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fix(tool_runner): propagate container_id for programmatic tool calling #1150

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fix(tool_runner): propagate container_id for programmatic tool calling #1150

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8 changes: 8 additions & 0 deletions src/anthropic/lib/tools/_beta_runner.py
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Original file line number Diff line number Diff line change
Expand Up @@ -246,6 +246,10 @@ def __run__(self) -> Iterator[RunnerItemT]:
message = self._get_last_message()
assert message is not None

# Update container from response for programmatic tool calling support
if message.container is not None:
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@karpetrosyan karpetrosyan Feb 25, 2026

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@stephaniepang97 Can we, instead of using the container.id from the last API response, rely on the last assistant message (runner._get_last_assistant_message_content)? The user might change the state during the loop (e.g., in a for block via set_messages_params), so we should take the ID from the last message in the current state, not from the last API response

self._params["container"] = message.container.id

self._iteration_count += 1

# If the compaction was performed, skip tool call generation this iteration
Expand Down Expand Up @@ -497,6 +501,10 @@ async def __run__(self) -> AsyncIterator[RunnerItemT]:
message = await self._get_last_message()
assert message is not None

# Update container from response for programmatic tool calling support
if message.container is not None:
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@karpetrosyan karpetrosyan Feb 25, 2026

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Can we add a simple test for this case to make sure we’re sending container.id back? We can use a snapshot with a real example and record it, like we do in the other tests.

self._params["container"] = message.container.id

self._iteration_count += 1

# If the compaction was performed, skip tool call generation this iteration
Expand Down
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