In tool-enabled requests MindIEChatModel._astream falls back to awaiting the full _agenerate response and re-emitting it as simulated AIMessageChunks. The full response carries usage_metadata, but none of the simulated chunks copied it, so chunk aggregation (add_ai_message_chunks) produced a final message with usage_metadata=None. Token usage therefore vanished from token accounting, run stats, persistence and the UI for every tool-enabled streamed turn.
Mirror OpenAI's terminal-usage-frame convention: attach msg.usage_metadata to exactly the last simulated chunk (the trailing tool-call chunk when present, else the last text chunk / the single tool-only chunk) so the aggregated message carries it exactly once. add_usage() is per-chunk additive, so attaching usage to every chunk would multiply the totals.
Scope: MindIEChatModel only; other providers keep native streaming and ainvoke/non-tool astream were already correct.
Tests: regression guard asserting exactly one carrier chunk equals the last one and that merged usage equals the original across all three simulated-stream branches, plus chain-level tests driving the public astream() wrapper and asserting the persisted model_dump() shape.
Closes#5192
* feat(models): 适配 MindIE引擎的模型
* test: add unit tests for MindIEChatModel adapter and fix PR review comments
* chore: update uv.lock with pytest-asyncio
* build: add pytest-asyncio to test dependencies
* fix: address PR review comments (lazy import, cache clients, safe newline escape, strict xml regex)
* fix(mindie): preserve string args without JSON quotes in XML tool call serialization
* fix(mindie): preserve string args without JSON quotes in XML tool call serialization
* test_mindie_provider:format
* Potential fix for pull request finding
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
* fix(mindie): prevent nested tool_call params from leaking into outer args
* fixed by escaping XML entities in _fix_messages and unescaping during parse, with regression tests added.
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
