优化美术 Agent 长等待提示与超时处理

将 120 秒硬超时改为请求存活时的耐心等待提示。
收口 provider 安全上限、有限重试和明确失败错误。
补齐等待互斥、计时清理、前后端测试及契约文档。

docs/project-memory/shared-memory/pitfalls.md

@@ -3234,6 +3234,14 @@
 - 验证：runner 回归测试必须同时覆盖“待确认工具只调用一次 LLM 并成功结束”和“普通连续工具仍会触发 max-turn 门禁”。
 - 关联：`server-rs/crates/platform-editor-agent/src/framework/run.rs`、`server-rs/crates/platform-editor-agent/src/framework/tool.rs`、`server-rs/crates/platform-editor-agent/src/agent/tools/`。
 
+## 画布 Agent 的规划请求不能关闭瞬时失败重试
+
+- 现象：美术 Agent 对话返回红色错误气泡 `completion error: LLM 请求超时，累计尝试 1 次`；HTTP 本身仍返回 200，前端 20 分钟 transport timeout 没有触发。
+- 原因：规划请求虽然有 Agent 专用单次 timeout，但 `editor_agent_llm_client` 把 `max_retries` 硬编码为 0；VectorEngine `gpt-5.4-mini` 的偶发长尾、连接超时或可重试上游状态会在第一次失败后直接持久化成 system error。framework 的英文 `completion error` 前缀也被原样暴露给用户。
+- 处理：120 秒改为前端软提示阈值：POST 仍 pending 时显示不入库的“仍在处理中，请耐心等待”；provider 明确断开/失败才写正式错误。专用 provider 单 attempt 使用 8 分钟 hard timeout，请求发起阶段读取 `GENARRATIVE_LLM_MAX_RETRIES`，但画布 Agent 最多重试 1 次且重试退避最多 60 秒，保证理论上限小于前端 20 分钟 transport timeout；响应头后的体读取/解析错误按明确失败收口。规划错误对用户统一为中文。重试发生在任何生成工具执行前，不会重复提交生成任务或扣费，不要通过提高前端 timeout 或 runner `max_turns` 掩盖 provider 重试缺失。
+- 验证：`platform-editor-agent` 测试锁定 8 分钟 hard timeout 与中文错误；前端 fake timer 用例锁定 120 秒前只显示思考动画、到点后显示耐心等待、成功/失败后移除；`api-server` AppState 测试锁定专用 client 透传 retry 次数。运行态排障按同一 request id 对齐 `platform_llm` failure stage 与 `/messages` 总耗时，并确认仍 pending 的请求不再在 120 秒形成错误气泡。
+- 关联：`server-rs/crates/platform-editor-agent/src/agent/agent.rs`、`server-rs/crates/platform-editor-agent/src/framework/error.rs`、`server-rs/crates/api-server/src/state.rs`、`src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.ts`、`src/components/image-editor/EditorAgentConversation/MessageBubble.tsx`、`src/services/image-editor/editorAgentClient.ts`。
+
 ## 前端退役目录不能只靠扫描和 ignore 隔离
 
 - 现象：Tailwind `@source`、TypeScript 根 `include`、ESLint ignore 和 Vitest include 都排除了旧创作目录，但干净打开新版页面时，Vite 仍转换 `services/rpg-entry/index.ts`，构建产物也包含旧作品库和旧 profile 逻辑。

