fix(ui): stream tool events live in control chat (#39104)

Land #39104 by @jakepresent.

Co-authored-by: Jake Present <jakepresent@microsoft.com>

ui/src/ui/app-gateway.ts

@@ -258,22 +258,31 @@ function handleTerminalChatEvent(
   host: GatewayHost,
   payload: ChatEventPayload | undefined,
   state: ReturnType<typeof handleChatEvent>,
-) {
+): boolean {
   if (state !== "final" && state !== "error" && state !== "aborted") {
-    return;
+    return false;
   }
-  resetToolStream(host as unknown as Parameters<typeof resetToolStream>[0]);
+  // Check if tool events were seen before resetting (resetToolStream clears toolStreamOrder).
+  const toolHost = host as unknown as Parameters<typeof resetToolStream>[0];
+  const hadToolEvents = toolHost.toolStreamOrder.length > 0;
+  resetToolStream(toolHost);
   void flushChatQueueForEvent(host as unknown as Parameters<typeof flushChatQueueForEvent>[0]);
   const runId = payload?.runId;
-  if (!runId || !host.refreshSessionsAfterChat.has(runId)) {
-    return;
+  if (runId && host.refreshSessionsAfterChat.has(runId)) {
+    host.refreshSessionsAfterChat.delete(runId);
+    if (state === "final") {
+      void loadSessions(host as unknown as OpenClawApp, {
+        activeMinutes: CHAT_SESSIONS_ACTIVE_MINUTES,
+      });
+    }
   }
-  host.refreshSessionsAfterChat.delete(runId);
-  if (state === "final") {
-    void loadSessions(host as unknown as OpenClawApp, {
-      activeMinutes: CHAT_SESSIONS_ACTIVE_MINUTES,
-    });
+  // Reload history when tools were used so the persisted tool results
+  // replace the now-cleared streaming state.
+  if (hadToolEvents && state === "final") {
+    void loadChatHistory(host as unknown as OpenClawApp);
+    return true;
   }
+  return false;
 }
 
 function handleChatGatewayEvent(host: GatewayHost, payload: ChatEventPayload | undefined) {
@@ -284,8 +293,8 @@ function handleChatGatewayEvent(host: GatewayHost, payload: ChatEventPayload | u
     );
   }
   const state = handleChatEvent(host as unknown as OpenClawApp, payload);
-  handleTerminalChatEvent(host, payload, state);
-  if (state === "final" && shouldReloadHistoryForFinalEvent(payload)) {
+  const historyReloaded = handleTerminalChatEvent(host, payload, state);
+  if (state === "final" && !historyReloaded && shouldReloadHistoryForFinalEvent(payload)) {
     void loadChatHistory(host as unknown as OpenClawApp);
   }
 }
@@ -307,6 +316,17 @@ function handleGatewayEventUnsafe(host: GatewayHost, evt: GatewayEventFrame) {
       host as unknown as Parameters<typeof handleAgentEvent>[0],
       evt.payload as AgentEventPayload | undefined,
     );
+    // Reload history after each tool result so the persisted text + tool
+    // output replaces any truncated streaming fragments.
+    const agentPayload = evt.payload as AgentEventPayload | undefined;
+    const toolData = agentPayload?.data;
+    if (
+      agentPayload?.stream === "tool" &&
+      typeof toolData?.phase === "string" &&
+      toolData.phase === "result"
+    ) {
+      void loadChatHistory(host as unknown as OpenClawApp);
+    }
     return;
   }
 

ui/src/ui/app-render.ts

@@ -1029,6 +1029,7 @@ export function renderApp(state: AppViewState) {
                 assistantAvatarUrl: chatAvatarUrl,
                 messages: state.chatMessages,
                 toolMessages: state.chatToolMessages,
+                streamSegments: state.chatStreamSegments,
                 stream: state.chatStream,
                 streamStartedAt: state.chatStreamStartedAt,
                 draft: state.chatMessage,

ui/src/ui/app-tool-stream.node.test.ts

@@ -13,6 +13,9 @@ function createHost(overrides?: Partial<MutableHost>): MutableHost {
   return {
     sessionKey: "main",
     chatRunId: null,
+    chatStream: null,
+    chatStreamStartedAt: null,
+    chatStreamSegments: [],
     toolStreamById: new Map<string, ToolStreamEntry>(),
     toolStreamOrder: [],
     chatToolMessages: [],

ui/src/ui/app-tool-stream.ts

@@ -28,6 +28,9 @@ export type ToolStreamEntry = {
 type ToolStreamHost = {
   sessionKey: string;
   chatRunId: string | null;
+  chatStream: string | null;
+  chatStreamStartedAt: number | null;
+  chatStreamSegments: Array<{ text: string; ts: number }>;
   toolStreamById: Map<string, ToolStreamEntry>;
   toolStreamOrder: string[];
   chatToolMessages: Record<string, unknown>[];
@@ -231,10 +234,14 @@ export function scheduleToolStreamSync(host: ToolStreamHost, force = false) {
 }
 
 export function resetToolStream(host: ToolStreamHost) {
+  if (host.toolStreamSyncTimer != null) {
+    clearTimeout(host.toolStreamSyncTimer);
+    host.toolStreamSyncTimer = null;
+  }
   host.toolStreamById.clear();
   host.toolStreamOrder = [];
   host.chatToolMessages = [];
-  flushToolStreamSync(host);
+  host.chatStreamSegments = [];
 }
 
