diff --git a/tauri/src/main.ts b/tauri/src/main.ts
index 26dc6df..1bbcd5f 100644
--- a/tauri/src/main.ts
+++ b/tauri/src/main.ts
@@ -4,6 +4,7 @@ import {
   type ConversationItem,
   type Envelope,
   type JsonObject,
+  parseEnvelopeJSON,
 } from "./protocol";
 import { ConversationStore } from "./runtime/conversation-store";
 import { InteractionKernel } from "./runtime/interaction-kernel";
@@ -25,6 +26,7 @@ const DEFAULT_API = "http://127.0.0.1:8090";
 let session: Session = { api: localStorage.getItem("lineup.api") || DEFAULT_API, uid: "", agentUID: "agent_hermes_main", channelID: "agent_default_channel", channelType: 2, lastSeq: 0, active: false };
 let transport: TransportAdapter | undefined;
 let polling = false;
+let flushingOutbox = false;
 const interactionKernel = new InteractionKernel();
 const conversationStore = new ConversationStore(localStorage);
 
@@ -98,13 +100,19 @@ const rendererContext = new TrustedDOMRendererContext(messages, presence, {
   submit(callID, submission) {
     const transition = interactionKernel.submitToolCall(callID, new Date().toISOString(), submission);
     conversationStore.replaceToolCalls(interactionKernel.snapshot().tool_calls);
-    if (transition.disposition === "accepted") conversationStore.clearToolDraft(callID);
+    if (transition.disposition === "accepted") {
+      conversationStore.clearToolDraft(callID);
+      queueToolAction("tool-result", callID, { call_id: callID, status: "completed", result: submission });
+    }
     return transition.disposition === "accepted";
   },
   cancel(callID, reason) {
     const transition = interactionKernel.cancelToolCall(callID, reason, new Date().toISOString());
     conversationStore.replaceToolCalls(interactionKernel.snapshot().tool_calls);
-    if (transition.disposition === "accepted") conversationStore.clearToolDraft(callID);
+    if (transition.disposition === "accepted") {
+      conversationStore.clearToolDraft(callID);
+      queueToolAction("tool-cancel", callID, { call_id: callID, reason });
+    }
     return transition.disposition === "accepted";
   },
   expire(callID) {
@@ -145,6 +153,64 @@ function currentConversationKey(): string {
   return `${session.uid}:${session.channelType}:${session.channelID}`;
 }
 
