Function handleToolEnd

packages/core/src/tracing/langchain/index.ts:321–335

(output: unknown, runId: string)

    // Tool End Handler
    handleToolEnd(output: unknown, runId: string) {
      const span = spanMap.get(runId);
      if (span?.isRecording()) {
        if (recordOutputs) {
          // LangChain tools may return ToolMessage objects — extract the content
          const outputObj = output as Record<string, unknown> | undefined;
          const content =
            outputObj && typeof outputObj === 'object' && 'content' in outputObj ? outputObj.content : output;
          span.setAttributes({
            [GEN_AI_TOOL_OUTPUT_ATTRIBUTE]: typeof content === 'string' ? content : JSON.stringify(content),
          });
        }
        exitSpan(runId);
      }
    },

    // Tool Error Handler
    handleToolError(error: Error, runId: string) {