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fix(anthropic): use non-whitespace trailing dummy to satisfy provider validation #6216

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davidzhao merged 1 commit into from
Jun 26, 2026
+1 −1
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fix(anthropic): use non-whitespace trailing dummy to satisfy provider validation #6216

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2 changes: 1 addition & 1 deletion livekit-agents/livekit/agents/llm/_provider_format/anthropic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -98,7 +98,7 @@ def to_chat_ctx(
# Claude 4.6+ does not support prefilling (trailing assistant messages).
# Append a dummy user message so the request ends with a user turn.
if inject_trailing_user_message and messages and messages[-1]["role"] == "assistant":
messages.append({"role": "user", "content": [{"text": " ", "type": "text"}]})
messages.append({"role": "user", "content": [{"text": ".", "type": "text"}]})

return messages, AnthropicFormatData(system_messages=system_messages)

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