Function handleLLMStart

packages/core/src/tracing/langchain/index.ts:82–119

(
      llm: unknown,
      prompts: string[],
      runId: string,
      _parentRunId?: string,
      _extraParams?: Record<string, unknown>,
      tags?: string[],
      metadata?: Record<string, unknown>,
      _runName?: string,
    )

    awaitHandlers: true,

    handleLLMStart(
      llm: unknown,
      prompts: string[],
      runId: string,
      _parentRunId?: string,
      _extraParams?: Record<string, unknown>,
      tags?: string[],
      metadata?: Record<string, unknown>,
      _runName?: string,
    ) {
      const invocationParams = getInvocationParams(tags);
      const attributes = extractLLMRequestAttributes(
        llm as LangChainSerialized,
        prompts,
        recordInputs,
        enableTruncation,
        invocationParams,
        metadata,
      );
      const modelName = attributes[GEN_AI_REQUEST_MODEL_ATTRIBUTE];
      const operationName = attributes[GEN_AI_OPERATION_NAME_ATTRIBUTE];

      startSpanManual(
        {
          name: `${operationName} ${modelName}`,
          op: 'gen_ai.chat',
          attributes: {
            ...getAgentNameFromMetadata(metadata),
            ...attributes,
            [SEMANTIC_ATTRIBUTE_SENTRY_OP]: 'gen_ai.chat',
          },
        },
        span => {
          spanMap.set(runId, span);
          return span;
        },
      );
    },

    // Chat Model Start Handler
    handleChatModelStart(