tool_use blocks do, and the accumulator's
# TRACKS_TOOL_INPUT tuple (see below) already includes
# BetaServerToolUseBlock — so the SDK accumulates `content_block.input`
# correctly. We just weren't firing the parsed event for them, which
# forced consumers to bypass BetaInputJsonEvent and match on the raw
# delta. Fire it for server_tool_use too. (closes #1421)
if content_block.type in ("tool_use", "mcp_tool_use", "server_tool_use"):
events_to_fire.append(
build(
BetaInputJsonEvent,
Expand Down