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d6785dc4d4
Three fixes for the (empty) response bug affecting open reasoning models: 1. Allow retries after prefill exhaustion — models like mimo-v2-pro always populate reasoning fields via OpenRouter, so the old 'not _has_structured' guard on the retry path blocked retries for EVERY reasoning model after the 2 prefill attempts. Now: 2 prefills + 3 retries = 6 total attempts before (empty). 2. Reset prefill/retry counters on tool-call recovery — the counters accumulated across the entire conversation, never resetting during tool-calling turns. A model cycling empty→prefill→tools→empty burned both prefill attempts and the third empty got zero recovery. Now counters reset when prefill succeeds with tool calls. 3. Strip think blocks before _truly_empty check — inline <think> content made the string non-empty, skipping both retry paths. Reported by users on Telegram with xiaomi/mimo-v2-pro and qwen3.5 models. Reproduced: qwen3.5-9b emits tool calls as XML in reasoning field instead of proper function calls, causing content=None + tool_calls=None + reasoning with embedded <tool_call> XML. Prefill recovery works but counter accumulation caused permanent (empty) in long sessions.