 export type CompactionStatus = {
@@ -401,11 +408,14 @@ export function handleAgentEvent(host: ToolStreamHost, payload?: AgentEventPaylo
   if (payload.stream !== "tool") {
     return;
   }
-  const accepted = resolveAcceptedSession(host, payload);
-  if (!accepted.accepted) {
+
+  // Filter by session only. Don't check chatRunId because the client sets it
+  // to a client-generated UUID (via generateUUID in sendChatMessage), while
+  // tool events arrive with the server's engine runId — they can never match.
+  const sessionKey = typeof payload.sessionKey === "string" ? payload.sessionKey : undefined;
+  if (sessionKey && sessionKey !== host.sessionKey) {
     return;
   }
-  const sessionKey = accepted.sessionKey;
 
   const data = payload.data ?? {};
   const toolCallId = typeof data.toolCallId === "string" ? data.toolCallId : "";
@@ -425,6 +435,13 @@ export function handleAgentEvent(host: ToolStreamHost, payload?: AgentEventPaylo
   const now = Date.now();
   let entry = host.toolStreamById.get(toolCallId);
   if (!entry) {
+    // Commit any in-progress streaming text as a segment so it renders
+    // above the tool card instead of below it.
+    if (host.chatStream && host.chatStream.trim().length > 0) {
+      host.chatStreamSegments = [...host.chatStreamSegments, { text: host.chatStream, ts: now }];
+      host.chatStream = null;
+      host.chatStreamStartedAt = null;
+    }
     entry = {
       toolCallId,
       runId: payload.runId,

ui/src/ui/app.ts

@@ -144,6 +144,7 @@ export class OpenClawApp extends LitElement {
   @state() chatMessage = "";
   @state() chatMessages: unknown[] = [];
   @state() chatToolMessages: unknown[] = [];
+  @state() chatStreamSegments: Array<{ text: string; ts: number }> = [];
   @state() chatStream: string | null = null;
   @state() chatStreamStartedAt: number | null = null;
   @state() chatRunId: string | null = null;

ui/src/ui/controllers/chat.ts

@@ -1,3 +1,4 @@
+import { resetToolStream } from "../app-tool-stream.ts";
 import { extractText } from "../chat/message-extract.ts";
 import type { GatewayBrowserClient } from "../gateway.ts";
 import type { ChatAttachment } from "../ui-types.ts";
@@ -50,6 +51,18 @@ export type ChatEventPayload = {
   errorMessage?: string;
 };
 
+function maybeResetToolStream(state: ChatState) {
+  const toolHost = state as ChatState & Partial<Parameters<typeof resetToolStream>[0]>;
+  if (
+    toolHost.toolStreamById instanceof Map &&
+    Array.isArray(toolHost.toolStreamOrder) &&
+    Array.isArray(toolHost.chatToolMessages) &&
+    Array.isArray(toolHost.chatStreamSegments)
+  ) {
+    resetToolStream(toolHost as Parameters<typeof resetToolStream>[0]);
+  }
+}
+
 export async function loadChatHistory(state: ChatState) {
   if (!state.client || !state.connected) {
     return;
@@ -67,6 +80,11 @@ export async function loadChatHistory(state: ChatState) {
     const messages = Array.isArray(res.messages) ? res.messages : [];
     state.chatMessages = messages.filter((message) => !isAssistantSilentReply(message));
     state.chatThinkingLevel = res.thinkingLevel ?? null;
+    // Clear all streaming state — history includes tool results and text
+    // inline, so keeping streaming artifacts would cause duplicates.
+    maybeResetToolStream(state);
+    state.chatStream = null;
+    state.chatStreamStartedAt = null;
   } catch (err) {
     state.lastError = String(err);
   } finally {

ui/src/ui/gateway.ts

@@ -241,7 +241,7 @@ export class GatewayBrowserClient {
       role,
       scopes,
       device,
-      caps: [],
+      caps: ["tool-events"],
       auth,
       userAgent: navigator.userAgent,
       locale: navigator.language,

ui/src/ui/views/chat.ts

@@ -43,6 +43,7 @@ export type ChatProps = {
   fallbackStatus?: FallbackIndicatorStatus | null;
   messages: unknown[];
   toolMessages: unknown[];
+  streamSegments: Array<{ text: string; ts: number }>;
   stream: string | null;
   streamStartedAt: number | null;
   assistantAvatarUrl?: string | null;
@@ -566,8 +567,21 @@ function buildChatItems(props: ChatProps): Array<ChatItem | MessageGroup> {
       message: msg,
     });
   }
-  if (props.showThinking) {
-    for (let i = 0; i < tools.length; i++) {
+  // Interleave stream segments and tool cards in order. Each segment
+  // contains text that was streaming before the corresponding tool started.
+  // This ensures correct visual ordering: text → tool → text → tool → ...
+  const segments = props.streamSegments ?? [];
+  const maxLen = Math.max(segments.length, tools.length);
+  for (let i = 0; i < maxLen; i++) {
+    if (i < segments.length && segments[i].text.trim().length > 0) {
+      items.push({
+        kind: "stream" as const,
+        key: `stream-seg:${props.sessionKey}:${i}`,
+        text: segments[i].text,
+        startedAt: segments[i].ts,
+      });
+    }
+    if (i < tools.length) {
       items.push({
         kind: "message",
         key: messageKey(tools[i], i + history.length),