docs/【后端架构】server-rs与SpacetimeDB数据契约-2026-05-15.md

@@ -75,7 +75,8 @@ npm run check:server-rs-ddd
 - `/api/editor/projects/{projectId}/agent-conversations` 负责当前工程会话列表和新建；`/api/editor/agent-conversations/{conversationId}` 负责详情读取、终态工具消息懒回填和软删；`POST /api/editor/agent-conversations/{conversationId}/messages` 负责发送消息并返回普通 JSON `EditorAgentMessageResponse`，画布 Agent 不提供 `/messages/stream` SSE 路由。消息请求必须携带最长 128 字符的 `clientMessageId`；前端对该 POST 显式启用 1 次瞬时 transport 重试，并复用同一个序列化 body、`clientMessageId` 和 `x-request-id`。同一会话在锁内按该键幂等，重复键同内容返回已有回合或从已保存用户消息继续，异内容返回 `409`。数字 `EditorAgentMessage.id` 仍只作为工具确认 / 取消的后端消息定位符，不能复用为客户端幂等键。
 - `module-editor-agent` 只承载纯领域校验：标题派生、附件上限、消息输入规则和会话软删访问规则；不直接依赖 Axum、SpacetimeDB、OSS、LLM 或 Tokio。
 - `spacetime-module` 的 `editor_agent_conversation` 只保存元数据；创建、列表、读取、更新时间和软删通过 `create_editor_agent_conversation_and_return`、`list_editor_agent_conversations_and_return`、`get_editor_agent_conversation_and_return`、`touch_editor_agent_conversation_and_return`、`delete_editor_agent_conversation_and_return` procedure 完成，`api-server` 只能经 `spacetime-client` facade 访问。
-- 完整消息文档存 OSS `editor-agent/{conversationId}.json`，由 `api-server` 负责 2 MiB 上限、会话内串行锁、读改写、消息与工具结果持久化和 `touch` 元数据更新时间；该 JSON 不进入 `editor_canvas.layers_json`，也不作为画布布局真相。LLM / 规划失败必须写入 `role=system`、正文以 `ERROR ` 开头的消息，并通过 `deltaMessages` 返回，`errorMessage` 保持为空；前端隐藏前缀并显示红色错误气泡，后端仍把该 system 消息注入后续 LLM memory，使 Agent 能读取失败上下文。工具失败同样必须形成可回读记录，不能只返回瞬时错误。
+- 完整消息文档存 OSS `editor-agent/{conversationId}.json`，由 `api-server` 负责 2 MiB 上限、会话内串行锁、读改写、消息与工具结果持久化和 `touch` 元数据更新时间；该 JSON 不进入 `editor_canvas.layers_json`，也不作为画布布局真相。LLM 未配置、连接已经断开、请求明确失败、达到最终安全上限或规划不可解析时，必须写入 `role=system`、正文以 `ERROR ` 开头的消息，并通过 `deltaMessages` 返回，`errorMessage` 保持为空；前端隐藏前缀并显示红色错误气泡，面向用户的错误正文使用中文语义，不暴露 `completion error` 等 framework 内部前缀，后端仍把该 system 消息注入后续 LLM memory，使 Agent 能读取失败上下文。普通 JSON POST 尚未结束不形成持久化消息；工具失败同样必须形成可回读记录，不能只返回瞬时错误。
+- 画布 Agent 的 `gpt-5.4-mini` Chat Completions 规划使用 1024 `max_tokens`。前端在 POST pending 120 秒后显示不入库的耐心等待提示；provider request future 明确返回 connect/timeout/HTTP/transport 错误时立即进入正式失败，尚未返回则继续等待。专用 provider 单 attempt hard timeout 为 8 分钟；请求发起阶段的 timeout、连接失败、`408`、`429` 与 `5xx` 读取 `GENARRATIVE_LLM_MAX_RETRIES`，但画布 Agent 最多重试 1 次，显式配置 0 仍可关闭，专用重试退避最多 60 秒，使两次 attempt 的理论上限仍早于前端消息 POST 的 20 分钟 timeout；已收到成功响应头后的响应体读取或解析失败直接按明确失败收口。重试只包围 LLM 规划请求并发生在任何待确认工具执行之前，因此不会重复提交生成任务或扣费。
 - 对话附件只允许引用当前工程 `editor_project_resource` 或当前账号 `editor_asset` 的图片；前端可提交展示用 `imageSrc` / `thumbnailSrc`，后端必须按 `resourceId` / `assetId` 重新归一、校验 owner / project 和 `objectKey`，再给 LLM 或生成工具使用。
 - 画布 Agent 工具复用既有编辑器图片生成 / 修改 / 图标 spritesheet BFF，并继续使用后端模型定价和 `execute_billable_asset_operation_with_cost`；前端不提交 `priceMudPoints`。
 - `/messages/{messageId}/confirm` 与 `/messages/{messageId}/cancel` 只返回成功确认；前端成功后立即重新读取整个会话，以会话详情中的权威消息状态和 `externalJobId` 驱动气泡展示与任务轮询。

docs/【编辑器】画布Agent对话面板-2026-07-03.md

@@ -95,12 +95,12 @@
 ## LLM 与计费
 
 - 编排复用 `creative_agent_gpt5_client` 的 LLM 接入配置（同 provider/env，独立用途标识），画布 Agent 规划请求固定使用 VectorEngine `gpt-5.4-mini` Chat Completions；function-calling 注册八类工具。
-- 每个用户回合必须由 LLM 返回结构化计划；LLM 未配置、请求失败或返回格式不可解析时，后端写入正文为 `ERROR <错误内容>` 的 system 消息，不使用本地关键词或“收到：...”回显兜底。该错误消息与其它 system 消息一样进入后续 LLM memory，使 Agent 能看到上一轮失败上下文。
+- 每个用户回合必须由 LLM 返回结构化计划；LLM 未配置、连接已经断开、请求明确失败、达到最终安全上限或返回格式不可解析时，后端写入正文为 `ERROR <错误内容>` 的 system 消息，不使用本地关键词或“收到：...”回显兜底。面向用户的规划错误使用中文语义，不暴露 `completion error` 等 framework 内部前缀。该错误消息与其它 system 消息一样进入后续 LLM memory，使 Agent 能看到上一轮失败上下文。普通 JSON POST 尚未结束只表示 provider request future 仍在等待，不能伪装成已持久化失败。
 - 规划 prompt 必须自动带入上一条已完成生成结果的 `latestGeneratedImage` 引用，内容只包含上一轮 generation 的 `toolName` / `resourceId` / `objectKey` / `assetObjectId` 等轻量元数据，不把私有签名 URL 或大图内容塞进 prompt。
 - 工具参数中的图片 ID 是由真实 object key 或图片地址计算的稳定 SHA-256 标识；真实 data key 仅存于 api-server 的工具上下文映射，所有图片工具在执行时查表恢复，不能把 object key 或图片地址作为 LLM 可见的工具 ID。
 - 用户使用「这张」「刚才那个」「上一张」「把衣服换成……」等方式指代或编辑上一张结果图时，LLM 默认选择 `edit_image` 并引用 `latestGeneratedImage` 作为源图；除非用户明确要求全新生成，否则不能因为本轮没有重新上传附件而降级为 `generate_image`。
 - 规划 prompt 必须显式区分“规范展板”和“实际素材产出”：规范图、视觉规范图、风格规范图、素材规范展板、角色规范图等规范展板请求走 `generate_image`，并补齐统一视角、线条粗细、色卡、材质、阴影、圆角、状态层级、尺寸标注等要求；实际角色立绘才走 `generate_character`，多个图标素材 / 图集才走 `generate_icon_spritesheet`。
-- 画布 Agent 规划请求使用 Chat Completions、1024 `max_tokens` 和 60 秒 Agent 专用请求超时；生成图片/编辑图片仍走对应生成工具和模型计费。
+- 画布 Agent 规划请求使用 Chat Completions 和 1024 `max_tokens`。发送后 120 秒是前端软提示阈值，不是 provider 失败 deadline：若普通 JSON POST 仍 pending，消息流临时显示“仍在处理中，请耐心等待”并继续等待，提示不写入 OSS 消息历史；连接或请求明确失败则立即按正式错误收口。provider 单 attempt 保留 8 分钟 hard timeout；请求发起阶段的 timeout、连接失败、`408`、`429` 与 `5xx` 读取 `GENARRATIVE_LLM_MAX_RETRIES`，但画布 Agent 最多重试 1 次，专用重试退避最多 60 秒，使两次 attempt 的理论最坏等待仍早于前端 20 分钟 transport timeout；已收到成功响应头后的响应体读取或解析失败直接按明确失败收口。规划重试发生在任何生成工具执行之前，不会重复提交生成任务或扣费；生成图片/编辑图片仍走对应生成工具和模型计费。
 - function-calling runner 必须把“等待用户确认”作为显式工具语义：当本批所有工具都校验成功并进入待确认状态时，立即以成功结果结束当前规划回合并持久化助手文本与待确认卡，不得继续依赖 LLM 自行停止；未知工具、参数错误、普通连续工具和不可解析响应仍受 `max_turns` 保护。
 - **对话回合免费**（聊天、分析回复不扣泥点），仅 Agent 实际触发生成工具时按对应模型定价扣泥点。
 - 工具调用前后端校验泥点余额；不足时该次生成失败并在对话中以明确错误气泡告知，对话本身可继续。
@@ -115,7 +115,7 @@
 4. 消息内生成结果缩略图（纯预览，不显示名称，不点击聚焦图层）；
 5. 生成中的进行中动画；
 6. 错误气泡（失败/余额不足，带原因）；
-7. 普通消息请求等待期间禁用发送按钮，不提供客户端停止操作；前端持续等待后端响应，避免后端已持久化消息但前端中断请求后产生会话状态错位。
+7. 普通消息请求等待期间禁用发送按钮，不提供客户端停止操作；前端持续等待后端响应，超过 120 秒但 POST 仍 pending 时在思考气泡中显示“仍在处理中，请耐心等待”，最终成功或失败后自动移除，避免后端已持久化消息但前端中断请求后产生会话状态错位。
 