+function queueToolAction(kind: "tool-result" | "tool-cancel", callID: string, payload: JsonObject): void {
+  if (!session.uid) {
+    rendererContext.renderSystemMessage("交互结果已保留，将在下次登录后发送。");
+    return;
+  }
+  const createdAt = new Date().toISOString();
+  const localID = newLocalID("tool");
+  const type = kind === "tool-result" ? "lineup.v1.tool.result" : "lineup.v1.tool.cancel";
+  const envelope = makeProtocolEvent(
+    type, payload, currentConversationKey(),
+    { kind: "human", id: session.uid }, { kind: "agent", id: session.agentUID },
+  );
+  try {
+    // Durable enqueue precedes the HTTP request: a reload or transient
+    // network failure cannot turn one accepted UI action into an untracked
+    // second submission.
+    conversationStore.enqueueToolAction(localID, kind, JSON.stringify(envelope), createdAt);
+  } catch (reason) {
+    rendererContext.renderSystemMessage(storageFailureMessage(reason));
+    return;
+  }
+  void flushOutbox();
+}
+
+async function flushOutbox(): Promise<void> {
+  if (flushingOutbox || !session.active || !transport || !session.uid) return;
+  flushingOutbox = true;
+  try {
+    for (const entry of conversationStore.snapshot().outbox) {
+      try {
+        const sequence = await transport.sendText({
+          from_uid: session.uid,
+          channel_id: session.channelID,
+          channel_type: session.channelType,
+          payload: entry.payload,
+        });
+        if (entry.kind === "text") {
+          if (sequence) conversationStore.markSubmitted(entry.local_id, sequence, new Date().toISOString());
+          rendererContext.updateUserDelivery(entry.local_id, { status: "submitted", updated_at: new Date().toISOString(), ...(sequence ? { transport_id: String(sequence) } : {}) });
+        } else {
+          conversationStore.acknowledgeOutbox(entry.local_id);
+        }
+      } catch (reason) {
+        if (entry.kind === "text") {
+          const message = reason instanceof Error ? reason.message : "发送失败";
+          conversationStore.markFailed(entry.local_id, message, new Date().toISOString());
+          rendererContext.updateUserDelivery(entry.local_id, { status: "failed", updated_at: new Date().toISOString(), error: message, retryable: true });
+        }
+        // Keep this and later entries durable; the next sync/login cycle
+        // retries in original order.
+        return;
+      }
+    }
+  } finally {
+    flushingOutbox = false;
+  }
+}
+
 function decodeBase64(value: string): string {
   try { return decodeURIComponent([...atob(value)].map(c => `%${c.charCodeAt(0).toString(16).padStart(2, "0")}`).join("")); } catch { return value; }
 }
@@ -182,6 +248,12 @@ async function syncLoop(): Promise<void> {
           conversationStore.advanceCursor(message.message_seq);
           const payload = decodeBase64(message.payload);
           if (message.from_uid === session.uid) {
+            const ownEnvelope = parseEnvelopeJSON(payload);
+            if (ownEnvelope.ok && (ownEnvelope.envelope.type === "lineup.v1.tool.result" || ownEnvelope.envelope.type === "lineup.v1.tool.cancel")) {
+              // Tool action echoes advance the inclusive cursor but are never
+              // rendered as raw JSON user messages or replayed as a new action.
+              continue;
+            }
             const restored = conversationStore.recordSyncedUserText(message.message_seq, payload, new Date().toISOString());
             if (restored) renderIncoming(restored.item);
           } else {
@@ -250,7 +322,7 @@ $<HTMLFormElement>("#login-form").addEventListener("submit", async event => {
     messages.replaceChildren(); rendererContext.reset();
     loginView.hidden = true; chatView.hidden = false;
     for (const stored of snapshot.items) renderIncoming(stored.item);
-    rendererContext.renderSystemMessage("已进入与 AI Agent 的对话"); rendererContext.setPresence("正在同步消息…"); void syncLoop();
+    rendererContext.renderSystemMessage("已进入与 AI Agent 的对话"); rendererContext.setPresence("正在同步消息…"); void flushOutbox(); void syncLoop();
   } catch (reason) { error.textContent = loginFailureMessage(reason); }
   finally { submit.disabled = false; submit.textContent = "进入 LineUp"; }
 });
diff --git a/tauri/src/runtime/conversation-store.test.ts b/tauri/src/runtime/conversation-store.test.ts
index 88b1334..b688ac6 100644
--- a/tauri/src/runtime/conversation-store.test.ts
+++ b/tauri/src/runtime/conversation-store.test.ts
@@ -55,7 +55,7 @@ describe("ConversationStore", () => {
     const snapshot = reopened.open(conversationID);
 
     expect(snapshot.cursor).toBe(0);
-    expect(snapshot.outbox).toEqual([expect.objectContaining({ local_id: "local_002", payload: "persist me" })]);
+    expect(snapshot.outbox).toEqual([expect.objectContaining({ local_id: "local_002", kind: "text", payload: "persist me" })]);
     expect(snapshot.items).toEqual([expect.objectContaining({
       local_id: "local_002",
       item: expect.objectContaining({ kind: "user-message", text: "persist me" }),
@@ -110,4 +110,32 @@ describe("ConversationStore", () => {
 
