Method buildAutoCompactionRequest

src/node/services/agentSession.ts:3252–3323

(params: {
    followUpContent: CompactionFollowUpRequest;
    baseOptions: SendMessageOptions;
    reason: "on-send" | "mid-stream";
  })

  }

  private buildAutoCompactionRequest(params: {
    followUpContent: CompactionFollowUpRequest;
    baseOptions: SendMessageOptions;
    reason: "on-send" | "mid-stream";
  }): {
    messageText: string;
    metadata: MuxMessageMetadata;
    sendOptions: SendMessageOptions;
    agentInitiated: boolean;
  } {
    // Callers pass the stream model in baseOptions.model; avoid ambient session state
    // here because the current stream is cleared before compaction and could go stale.
    const compactionModel = this.getPreferredCompactionModel() ?? params.baseOptions.model;
    assert(
      typeof compactionModel === "string" && compactionModel.trim().length > 0,
      "auto-compaction requires a non-empty model"
    );

    const sendOptions: SendMessageOptions = {
      ...params.baseOptions,
      agentId: "compact",
      skipAiSettingsPersistence: true,
      model: compactionModel,
      thinkingLevel: enforceThinkingPolicy(
        compactionModel,
        params.baseOptions.thinkingLevel ?? "off"
      ),
      maxOutputTokens: undefined,
      toolPolicy: [{ regex_match: ".*", action: "disable" }],
    };

    const followUpContent: CompactionFollowUpRequest =
      params.reason === "mid-stream"
        ? {
            ...params.followUpContent,
            dispatchOptions: {
              ...params.followUpContent.dispatchOptions,
              // Mid-stream compaction resumes with a generated "Continue" sentinel; unlike
              // on-send compaction, it is not the user's original prompt completing.
              source: "internal-resume",
            },
          }
        : params.followUpContent;

    const messageText = buildCompactionMessageText({ followUpContent });

    const metadata: MuxMessageMetadata = {
      type: "compaction-request",
      rawCommand: "/compact",
      commandPrefix: "/compact",
      parsed: {
        model: sendOptions.model,
        followUpContent,
      },
      requestedModel: sendOptions.model,
      source: "auto-compaction",
      displayStatus: {
        emoji: "🔄",