 不做（明确排除，防止后人补齐）：
 

server-rs/crates/api-server/src/state.rs

@@ -48,6 +48,8 @@ use crate::work_author::{
 };
 
 const ADMIN_ROLE: &str = "admin";
+const EDITOR_AGENT_LLM_MAX_RETRIES: u32 = 1;
+const EDITOR_AGENT_LLM_MAX_RETRY_BACKOFF_MS: u64 = 60_000;
 pub(crate) const CHARACTER_ANIMATION_OSS_MAX_CONCURRENCY: usize = 8;
 
 pub type HttpRequestPermitPool = Semaphore;
@@ -2084,8 +2086,10 @@ fn build_editor_agent_llm_client(
         api_key.to_string(),
         platform_llm::EDITOR_AGENT_GPT5_MODEL.to_string(),
         config.llm_request_timeout_ms,
-        0,
-        config.llm_retry_backoff_ms,
+        config.llm_max_retries.min(EDITOR_AGENT_LLM_MAX_RETRIES),
+        config
+            .llm_retry_backoff_ms
+            .min(EDITOR_AGENT_LLM_MAX_RETRY_BACKOFF_MS),
     )?;
 
     Ok(Some(LlmClient::new(llm_config)?))
@@ -2354,6 +2358,8 @@ mod tests {
     fn app_state_builds_editor_agent_llm_client_from_vector_engine_settings() {
         let mut config = AppConfig::default();
         config.llm_api_key = None;
+        config.llm_max_retries = 2;
+        config.llm_retry_backoff_ms = 120_000;
         config.vector_engine_base_url = "https://api.vectorengine.test".to_string();
         config.vector_engine_api_key = Some("ve-key".to_string());
 
@@ -2371,6 +2377,8 @@ mod tests {
             "https://api.vectorengine.test/v1/chat/completions"
         );
         assert!(!client.config().official_fallback());
+        assert_eq!(client.config().max_retries(), 1);
+        assert_eq!(client.config().retry_backoff_ms(), 60_000);
     }
 
     fn test_feature_gate(gate_key: &str) -> module_runtime::FeatureGateConfigSnapshot {

server-rs/crates/platform-editor-agent/src/agent/agent.rs

@@ -8,7 +8,7 @@ use platform_llm::{EDITOR_AGENT_GPT5_MODEL, LlmClient, LlmMessage, LlmTextReques
 use serde_json::Value;
 
 const EDITOR_AGENT_LLM_MAX_OUTPUT_TOKENS: u32 = 1024;
-const EDITOR_AGENT_LLM_REQUEST_TIMEOUT_MS: u64 = 60_000;
+const EDITOR_AGENT_LLM_HARD_REQUEST_TIMEOUT_MS: u64 = 480_000;
 
 pub struct LlmCompletionModel {
     client: LlmClient,
@@ -41,7 +41,7 @@ fn build_editor_agent_llm_request(messages: Vec<LlmMessage>) -> LlmTextRequest {
     LlmTextRequest::new(messages)
         .with_model(EDITOR_AGENT_GPT5_MODEL)
         .with_max_tokens(EDITOR_AGENT_LLM_MAX_OUTPUT_TOKENS)
-        .with_request_timeout_ms(EDITOR_AGENT_LLM_REQUEST_TIMEOUT_MS)
+        .with_request_timeout_ms(EDITOR_AGENT_LLM_HARD_REQUEST_TIMEOUT_MS)
 }
 
 pub struct LlmChatAgentBuilder {
@@ -188,7 +188,7 @@ mod tests {
 
         assert_eq!(request.model.as_deref(), Some(EDITOR_AGENT_GPT5_MODEL));
         assert_eq!(request.max_tokens, Some(1024));
-        assert_eq!(request.request_timeout_ms, Some(60_000));
+        assert_eq!(request.request_timeout_ms, Some(480_000));
         assert_eq!(request.messages.len(), 2);
     }
 }

