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v.0x port of #8875

Handle response.custom_tool_call_input.delta events to enable streaming
for custom tools in the Responses API. Previously only function call
deltas were captured, breaking streaming for custom tools.

Fixes #8854
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@christian-bromann christian-bromann changed the title fix(openai): add streaming support for custom tools fix(openai/0.x): add streaming support for custom tools Sep 8, 2025
@christian-bromann christian-bromann merged commit 3af3d9e into main Sep 9, 2025
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@christian-bromann christian-bromann deleted the cb/openai-stream-chunk-fix-v0.x branch September 9, 2025 16:27
hntrl added a commit that referenced this pull request Oct 14, 2025
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