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Fireworks integration lacks parsing of the X-LangSmith-Gateway-Metadata header on successful responses when using LANGSMITH_GATEWAY, causing missing gateway info and incorrect model/provider in traces.
ChatFireworks does not parse the X-LangSmith-Gateway-Metadata header on successful responses when routed through the LangSmith LLM Gateway, unlike ChatOpenAI and ChatAnthropic. This causes traces to miss gateway info such as the actually resolved model and provider, leading to incorrect cost tracking and inconsistent behavior across integrations.
ChatFireworks does not capture the X-LangSmith-Gateway-Metadata header from successful gateway-routed responses, causing missing or incorrect model/provider information in LangSmith traces. This fix adds gateway metadata capture conditioned on the lsv2_ API key prefix, mirroring OpenAI and Anthropic integrations.