server-rs/crates/platform-editor-agent/src/framework/error.rs

@@ -9,14 +9,45 @@ pub enum PromptError {
 impl std::fmt::Display for PromptError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Self::CompletionError(msg) => write!(f, "completion error: {msg}"),
-            Self::ToolError(msg) => write!(f, "tool error: {msg}"),
-            Self::InternalError(msg) => write!(f, "internal error: {msg}"),
+            Self::CompletionError(msg) => write!(f, "美术 Agent 规划失败：{msg}"),
+            Self::ToolError(msg) => write!(f, "美术 Agent 工具执行失败：{msg}"),
+            Self::InternalError(msg) => write!(f, "美术 Agent 内部错误：{msg}"),
             Self::MaxTurnsReached { max_turns } => {
-                write!(f, "max turns reached: {max_turns}")
+                write!(f, "美术 Agent 规划轮数已达上限：{max_turns}")
             }
         }
     }
 }
 
 impl std::error::Error for PromptError {}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn completion_error_uses_user_facing_chinese_copy() {
+        let error = PromptError::CompletionError("LLM 请求超时，累计尝试 2 次".to_string());
+
+        assert_eq!(
+            error.to_string(),
+            "美术 Agent 规划失败：LLM 请求超时，累计尝试 2 次"
+        );
+    }
+
+    #[test]
+    fn other_errors_do_not_expose_framework_prefixes() {
+        assert_eq!(
+            PromptError::ToolError("参数无效".to_string()).to_string(),
+            "美术 Agent 工具执行失败：参数无效"
+        );
+        assert_eq!(
+            PromptError::InternalError("序列化失败".to_string()).to_string(),
+            "美术 Agent 内部错误：序列化失败"
+        );
+        assert_eq!(
+            PromptError::MaxTurnsReached { max_turns: 3 }.to_string(),
+            "美术 Agent 规划轮数已达上限：3"
+        );
+    }
+}

src/components/image-editor/EditorAgentConversation/EditorAgentConversationPanelView.test.tsx

@@ -8,13 +8,14 @@ import {
   waitFor,
   within,
 } from '@testing-library/react';
-import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 
 import type {
   EditorAgentMessage,
   EditorAgentMessageResponse,
 } from '@/packages/shared/src/contracts';
 import type { EditorAgentConversationClient } from '@/src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.ts';
+import { EDITOR_AGENT_PATIENCE_NOTICE_DELAY_MS } from '@/src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.ts';
 import { useImageCanvasContextStore } from '@/src/components/image-editor/useImageCanvasContextStore.ts';
 
 import { EditorAgentConversationPanelView } from './EditorAgentConversationPanelView.tsx';
@@ -114,6 +115,10 @@ function createClient(): EditorAgentConversationClient {
   };
 }
 
+afterEach(() => {
+  vi.useRealTimers();
+});
+
 function createPendingToolCallMessage(): EditorAgentMessage {
   return {
     id: 2,
@@ -331,18 +336,26 @@ describe('EditorAgentConversationPanelView', () => {
     await waitFor(() => {
       expect(screen.getByText('已经看到画布内容')).toBeTruthy();
     });
+    vi.useFakeTimers();
 
     fireEvent.change(screen.getByLabelText('发送给画布 Agent'), {
       target: { value: '继续规划' },
     });
     fireEvent.click(screen.getByRole('button', { name: '发送' }));
 
-    await waitFor(() => {
-      expect(
-        screen.getByRole('button', { name: '发送' }).hasAttribute('disabled'),
-      ).toBe(true);
+    await act(async () => {
+      await Promise.resolve();
     });
+    expect(
+      screen.getByRole('button', { name: '发送' }).hasAttribute('disabled'),
+    ).toBe(true);
     expect(screen.queryByRole('button', { name: '停止' })).toBeNull();
+    expect(screen.queryByText('仍在处理中，请耐心等待')).toBeNull();
+
+    act(() => {
+      vi.advanceTimersByTime(EDITOR_AGENT_PATIENCE_NOTICE_DELAY_MS);
+    });
+    expect(screen.getByText('仍在处理中，请耐心等待')).toBeTruthy();
 
     await act(async () => {
       resolveSend({
@@ -355,7 +368,9 @@ describe('EditorAgentConversationPanelView', () => {
         deltaMessages: [],
         errorMessage: null,
       });
+      await Promise.resolve();
     });
+    expect(screen.queryByText('仍在处理中，请耐心等待')).toBeNull();
   });
 
   it('uploads pasted images as canvas attachments before sending', async () => {
@@ -431,9 +446,7 @@ describe('EditorAgentConversationPanelView', () => {
       );
     });
     expect(screen.getByRole('option', { name: '角色参考' })).toBeTruthy();
-    expect(
-      screen.queryByRole('option', { name: 'conversation-1' }),
-    ).toBeNull();
+    expect(screen.queryByRole('option', { name: 'conversation-1' })).toBeNull();
   });
 
   it('sends selected attachments even when the text input is empty', async () => {
@@ -555,9 +568,9 @@ describe('EditorAgentConversationPanelView', () => {
     ).toBe('失败后恢复这条草稿');
     expect(screen.getByText('角色图层')).toBeTruthy();
     expect(
-      within(screen.getByRole('log', { name: '画布 Agent 消息流' })).queryByText(
-        '失败后恢复这条草稿',
-      ),
+      within(
+        screen.getByRole('log', { name: '画布 Agent 消息流' }),
+      ).queryByText('失败后恢复这条草稿'),
     ).toBeNull();
   });
 
