Revert "feat(umi): add subagent id to stream delta and subagent snapshot to WS event"

This reverts commit bda874b3cd.

src/agent/subagents/manager.ts

@@ -12,7 +12,6 @@ import { createInterface } from "node:readline";
 import { buildChatUrl } from "../../cli/helpers/appUrls";
 import {
   addToolCall,
-  emitStreamEvent,
   updateSubagent,
 } from "../../cli/helpers/subagentState.js";
 import {
@@ -395,10 +394,6 @@ function processStreamEvent(
       case "message":
         if (event.message_type === "approval_request_message") {
           handleApprovalRequestEvent(event, state);
-        } else {
-          // Forward non-approval message events for WS streaming to the web UI.
-          // Approval requests are internal to the subagent's permission flow.
-          emitStreamEvent(subagentId, event);
         }
         break;
 

src/cli/helpers/subagentState.ts

@@ -365,54 +365,3 @@ export function getSnapshot(): {
 } {
   return cachedSnapshot;
 }
-
-// ============================================================================
-// Stream Event Forwarding
-// ============================================================================
-
-/**
- * A raw message-type event from the subagent's stdout (headless format).
- * Shape: { type: "message", message_type: string, ...LettaStreamingResponse fields }
- */
-export interface SubagentStreamEvent {
-  type: "message";
-  message_type: string;
-  [key: string]: unknown;
-}
-
-/**
- * Callback for forwarding raw subagent stream events to the WS layer.
- * The event is the parsed JSON line from the subagent's stdout.
- */
-export type SubagentStreamEventListener = (
-  subagentId: string,
-  event: SubagentStreamEvent,
-) => void;
-
-const streamEventListeners = new Set<SubagentStreamEventListener>();
-
-/**
- * Subscribe to raw subagent stream events (for WS forwarding).
- * Returns an unsubscribe function.
- */
-export function subscribeToStreamEvents(
-  listener: SubagentStreamEventListener,
-): () => void {
-  streamEventListeners.add(listener);
-  return () => {
-    streamEventListeners.delete(listener);
-  };
-}
-
-/**
- * Emit a raw stream event from a subagent. Called from processStreamEvent
- * in manager.ts for message-type events that should be forwarded to the web UI.
- */
-export function emitStreamEvent(
-  subagentId: string,
-  event: SubagentStreamEvent,
-): void {
-  for (const listener of streamEventListeners) {
-    listener(subagentId, event);
-  }
-}

src/types/protocol_v2.ts

@@ -279,39 +279,6 @@ export type StreamDelta =
 export interface StreamDeltaMessage extends RuntimeEnvelope {
   type: "stream_delta";
   delta: StreamDelta;
-  subagent_id?: string;
-}
-
-/**
- * Subagent state snapshot.
- * Emitted via `update_subagent_state` on every subagent mutation.
- */
-export interface SubagentSnapshotToolCall {
-  id: string;
-  name: string;
-  args: string;
-}
-
-export interface SubagentSnapshot {
-  subagent_id: string;
-  subagent_type: string;
-  description: string;
-  status: "pending" | "running" | "completed" | "error";
-  agent_url: string | null;
-  model?: string;
-  is_background?: boolean;
-  silent?: boolean;
-  tool_call_id?: string;
-  start_time: number;
-  tool_calls: SubagentSnapshotToolCall[];
-  total_tokens: number;
-  duration_ms: number;
-  error?: string;
-}
-
-export interface SubagentStateUpdateMessage extends RuntimeEnvelope {
-  type: "update_subagent_state";
-  subagents: SubagentSnapshot[];
 }
 
 export interface ApprovalResponseAllowDecision {
@@ -430,7 +397,6 @@ export type WsProtocolMessage =
   | DeviceStatusUpdateMessage
   | LoopStatusUpdateMessage
   | QueueUpdateMessage
-  | StreamDeltaMessage
+  | StreamDeltaMessage;
-  | SubagentStateUpdateMessage;
 
 export type { StopReasonType };

src/websocket/listener/client.ts

@@ -10,10 +10,6 @@ import type { ApprovalCreate } from "@letta-ai/letta-client/resources/agents/mes
 import WebSocket from "ws";
 import { getClient } from "../../agent/client";
 import { generatePlanFilePath } from "../../cli/helpers/planName";
-import {
-  subscribe as subscribeToSubagentState,
-  subscribeToStreamEvents as subscribeToSubagentStreamEvents,
-} from "../../cli/helpers/subagentState";
 import { INTERRUPTED_BY_USER } from "../../constants";
 import { type DequeuedBatch, QueueRuntime } from "../../queue/queueRuntime";
 import { createSharedReminderState } from "../../reminders/state";
@@ -75,8 +71,6 @@ import {
   emitLoopStatusUpdate,
   emitRetryDelta,
   emitStateSync,
-  emitStreamDelta,
-  emitSubagentStateIfOpen,
   scheduleQueueEmit,
   setLoopStatus,
 } from "./protocol-outbound";
@@ -711,32 +705,6 @@ async function connectWithRetry(
       }
     }
 
