fix(swarm): prevent KeyError when converting assistant messages without tool calls - #2850
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…ut tool calls and fallback VertexAI imports
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✅ No documentation update needed — Internal bug fixes only (KeyError guard in swarm converter, VertexAI import fallback) with no user-facing API or usage changes; existing docstrings are unaffected. |
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Resolves #2813.
Description
OpenAI Swarm assistant messages that do not make tool calls typically contain only
roleandcontentkeys. When converted usingconvert_to_ragas_messages(), it was accessingmessage["tool_calls"]directly, raising aKeyError.Also, importing
ChatVertexAIandVertexAIdirectly fromlangchain_communityraisesModuleNotFoundErroron modern langchain environments because those modules were sunset or relocated.Changes
handle_assistant_message()inswarm.pyto use.get("tool_calls")instead of direct index access.ChatVertexAIandVertexAIinragas/llms/base.pyto fallback tolangchain-google-vertexaiif available.tests/unit/integrations/test_swarm.pyvalidating Swarm message conversion with and without tool calls.