     expect(new ConversationStore(storage).open(conversationID).tasks).toEqual([expect.objectContaining({ operation_id: "task_store_001", percent: 70 })]);
   });
+
+  it("durably queues a tool result without creating a user-message history item", () => {
+    const storage = new MemoryStorage();
+    const first = new ConversationStore(storage);
+    first.open(conversationID);
+    first.enqueueToolAction("tool_001", "tool-result", '{"type":"lineup.v1.tool.result"}', createdAt);
+
+    const reopened = new ConversationStore(storage).open(conversationID);
+    expect(reopened.items).toEqual([]);
+    expect(reopened.outbox).toEqual([{
+      local_id: "tool_001", kind: "tool-result", payload: '{"type":"lineup.v1.tool.result"}', created_at: createdAt,
+    }]);
+
+    const current = new ConversationStore(storage);
+    current.open(conversationID);
+    current.acknowledgeOutbox("tool_001");
+    expect(current.snapshot().outbox).toEqual([]);
+  });
+
+  it("upgrades v5 plaintext outbox entries to typed text entries", () => {
+    const storage = new MemoryStorage();
+    storage.setItem("lineup.conversation.v1:user_test:2:agent_channel", JSON.stringify({
+      version: 5, cursor: 8, items: [], outbox: [{ local_id: "legacy_001", payload: "hello", created_at: createdAt }], tool_calls: [], tool_drafts: {}, tasks: [],
+    }));
+    expect(new ConversationStore(storage).open(conversationID).outbox).toEqual([{
+      local_id: "legacy_001", kind: "text", payload: "hello", created_at: createdAt,
+    }]);
+  });
 });
diff --git a/tauri/src/runtime/conversation-store.ts b/tauri/src/runtime/conversation-store.ts
index dfb3476..aeab396 100644
--- a/tauri/src/runtime/conversation-store.ts
+++ b/tauri/src/runtime/conversation-store.ts
@@ -11,6 +11,7 @@ export type StoredConversationItem = {
 
 export type OutboxEntry = {
   local_id: string;
+  kind: "text" | "tool-result" | "tool-cancel";
   payload: string;
   created_at: string;
 };
@@ -26,7 +27,7 @@ export type ConversationSnapshot = {
 };
 
 type PersistedConversation = {
-  version: 5;
+  version: 6;
   cursor: number;
   items: StoredConversationItem[];
   outbox: OutboxEntry[];
@@ -109,21 +110,29 @@ export class ConversationStore {
       item: { kind: "user-message", id: localID, text, delivery },
     };
     this.state.items.push(stored);
-    this.state.outbox.push({ local_id: localID, payload: text, created_at: createdAt });
+    this.state.outbox.push({ local_id: localID, kind: "text", payload: text, created_at: createdAt });
     this.persist();
     return { ...stored };
   }
 
+  /** Queues a standard interaction response before any network attempt. */
+  public enqueueToolAction(localID: string, kind: "tool-result" | "tool-cancel", payload: string, createdAt: string): void {
+    if (this.state.outbox.some(entry => entry.local_id === localID)) return;
+    this.state.outbox.push({ local_id: localID, kind, payload, created_at: createdAt });
+    this.persist();
+  }
+
   /** Transport acknowledgement gives the local message its durable IM sequence. */
   public markSubmitted(localID: string, messageSeq: number, updatedAt: string): void {
     const stored = this.state.items.find(item => item.local_id === localID);
-    if (!stored || stored.item.kind !== "user-message") return;
-    stored.message_seq = messageSeq;
-    stored.item = {
-      ...stored.item,
-      delivery: { status: "submitted", updated_at: updatedAt, transport_id: String(messageSeq) },
-    };
-    this.state.outbox = this.state.outbox.filter(entry => entry.local_id !== localID);
+    if (stored?.item.kind === "user-message") {
+      stored.message_seq = messageSeq;
+      stored.item = {
+        ...stored.item,
+        delivery: { status: "submitted", updated_at: updatedAt, transport_id: String(messageSeq) },
+      };
+    }
+    this.acknowledgeOutbox(localID);
     // A send acknowledgement is not a sync acknowledgement.  The legacy
     // `/messages/sync` cursor is inclusive, so advancing it here would make a
     // refresh start at `messageSeq + 1` and permanently skip this user's echo.
@@ -132,6 +141,13 @@ export class ConversationStore {
     this.persist();
   }
 