@@ -692,9 +705,9 @@ describe('EditorAgentConversationPanelView', () => {
     });
     expect(screen.getByRole('button', { name: '执行中' })).toBeTruthy();
     expect(screen.queryByRole('button', { name: '确认' })).toBeNull();
-    expect(screen.getByRole('button', { name: '取消' }).hasAttribute('disabled')).toBe(
-      true,
-    );
+    expect(
+      screen.getByRole('button', { name: '取消' }).hasAttribute('disabled'),
+    ).toBe(true);
 
     await act(async () => {
       resolveConfirmation();

src/components/image-editor/EditorAgentConversation/EditorAgentConversationPanelView.tsx

@@ -258,6 +258,7 @@ export function EditorAgentConversationPanelView({
     isCreatingConversation,
     isDeletingConversation,
     isWaiting,
+    isPatienceNoticeVisible,
     toolCallAction,
     isToolCallActionPending,
     errorMessage,
@@ -614,7 +615,9 @@ export function EditorAgentConversationPanelView({
                   }}
                 />
               ))}
-              {isWaiting ? <ThinkingBubble /> : null}
+              {isWaiting ? (
+                <ThinkingBubble showPatienceNotice={isPatienceNoticeVisible} />
+              ) : null}
             </>
           ) : (
             <div className="rounded-3xl border border-dashed border-slate-200 bg-white/70 px-4 py-8 text-center text-sm text-slate-400">

src/components/image-editor/EditorAgentConversation/MessageBubble.test.tsx

@@ -5,7 +5,7 @@ import { describe, expect, it, vi } from 'vitest';
 
 import type { EditorAgentMessage } from '@/packages/shared/src/contracts';
 
-import { MessageBubble } from './MessageBubble.tsx';
+import { MessageBubble, ThinkingBubble } from './MessageBubble.tsx';
 
 function renderMessage(message: EditorAgentMessage) {
   return render(
@@ -19,6 +19,18 @@ function renderMessage(message: EditorAgentMessage) {
 }
 
 describe('MessageBubble', () => {
+  it('shows a patience notice only for an extended pending request', () => {
+    const { rerender } = render(<ThinkingBubble />);
+
+    expect(screen.getByLabelText('Agent思考中')).toBeTruthy();
+    expect(screen.queryByText('仍在处理中，请耐心等待')).toBeNull();
+
+    rerender(<ThinkingBubble showPatienceNotice />);
+
+    expect(screen.getByLabelText('Agent仍在处理中')).toBeTruthy();
+    expect(screen.getByText('仍在处理中，请耐心等待')).toBeTruthy();
+  });
+
   it('shows prefixed system errors as red Agent errors without the wire prefix', () => {
     renderMessage({
       id: 2,

src/components/image-editor/EditorAgentConversation/MessageBubble.tsx

@@ -14,9 +14,16 @@ function messageRoleLabel(role: EditorAgentMessage['role']) {
   return 'Agent';
 }
 
-export function ThinkingBubble() {
+export function ThinkingBubble({
+  showPatienceNotice = false,
+}: {
+  showPatienceNotice?: boolean;
+}) {
   return (
-    <article className="flex justify-start" aria-label="Agent思考中">
+    <article
+      className="flex justify-start"
+      aria-label={showPatienceNotice ? 'Agent仍在处理中' : 'Agent思考中'}
+    >
       <div className="max-w-[86%] rounded-3xl border border-slate-200 bg-white px-3.5 py-3 text-sm leading-6 shadow-sm">
         <div className="flex items-center gap-1.5">
           <span className="flex gap-0.5">
@@ -33,6 +40,9 @@ export function ThinkingBubble() {
               style={{ animationDelay: '300ms' }}
             />
           </span>
+          {showPatienceNotice ? (
+            <span className="text-slate-600">仍在处理中，请耐心等待</span>
+          ) : null}
         </div>
       </div>
     </article>
@@ -61,7 +71,11 @@ export function MessageBubble({
       ? message.text.slice(EDITOR_AGENT_ERROR_MESSAGE_PREFIX.length)
       : null;
 
-  if (message.role === 'system' && !message.toolCall && systemErrorText === null) {
+  if (
+    message.role === 'system' &&
+    !message.toolCall &&
+    systemErrorText === null
+  ) {
     return null;
   }
   if (

src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.test.tsx

@@ -1,7 +1,7 @@
 /* @vitest-environment jsdom */
 
 import { act, renderHook, waitFor } from '@testing-library/react';
-import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 
 import type {
   EditorAgentConversationDetail,
@@ -9,6 +9,7 @@ import type {
   EditorAgentMessageResponse,
 } from '../../../../packages/shared/src/contracts/editorAgent.ts';
 import {
+  EDITOR_AGENT_PATIENCE_NOTICE_DELAY_MS,
   type EditorAgentConversationClient,
   useEditorAgentConversation,
 } from './useEditorAgentConversation.ts';
@@ -116,6 +117,10 @@ describe('useEditorAgentConversation', () => {
     vi.clearAllMocks();
   });
 
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
   it('loads conversations and applies delta messages', async () => {
     const client = createClient();
     const onCanvasRefreshRequested = vi.fn();
@@ -445,6 +450,87 @@ describe('useEditorAgentConversation', () => {
     );
   });
 