-    // Subscribe to subagent state changes and emit snapshots over WS.
-    // Store the unsubscribe function on the runtime for cleanup on close.
-    runtime._unsubscribeSubagentState?.();
-    runtime._unsubscribeSubagentState = subscribeToSubagentState(() => {
-      emitSubagentStateIfOpen(runtime);
-    });
-
-    // Subscribe to subagent stream events and forward as tagged stream_delta.
-    // Events are raw JSON lines from the subagent's stdout (headless format):
-    //   { type: "message", message_type: "tool_call_message", ...LettaStreamingResponse fields }
-    // These are already MessageDelta-shaped (type:"message" + LettaStreamingResponse).
-    runtime._unsubscribeSubagentStreamEvents?.();
-    runtime._unsubscribeSubagentStreamEvents =
-      subscribeToSubagentStreamEvents((subagentId, event) => {
-        if (socket.readyState !== WebSocket.OPEN) return;
-        // The event has { type: "message", message_type, ...LettaStreamingResponse }
-        // plus extra headless fields (session_id, uuid) that pass through harmlessly.
-        emitStreamDelta(
-          socket,
-          runtime,
-          event as unknown as import("../../types/protocol_v2").StreamDelta,
-          undefined, // scope: falls back to listener's default agent/conversation
-          subagentId,
-        );
-      });
-
     runtime.heartbeatInterval = setInterval(() => {
       if (socket.readyState === WebSocket.OPEN) {
         socket.send(JSON.stringify({ type: "ping" }));
@@ -1075,10 +1043,6 @@ async function connectWithRetry(
 
     clearRuntimeTimers(runtime);
     killAllTerminals();
-    runtime._unsubscribeSubagentState?.();
-    runtime._unsubscribeSubagentState = undefined;
-    runtime._unsubscribeSubagentStreamEvents?.();
-    runtime._unsubscribeSubagentStreamEvents = undefined;
     runtime.socket = null;
     for (const conversationRuntime of runtime.conversationRuntimes.values()) {
       rejectPendingApprovalResolvers(

src/websocket/listener/protocol-outbound.ts

@@ -18,11 +18,8 @@ import type {
   StopReasonType,
   StreamDelta,
   StreamDeltaMessage,
-  SubagentSnapshot,
-  SubagentStateUpdateMessage,
   WsProtocolMessage,
 } from "../../types/protocol_v2";
-import { getSubagents } from "../../cli/helpers/subagentState";
 import { SYSTEM_REMINDER_RE } from "./constants";
 import { getConversationWorkingDirectory } from "./cwd";
 import { getConversationPermissionModeState } from "./permissionMode";
@@ -453,63 +450,6 @@ export function emitStateSync(
   emitDeviceStatusUpdate(socket, runtime, scope);
   emitLoopStatusUpdate(socket, runtime, scope);
   emitQueueUpdate(socket, runtime, scope);
-  emitSubagentStateUpdate(socket, runtime, scope);
-}
-
-// ─────────────────────────────────────────────
-// Subagent state
-// ─────────────────────────────────────────────
-
-export function buildSubagentSnapshot(): SubagentSnapshot[] {
-  return getSubagents()
-    .filter((a) => !a.silent)
-    .map((a) => ({
-      subagent_id: a.id,
-      subagent_type: a.type,
-      description: a.description,
-      status: a.status,
-      agent_url: a.agentURL,
-      model: a.model,
-      is_background: a.isBackground,
-      silent: a.silent,
-      tool_call_id: a.toolCallId,
-      start_time: a.startTime,
-      tool_calls: a.toolCalls,
-      total_tokens: a.totalTokens,
-      duration_ms: a.durationMs,
-      error: a.error,
-    }));
-}
-
-export function emitSubagentStateUpdate(
-  socket: WebSocket,
-  runtime: RuntimeCarrier,
-  scope?: {
-    agent_id?: string | null;
-    conversation_id?: string | null;
-  },
-): void {
-  const message: Omit<
-    SubagentStateUpdateMessage,
-    "runtime" | "event_seq" | "emitted_at" | "idempotency_key"
-  > = {
-    type: "update_subagent_state",
-    subagents: buildSubagentSnapshot(),
-  };
-  emitProtocolV2Message(socket, runtime, message, scope);
-}
-
-export function emitSubagentStateIfOpen(
-  runtime: RuntimeCarrier,
-  scope?: {
-    agent_id?: string | null;
-    conversation_id?: string | null;
-  },
-): void {
-  const listener = getListenerRuntime(runtime);
-  if (listener?.socket?.readyState === WebSocket.OPEN) {
-    emitSubagentStateUpdate(listener.socket, runtime, scope);
-  }
 }
 
 export function scheduleQueueEmit(
@@ -665,7 +605,6 @@ export function emitStreamDelta(
     agent_id?: string | null;
     conversation_id?: string | null;
   },
-  subagentId?: string,
 ): void {
   const message: Omit<
     StreamDeltaMessage,
@@ -673,7 +612,6 @@ export function emitStreamDelta(
   > = {
     type: "stream_delta",
     delta,
-    ...(subagentId ? { subagent_id: subagentId } : {}),
   };
   emitProtocolV2Message(socket, runtime, message, scope);
 }

src/websocket/listener/types.ts

@@ -159,10 +159,6 @@ export type ListenerRuntime = {
   conversationRuntimes: Map<string, ConversationRuntime>;
   approvalRuntimeKeyByRequestId: Map<string, string>;
   lastEmittedStatus: "idle" | "receiving" | "processing" | null;
-  /** Unsubscribe from subagent state store (set on socket open, cleared on close). */
-  _unsubscribeSubagentState?: (() => void) | undefined;
-  /** Unsubscribe from subagent stream events (set on socket open, cleared on close). */
-  _unsubscribeSubagentStreamEvents?: (() => void) | undefined;
 };
 
 export interface InterruptPopulateInput {