+  /** Removes a delivered non-text action without creating a chat bubble. */
+  public acknowledgeOutbox(localID: string): void {
+    const before = this.state.outbox.length;
+    this.state.outbox = this.state.outbox.filter(entry => entry.local_id !== localID);
+    if (this.state.outbox.length !== before) this.persist();
+  }
+
   public markFailed(localID: string, error: string, updatedAt: string): void {
     const stored = this.state.items.find(item => item.local_id === localID);
     if (!stored || stored.item.kind !== "user-message") return;
@@ -198,31 +214,31 @@ export class ConversationStore {
       const parsed: unknown = JSON.parse(this.storage.getItem(this.key(conversationID)) ?? "null");
       if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) return emptyConversation();
       const candidate = parsed as { version?: unknown; cursor?: unknown; items?: unknown; outbox?: unknown; tool_calls?: unknown; tool_drafts?: unknown; tasks?: unknown };
-      if ((candidate.version !== 1 && candidate.version !== 2 && candidate.version !== 3 && candidate.version !== 4 && candidate.version !== 5) || !Array.isArray(candidate.items) || !Array.isArray(candidate.outbox) || typeof candidate.cursor !== "number") {
+      if ((candidate.version !== 1 && candidate.version !== 2 && candidate.version !== 3 && candidate.version !== 4 && candidate.version !== 5 && candidate.version !== 6) || !Array.isArray(candidate.items) || !Array.isArray(candidate.outbox) || typeof candidate.cursor !== "number") {
         return emptyConversation();
       }
 
-      if (candidate.version !== 5) {
+      if (candidate.version !== 6) {
         // v1 advanced its cursor from a send acknowledgement.  Some browsers
         // had already been upgraded to v2 before that correction, retaining a
         // high cursor with holes for their own echoes.  Preserve every valid
         // local item but replay the server history once to repair those holes;
         // the next persist upgrades this record to v5.
         return {
-          version: 5,
-          cursor: candidate.version === 4 ? Math.max(0, candidate.cursor) : 0,
+          version: 6,
+          cursor: candidate.version === 4 || candidate.version === 5 ? Math.max(0, candidate.cursor) : 0,
           items: candidate.items as StoredConversationItem[],
-          outbox: candidate.outbox as OutboxEntry[],
-          tool_calls: candidate.version === 4 && Array.isArray(candidate.tool_calls) ? candidate.tool_calls as ToolCallRecord[] : [],
-          tool_drafts: candidate.version === 4 && isDraftMap(candidate.tool_drafts) ? candidate.tool_drafts : {},
-          tasks: [],
+          outbox: normalizeOutbox(candidate.outbox),
+          tool_calls: (candidate.version === 4 || candidate.version === 5) && Array.isArray(candidate.tool_calls) ? candidate.tool_calls as ToolCallRecord[] : [],
+          tool_drafts: (candidate.version === 4 || candidate.version === 5) && isDraftMap(candidate.tool_drafts) ? candidate.tool_drafts : {},
+          tasks: candidate.version === 5 && Array.isArray(candidate.tasks) ? candidate.tasks as TaskRecord[] : [],
         };
       }
       return {
-        version: 5,
+        version: 6,
         cursor: Math.max(0, candidate.cursor),
         items: candidate.items as StoredConversationItem[],
-        outbox: candidate.outbox as OutboxEntry[],
+        outbox: normalizeOutbox(candidate.outbox),
         tool_calls: Array.isArray(candidate.tool_calls) ? candidate.tool_calls as ToolCallRecord[] : [],
         tool_drafts: isDraftMap(candidate.tool_drafts) ? candidate.tool_drafts : {},
         tasks: Array.isArray(candidate.tasks) ? candidate.tasks as TaskRecord[] : [],
@@ -247,7 +263,18 @@ export class ConversationStore {
 }
 
 function emptyConversation(): PersistedConversation {
-  return { version: 5, cursor: 0, items: [], outbox: [], tool_calls: [], tool_drafts: {}, tasks: [] };
+  return { version: 6, cursor: 0, items: [], outbox: [], tool_calls: [], tool_drafts: {}, tasks: [] };
+}
+
+function normalizeOutbox(value: unknown): OutboxEntry[] {
+  if (!Array.isArray(value)) return [];
+  return value.flatMap(entry => {
+    if (!entry || typeof entry !== "object" || Array.isArray(entry)) return [];
+    const candidate = entry as Partial<OutboxEntry>;
+    if (typeof candidate.local_id !== "string" || typeof candidate.payload !== "string" || typeof candidate.created_at !== "string") return [];
+    const kind = candidate.kind === "tool-result" || candidate.kind === "tool-cancel" ? candidate.kind : "text";
+    return [{ local_id: candidate.local_id, kind, payload: candidate.payload, created_at: candidate.created_at }];
+  });
 }
 
 function isDraftMap(value: unknown): value is Record<string, JsonObject> {