Method emitToolCallDeltaIfPresent

src/node/services/streamManager.ts:887–923

* Extracts usage and duration metadata from stream result. * * Usage is only available after stream completes naturally. * On abort, the usage promise may hang - we use a timeout to return quickly.

(
    workspaceId: WorkspaceId,
    streamInfo: WorkspaceStreamInfo,
    part: unknown
  )

   * On abort, the usage promise may hang - we use a timeout to return quickly.
   */
  private async emitToolCallDeltaIfPresent(
    workspaceId: WorkspaceId,
    streamInfo: WorkspaceStreamInfo,
    part: unknown
  ): Promise<boolean> {
    const maybeDelta = part as { type?: string } | undefined;
    if (maybeDelta?.type !== "tool-call-delta") {
      return false;
    }

    const toolDelta = part as {
      toolCallId: string;
      toolName: string;
      argsTextDelta: string;
    };

    const deltaText = String(toolDelta.argsTextDelta ?? "");
    if (deltaText.length === 0) {
      return true;
    }

    const tokens = await this.tokenTracker.countTokens(deltaText);
    const timestamp = Date.now();

    this.emit("tool-call-delta", {
      type: "tool-call-delta",
      workspaceId: workspaceId as string,
      messageId: streamInfo.messageId,
      toolCallId: toolDelta.toolCallId,
      toolName: toolDelta.toolName,
      delta: toolDelta.argsTextDelta,
      tokens,
      timestamp,
    });

    return true;
  }

  private async getStreamMetadata(
    streamInfo: WorkspaceStreamInfo,