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Fix: append trailing user turn when assistant message would be last - #277
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GitHub Copilot's backend rejects Anthropic Messages API requests that end
on an assistant turn for newer Claude models (400 invalid_request_body,
'This model does not support assistant message prefill'). This appends a
placeholder user message ('Continue.') whenever
translateAnthropicMessagesToOpenAI would otherwise produce a trailing
assistant message, so Claude Code can use these models through copilot-api
without hitting this error.
An empty-string placeholder was tried first but is silently dropped by
the upstream backend, leaving the conversation ending on assistant again;
a non-empty placeholder is required.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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GitHub Copilot's backend rejects Anthropic Messages API requests that end on an assistant turn for newer Claude models (400 invalid_request_body, 'This model does not support assistant message prefill'). This appends a placeholder user message ('Continue.') whenever
translateAnthropicMessagesToOpenAI would otherwise produce a trailing assistant message, so Claude Code can use these models through copilot-api without hitting this error.
An empty-string placeholder was tried first but is silently dropped by the upstream backend, leaving the conversation ending on assistant again; a non-empty placeholder is required.