fix: route deepseek through chat completions#6
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The Anthropic message format drops reasoning blocks that carry no signature, and DeepSeek never issues one. A reasoning-only assistant turn — which DeepSeek produces routinely, since it returns reasoning_content with empty content — therefore lowers to `content: []`, and the API rejects the whole request with "all messages must have non-empty content". Once such a turn is in the history every later request in that session fails, so the session is unrecoverable. Chat Completions lowers the same turn to `content: ""`, which DeepSeek accepts, and round-trips reasoning_content as its thinking mode requires — something the Anthropic route cannot do at all.
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The Anthropic message format drops reasoning blocks that carry no signature, and DeepSeek never issues one. A reasoning-only assistant turn — which DeepSeek produces routinely, since it returns reasoning_content with empty content — therefore lowers to
content: [], and the API rejects the whole request with "all messages must have non-empty content". Once such a turn is in the history every later request in that session fails, so the session is unrecoverable.Chat Completions lowers the same turn to
content: "", which DeepSeek accepts, and round-trips reasoning_content as its thinking mode requires — something the Anthropic route cannot do at all.