Function summarizeToolResultForLog

src/node/services/streamManager.ts:329–386

(output: unknown)

const ORPHAN_TOOL_RESULT_MAX_KEYS = 8;

function summarizeToolResultForLog(output: unknown): Record<string, unknown> {
  if (output === null) {
    return { outputType: "null" };
  }

  if (typeof output === "string") {
    return {
      outputType: "string",
      outputLength: output.length,
      outputPreview: output.slice(0, ORPHAN_TOOL_RESULT_PREVIEW_CHARS),
    };
  }

  if (typeof output === "number" || typeof output === "boolean") {
    return {
      outputType: typeof output,
      outputPreview: String(output),
    };
  }

  if (Array.isArray(output)) {
    return {
      outputType: "array",
      outputLength: output.length,
      firstItemType:
        output.length > 0 && output[0] !== null
          ? typeof output[0]
          : output.length > 0
            ? "null"
            : undefined,
    };
  }

  if (typeof output === "object") {
    const outputRecord = output as Record<string, unknown>;
    const keys = Object.keys(outputRecord);
    const summary: Record<string, unknown> = {
      outputType: "object",
      outputKeyCount: keys.length,
      outputKeys: keys.slice(0, ORPHAN_TOOL_RESULT_MAX_KEYS),
    };

    if (typeof outputRecord.type === "string") {
      summary.outputFormat = outputRecord.type;
    }

    if (Array.isArray(outputRecord.value)) {
      summary.outputValueLength = outputRecord.value.length;
    }

    return summary;
  }

  return {
    outputType: typeof output,
    outputPreview: JSON.stringify(output),
  };
}