+  it('does not send or apply a stale conversation created after switching projects', async () => {
+    const client = createClient();
+    let resolveCreate!: (detail: EditorAgentConversationDetail) => void;
+    vi.mocked(client.listConversations)
+      .mockResolvedValueOnce([])
+      .mockResolvedValueOnce([
+        {
+          conversationId: 'conversation-project-2',
+          projectId: 'project-2',
+          title: '项目二会话',
+          updatedAt: '2026-07-03T00:02:00.000Z',
+        },
+      ]);
+    vi.mocked(client.createConversation).mockImplementationOnce(
+      () =>
+        new Promise<EditorAgentConversationDetail>((resolve) => {
+          resolveCreate = resolve;
+        }),
+    );
+    vi.mocked(client.getConversation).mockResolvedValueOnce({
+      conversationId: 'conversation-project-2',
+      projectId: 'project-2',
+      title: '项目二会话',
+      messages: [
+        {
+          id: 20,
+          role: 'assistant',
+          text: '项目二消息',
+          attachments: [],
+          toolCall: null,
+          createdAt: '2026-07-03T00:02:00.000Z',
+        },
+      ],
+      createdAt: '2026-07-03T00:02:00.000Z',
+      updatedAt: '2026-07-03T00:02:00.000Z',
+    });
+    const { result, rerender } = renderHook(
+      ({ projectId }) => useEditorAgentConversation({ projectId, client }),
+      { initialProps: { projectId: 'project-1' } },
+    );
+
+    await waitFor(() => {
+      expect(result.current.isLoadingConversations).toBe(false);
+    });
+
+    let sendPromise!: Promise<void>;
+    act(() => {
+      sendPromise = result.current.sendMessage('旧项目消息');
+    });
+    await waitFor(() => {
+      expect(client.createConversation).toHaveBeenCalledWith('project-1', {});
+    });
+
+    rerender({ projectId: 'project-2' });
+    await waitFor(() => {
+      expect(result.current.activeConversationId).toBe(
+        'conversation-project-2',
+      );
+    });
+
+    await act(async () => {
+      resolveCreate({
+        conversationId: 'conversation-project-1',
+        projectId: 'project-1',
+        title: '旧项目新会话',
+        messages: [],
+        createdAt: '2026-07-03T00:01:00.000Z',
+        updatedAt: '2026-07-03T00:01:00.000Z',
+      });
+      await sendPromise;
+    });
+
+    expect(client.sendMessage).not.toHaveBeenCalled();
+    expect(result.current.activeConversationId).toBe('conversation-project-2');
+    expect(result.current.messages.map((message) => message.text)).toEqual([
+      '项目二消息',
+    ]);
+    expect(result.current.isWaiting).toBe(false);
+    expect(result.current.isPatienceNoticeVisible).toBe(false);
+  });
+
   it('allows sending an attachment-only message', async () => {
     const client = createClient();
     const { result } = renderHook(() =>
@@ -769,7 +855,9 @@ describe('useEditorAgentConversation', () => {
     );
 
     await waitFor(() => {
-      expect(result.current.messages[0]?.toolCall?.status).toBe('not_completed');
+      expect(result.current.messages[0]?.toolCall?.status).toBe(
+        'not_completed',
+      );
     });
     const getConversationCallsBeforeCancel = vi.mocked(client.getConversation)
       .mock.calls.length;
@@ -809,6 +897,78 @@ describe('useEditorAgentConversation', () => {
     expect(result.current.messages).toHaveLength(0);
   });
 
+  it('replaces the extended patience notice with the actual request failure', async () => {
+    const client = createClient();
+    let rejectSend!: (error: Error) => void;
+    vi.mocked(client.sendMessage).mockImplementation(
+      () =>
+        new Promise<EditorAgentMessageResponse>((_resolve, reject) => {
+          rejectSend = reject;
+        }),
+    );
+    const { result } = renderHook(() =>
+      useEditorAgentConversation({ projectId: 'project-1', client }),
+    );
+
+    await waitFor(() => {
+      expect(result.current.activeConversation?.conversationId).toBe(
+        'conversation-1',
+      );
+    });
+
+    vi.useFakeTimers();
+    let sendPromise!: Promise<void>;
+    act(() => {
+      sendPromise = result.current.sendMessage('请继续');
+    });
+    await act(async () => {
+      await Promise.resolve();
+    });
+    act(() => {
+      vi.advanceTimersByTime(EDITOR_AGENT_PATIENCE_NOTICE_DELAY_MS);
+    });
+    expect(result.current.isPatienceNoticeVisible).toBe(true);
+
+    await act(async () => {
+      rejectSend(new Error('LLM 连接已断开'));
+      await sendPromise.catch(() => undefined);
+    });
+
+    expect(result.current.isPatienceNoticeVisible).toBe(false);
+    expect(result.current.isWaiting).toBe(false);
+    expect(result.current.errorMessage).toBe('LLM 连接已断开');
+    expect(result.current.messages).toHaveLength(0);
+  });
+
+  it('cleans the patience timer when the hook unmounts', async () => {
+    const client = createClient();
+    vi.mocked(client.sendMessage).mockImplementation(
+      () => new Promise<EditorAgentMessageResponse>(() => undefined),
+    );
+    const { result, unmount } = renderHook(() =>
+      useEditorAgentConversation({ projectId: 'project-1', client }),
+    );
+
+    await waitFor(() => {
+      expect(result.current.activeConversation?.conversationId).toBe(
+        'conversation-1',
+      );
+    });
+
+    vi.useFakeTimers();
+    act(() => {
+      void result.current.sendMessage('请继续');
+    });
+    await act(async () => {
+      await Promise.resolve();
+    });
+    expect(vi.getTimerCount()).toBe(1);
+
+    unmount();
+
+    expect(vi.getTimerCount()).toBe(0);
+  });
+
   it('keeps the active request pending without exposing a stop action', async () => {
     const client = createClient();
     let capturedSignal: AbortSignal | null = null;
@@ -830,16 +990,27 @@ describe('useEditorAgentConversation', () => {
       );
     });
 
