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fix(tools): prevent tool_runner from exiting when server_tool_use blocks are present #1271

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fix(tools): prevent tool_runner from exiting when server_tool_use blocks are present #1271

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11 changes: 11 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 @@ -306,6 +306,13 @@ def _generate_tool_call_response(self) -> BetaMessageParam | None:

tool_use_blocks = [block for block in content if block.type == "tool_use"]
if not tool_use_blocks:
# When server-side tools (e.g. web_search, web_fetch) are present,
# the API responds with server_tool_use blocks and stop_reason="pause_turn".
# The runner should continue the loop so the server can return results.
has_server_tools = any(block.type == "server_tool_use" for block in content)
if has_server_tools:
log.debug("Server tool use detected, continuing runner loop.")
return {"role": "user", "content": []}
return None

results: list[BetaToolResultBlockParam] = []
Expand Down Expand Up @@ -598,6 +605,10 @@ async def _generate_tool_call_response(self) -> BetaMessageParam | None:

tool_use_blocks = [block for block in content if block.type == "tool_use"]
if not tool_use_blocks:
has_server_tools = any(block.type == "server_tool_use" for block in content)
if has_server_tools:
log.debug("Server tool use detected, continuing runner loop (async).")
return {"role": "user", "content": []}
return None

results: list[BetaToolResultBlockParam] = []
Expand Down