fix: emit ToolUseStreamEvent on contentBlockStart for thinking-phase tool calls #1569
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…tool calls When models with extended thinking execute tool calls during the reasoning phase, the tool use was never displayed to users because ToolUseStreamEvent was only emitted during contentBlockDelta events. Now emit a ToolUseStreamEvent immediately when contentBlockStart contains toolUse data, ensuring all tool executions are visible via the callback handler. Closes strands-agents#1551
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Summary
ToolUseStreamEventwas only emitted duringcontentBlockDelta, notcontentBlockStartToolUseStreamEventimmediately whencontentBlockStartcontainstoolUsedata, soPrintingCallbackHandlerdisplays "Tool #N: name" for all tool executionsTest plan
test_process_streamto account for new eventtest_process_stream_emits_tool_use_event_on_content_block_startverifying the fixCloses #1551