-    void act(() => {
-      void result.current.sendMessage('请继续');
+    vi.useFakeTimers();
+    let sendPromise!: Promise<void>;
+    act(() => {
+      sendPromise = result.current.sendMessage('请继续');
+      void result.current.sendMessage('不要重复发送');
     });
-    await waitFor(() => {
-      expect(result.current.isWaiting).toBe(true);
+    await act(async () => {
+      await Promise.resolve();
     });
 
+    expect(result.current.isWaiting).toBe(true);
+    expect(result.current.isPatienceNoticeVisible).toBe(false);
+    expect(client.sendMessage).toHaveBeenCalledTimes(1);
     expect(capturedSignal).toBeNull();
     expect('stopCurrentTurn' in result.current).toBe(false);
 
+    act(() => {
+      vi.advanceTimersByTime(EDITOR_AGENT_PATIENCE_NOTICE_DELAY_MS);
+    });
+    expect(result.current.isPatienceNoticeVisible).toBe(true);
+
     await act(async () => {
       resolveSend({
         conversation: {
@@ -851,10 +1022,10 @@ describe('useEditorAgentConversation', () => {
         deltaMessages: [],
         errorMessage: null,
       });
+      await sendPromise;
     });
 
-    await waitFor(() => {
-      expect(result.current.isWaiting).toBe(false);
-    });
+    expect(result.current.isWaiting).toBe(false);
+    expect(result.current.isPatienceNoticeVisible).toBe(false);
   });
 });

src/components/image-editor/EditorAgentConversation/useEditorAgentConversation.ts

@@ -40,14 +40,8 @@ export type EditorAgentConversationClient = {
     payload: EditorAgentMessageRequest,
     options: SendEditorAgentMessageOptions,
   ) => Promise<EditorAgentMessageResponse>;
-  confirmToolCall: (
-    conversationId: string,
-    messageId: number,
-  ) => Promise<void>;
-  cancelToolCall: (
-    conversationId: string,
-    messageId: number,
-  ) => Promise<void>;
+  confirmToolCall: (conversationId: string, messageId: number) => Promise<void>;
+  cancelToolCall: (conversationId: string, messageId: number) => Promise<void>;
 };
 
 type UseEditorAgentConversationOptions = {
@@ -74,6 +68,8 @@ const defaultEditorAgentConversationClient: EditorAgentConversationClient = {
   cancelToolCall: cancelEditorAgentToolCall,
 };
 
+export const EDITOR_AGENT_PATIENCE_NOTICE_DELAY_MS = 120_000;
+
 function createEditorAgentClientMessageId() {
   const randomId =
     typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function'
@@ -155,16 +151,51 @@ export function useEditorAgentConversation({
   const [isCreatingConversation, setIsCreatingConversation] = useState(false);
   const [isDeletingConversation, setIsDeletingConversation] = useState(false);
   const [isWaiting, setIsWaiting] = useState(false);
+  const [patienceNoticeConversationId, setPatienceNoticeConversationId] =
+    useState<string | null>(null);
   const [toolCallAction, setToolCallAction] =
     useState<EditorAgentToolCallActionState>(null);
   const [errorMessage, setErrorMessage] = useState<string | null>(null);
+  const normalizedProjectIdRef = useRef(normalizedProjectId);
   const activeConversationIdRef = useRef<string | null>(null);
   const activeToolCallActionRef = useRef<EditorAgentToolCallActionState>(null);
   const conversationLoadRequestIdRef = useRef(0);
+  const createConversationRequestIdRef = useRef(0);
+  const isWaitingRef = useRef(false);
+  const pendingSendRequestIdRef = useRef(0);
+  const patienceNoticeTimerRef = useRef<ReturnType<typeof setTimeout> | null>(
+    null,
+  );
 
   useEffect(() => {
     activeConversationIdRef.current = activeConversationId;
   }, [activeConversationId]);
+  normalizedProjectIdRef.current = normalizedProjectId;
+
+  useEffect(() => {
+    return () => {
+      pendingSendRequestIdRef.current += 1;
+      createConversationRequestIdRef.current += 1;
+      isWaitingRef.current = false;
+      if (patienceNoticeTimerRef.current !== null) {
+        clearTimeout(patienceNoticeTimerRef.current);
+        patienceNoticeTimerRef.current = null;
+      }
+    };
+  }, []);
+
+  useEffect(() => {
+    pendingSendRequestIdRef.current += 1;
+    createConversationRequestIdRef.current += 1;
+    isWaitingRef.current = false;
+    if (patienceNoticeTimerRef.current !== null) {
+      clearTimeout(patienceNoticeTimerRef.current);
+      patienceNoticeTimerRef.current = null;
+    }
+    setIsWaiting(false);
+    setIsCreatingConversation(false);
+    setPatienceNoticeConversationId(null);
+  }, [normalizedProjectId]);
 
   const activeConversation = useMemo(
     () =>
@@ -193,10 +224,7 @@ export function useEditorAgentConversation({
   );
 
   const loadConversation = useCallback(
-    async (
-      conversationId: string,
-      options: { showLoading?: boolean } = {},
-    ) => {
+    async (conversationId: string, options: { showLoading?: boolean } = {}) => {
       const requestId = conversationLoadRequestIdRef.current + 1;
       conversationLoadRequestIdRef.current = requestId;
       const showLoading = options.showLoading ?? true;
@@ -287,19 +315,37 @@ export function useEditorAgentConversation({
     if (!normalizedProjectId) {
       throw new Error('缺少画布项目 ID');
     }
+    const requestedProjectId = normalizedProjectId;
+    const requestId = createConversationRequestIdRef.current + 1;
+    createConversationRequestIdRef.current = requestId;
     setIsCreatingConversation(true);
     setErrorMessage(null);
     try {
-      const detail = await client.createConversation(normalizedProjectId, {});
-      applyConversationDetail(detail);
+      const detail = await client.createConversation(requestedProjectId, {});
+      if (
+        createConversationRequestIdRef.current === requestId &&
+        normalizedProjectIdRef.current === requestedProjectId
+      ) {
+        applyConversationDetail(detail);
+      }
       return detail;
     } catch (error) {
-      setErrorMessage(
-        error instanceof Error ? error.message : '创建画布 Agent 会话失败',
-      );
+      if (
+        createConversationRequestIdRef.current === requestId &&
+        normalizedProjectIdRef.current === requestedProjectId
+      ) {
+        setErrorMessage(
+          error instanceof Error ? error.message : '创建画布 Agent 会话失败',
+        );
+      }
       throw error;
     } finally {
-      setIsCreatingConversation(false);
+      if (
+        createConversationRequestIdRef.current === requestId &&
+        normalizedProjectIdRef.current === requestedProjectId
+      ) {
+        setIsCreatingConversation(false);
+      }
     }
   }, [applyConversationDetail, client, normalizedProjectId]);
 
@@ -328,9 +374,9 @@ export function useEditorAgentConversation({
           const toolCall = message.toolCall;
           return Boolean(
             toolCall?.externalJobId &&
-            (toolCall.images.length > 0 ||
-              (toolCall.videos?.length ?? 0) > 0 ||
-              (toolCall.audios?.length ?? 0) > 0),
+              (toolCall.images.length > 0 ||
+                (toolCall.videos?.length ?? 0) > 0 ||
+                (toolCall.audios?.length ?? 0) > 0),
           );
         })
       ) {
@@ -363,29 +409,49 @@ export function useEditorAgentConversation({
       const text = rawText.trim();
       if (
         (!text && !attachments.length) ||
-        isWaiting ||
+        isWaitingRef.current ||
         activeToolCallActionRef.current !== null ||
         isLoadingConversations ||
         isLoadingMessages
       ) {
         return;
       }
-      const conversationId = await ensureConversationForSend();
-      const clientMessageId = createEditorAgentClientMessageId();
+      isWaitingRef.current = true;
+      const requestedProjectId = normalizedProjectId;
+      const requestId = pendingSendRequestIdRef.current + 1;
+      pendingSendRequestIdRef.current = requestId;
       setErrorMessage(null);
       setIsWaiting(true);
-      const optimisticMessage = createLocalUserMessage({
-        id: -1,
-        clientMessageId,
-        text,
-        attachments,
-      });
-      setMessages((currentMessages) => [
-        ...currentMessages,
-        optimisticMessage,
-      ]);
+      setPatienceNoticeConversationId(null);
+      let conversationId: string | null = null;
+      let optimisticMessage: EditorAgentMessage | null = null;
 
       try {
+        conversationId = await ensureConversationForSend();
+        if (
+          pendingSendRequestIdRef.current !== requestId ||
+          normalizedProjectIdRef.current !== requestedProjectId
+        ) {
+          return;
+        }
+        const clientMessageId = createEditorAgentClientMessageId();
+        const nextOptimisticMessage = createLocalUserMessage({
+          id: -1,
+          clientMessageId,
+          text,
+          attachments,
+        });
+        optimisticMessage = nextOptimisticMessage;
+        setMessages((currentMessages) => [
+          ...currentMessages,
+          nextOptimisticMessage,
+        ]);
+        const pendingConversationId = conversationId;
+        patienceNoticeTimerRef.current = setTimeout(() => {
+          if (pendingSendRequestIdRef.current === requestId) {
+            setPatienceNoticeConversationId(pendingConversationId);
+          }
+        }, EDITOR_AGENT_PATIENCE_NOTICE_DELAY_MS);
         const response = await client.sendMessage(
           conversationId,
           {
@@ -396,6 +462,9 @@ export function useEditorAgentConversation({
           {},
         );
 
+        if (pendingSendRequestIdRef.current !== requestId) {
+          return;
+        }
         setConversations((currentConversations) =>
           upsertConversationSummary(
             currentConversations,
@@ -413,15 +482,31 @@ export function useEditorAgentConversation({
       } catch (error) {
         const message =
           error instanceof Error ? error.message : '发送画布 Agent 消息失败';
-        if (activeConversationIdRef.current === conversationId) {
+        const shouldReportError =
+          pendingSendRequestIdRef.current === requestId &&
+          (!conversationId ||
+            activeConversationIdRef.current === conversationId);
+        if (shouldReportError) {
           setErrorMessage(message);
-          setMessages((currentMessages) =>
-            currentMessages.filter((message) => message !== optimisticMessage),
-          );
+          if (optimisticMessage) {
+            setMessages((currentMessages) =>
+              currentMessages.filter(
+                (message) => message !== optimisticMessage,
+              ),
+            );
+          }
+          throw error;
         }
-        throw error;
       } finally {
-        setIsWaiting(false);
+        if (pendingSendRequestIdRef.current === requestId) {
+          if (patienceNoticeTimerRef.current !== null) {
+            clearTimeout(patienceNoticeTimerRef.current);
+            patienceNoticeTimerRef.current = null;
+          }
+          isWaitingRef.current = false;
+          setIsWaiting(false);
+          setPatienceNoticeConversationId(null);
+        }
       }
     },
     [
@@ -430,7 +515,7 @@ export function useEditorAgentConversation({
       applyDeltaMessages,
       isLoadingConversations,
       isLoadingMessages,
-      isWaiting,
+      normalizedProjectId,
     ],
   );
 
@@ -537,6 +622,8 @@ export function useEditorAgentConversation({
     isCreatingConversation,
     isDeletingConversation,
     isWaiting,
+    isPatienceNoticeVisible:
+      isWaiting && patienceNoticeConversationId === activeConversationId,
     toolCallAction,
     isToolCallActionPending: toolCallAction !== null,
     errorMessage,