diff --git a/.ai-project/state.yaml b/.ai-project/state.yaml
index 5e36c2f..abe99a4 100644
--- a/.ai-project/state.yaml
+++ b/.ai-project/state.yaml
@@ -26,10 +26,10 @@
 功能:
   - 编号: "F-001"
     名称: "应用外壳、首次状态与普通会话"
-    状态: "待用户查看"
+    状态: "已完成"
   - 编号: "F-002"
     名称: "Agent Core 与 DeepSeek 流式回复"
-    状态: "待开始"
+    状态: "待用户查看"
   - 编号: "F-003"
     名称: "项目管理与项目聊天"
     状态: "待开始"
diff --git a/apps/web-server/src/composition/create-app.ts b/apps/web-server/src/composition/create-app.ts
index 910ff58..c119b6b 100644
--- a/apps/web-server/src/composition/create-app.ts
+++ b/apps/web-server/src/composition/create-app.ts
@@ -4,16 +4,25 @@ import { createErrorHandler } from "../http/error-handler";
 import { requestId } from "../http/request-id";
 import { createHealthRoutes } from "../routes/health";
 import { createConversationRoutes } from "../routes/conversations";
-import type { ConversationService } from "@great-agent/agent-core";
+import type {
+  AgentRunService,
+  ConversationService,
+} from "@great-agent/agent-core";
+import type { RunRegistry } from "./run-registry";
+import { createRunRoutes } from "../routes/runs";
 
 export function createApp(
   logger: Logger,
   conversations?: ConversationService,
+  runs?: AgentRunService,
+  runRegistry?: RunRegistry,
 ): Hono {
   const app = new Hono();
   app.use("*", requestId);
   app.onError(createErrorHandler(logger));
   app.route("/api", createHealthRoutes());
   if (conversations) app.route("/api", createConversationRoutes(conversations));
+  if (runs && runRegistry)
+    app.route("/api", createRunRoutes(runs, runRegistry));
   return app;
 }
diff --git a/apps/web-server/src/composition/run-registry.ts b/apps/web-server/src/composition/run-registry.ts
new file mode 100644
index 0000000..241f3fa
--- /dev/null
+++ b/apps/web-server/src/composition/run-registry.ts
@@ -0,0 +1,36 @@
+import type { RunEvent } from "@great-agent/agent-core";
+
+type Listener = (event: RunEvent) => Promise<void>;
+
+export class RunRegistry {
+  private readonly history = new Map<string, RunEvent[]>();
+  private readonly listeners = new Map<string, Set<Listener>>();
+  private readonly finished = new Set<string>();
+
+  async publish(event: RunEvent): Promise<void> {
+    const events = this.history.get(event.runId) ?? [];
+    events.push(event);
+    this.history.set(event.runId, events);
+    if (event.type === "run.completed" || event.type === "run.failed")
+      this.finished.add(event.runId);
+    await Promise.all(
+      [...(this.listeners.get(event.runId) ?? [])].map((listener) =>
+        listener(event),
+      ),
+    );
+  }
+
+  events(runId: string): readonly RunEvent[] {
+    return this.history.get(runId) ?? [];
+  }
+  isFinished(runId: string): boolean {
+    return this.finished.has(runId);
+  }
+
+  subscribe(runId: string, listener: Listener): () => void {
+    const values = this.listeners.get(runId) ?? new Set<Listener>();
+    values.add(listener);
+    this.listeners.set(runId, values);
+    return () => values.delete(listener);
+  }
+}
diff --git a/apps/web-server/src/index.ts b/apps/web-server/src/index.ts
index ed3fe1f..637660c 100644
--- a/apps/web-server/src/index.ts
+++ b/apps/web-server/src/index.ts
@@ -1,14 +1,22 @@
 import { resolve } from "node:path";
 import {
   FileConversationRepository,
+  FileRunRepository,
   createDataLayout,
   ensureDataLayout,
 } from "@great-agent/local-data";
-import { ConversationService } from "@great-agent/agent-core";
+import {
+  AgentRunService,
+  ConversationService,
+  CoreError,
+  type ModelPort,
+} from "@great-agent/agent-core";
+import { DeepSeekModelAdapter } from "@great-agent/model-deepseek";
 import { createApp } from "./composition/create-app";
 import { createLogger } from "./composition/create-logger";
 import { mountStaticWeb } from "./composition/static-web";
 import { loadEnvironment } from "./config/environment";
+import { RunRegistry } from "./composition/run-registry";
 
 const environment = loadEnvironment();
 const logger = createLogger(environment.logLevel);
@@ -20,7 +28,31 @@ const conversations = new ConversationService({
   clock: { now: () => new Date() },
   ids: { create: () => crypto.randomUUID() },
 });
-const app = createApp(logger, conversations);
+const clock = { now: () => new Date() };
+const ids = { create: () => crypto.randomUUID() };
+const model: ModelPort = environment.deepSeekApiKey
+  ? new DeepSeekModelAdapter({
+      apiKey: environment.deepSeekApiKey,
+      baseURL: environment.deepSeekBaseUrl,
+      model: environment.deepSeekModel,
+    })
+  : {
+      async *stream() {
+        yield { type: "response.completed" as const };
+        throw new CoreError(
+          "MODEL_CONFIG_MISSING",
+          "尚未配置 DeepSeek API 密钥",
+        );
+      },
+    };
+const runs = new AgentRunService(
+  conversations,
+  model,
+  new FileRunRepository(layout),
+  clock,
+  ids,
+);
+const app = createApp(logger, conversations, runs, new RunRegistry());
 mountStaticWeb(app, resolve(import.meta.dir, "../../web/dist"));
 
 logger.info(
@@ -32,8 +64,10 @@ logger.info(
   "Great Agent 2 服务启动",
 );
 
-export default {
+const server = Bun.serve({
   hostname: environment.host,
   port: environment.port,
   fetch: app.fetch,
-};
+});
+
+logger.info({ url: server.url.href }, "Great Agent 2 已就绪");
diff --git a/apps/web-server/src/routes/conversations.test.ts b/apps/web-server/src/routes/conversations.test.ts
index 9521c7e..a3509a1 100644
--- a/apps/web-server/src/routes/conversations.test.ts
+++ b/apps/web-server/src/routes/conversations.test.ts
@@ -42,29 +42,14 @@ function createTestApp() {
 }
 
 describe("普通会话路由", () => {
-  test("首条消息创建会话并可读取", async () => {
+  test("会话路由只提供查询，消息必须通过 Run 创建", async () => {
     const app = createTestApp();
-    const created = await app.request("/api/conversations", {
+    expect(await (await app.request("/api/conversations")).json()).toEqual([]);
+    const directWrite = await app.request("/api/conversations", {
       method: "POST",
       headers: { "content-type": "application/json" },
       body: JSON.stringify({ content: "你好" }),
     });
-    expect(created.status).toBe(201);
-    const conversation = (await created.json()) as Conversation;
-    expect(
-      (await app.request(`/api/conversations/${conversation.id}`)).status,
-    ).toBe(200);
-    expect(await (await app.request("/api/conversations")).json()).toHaveLength(
-      1,
-    );
-  });
-
-  test("拒绝空消息", async () => {
-    const response = await createTestApp().request("/api/conversations", {
-      method: "POST",
-      headers: { "content-type": "application/json" },
-      body: JSON.stringify({ content: " " }),
-    });
-    expect(response.status).toBe(400);
+    expect(directWrite.status).toBe(404);
   });
 });
diff --git a/apps/web-server/src/routes/conversations.ts b/apps/web-server/src/routes/conversations.ts
index 25fa298..d46f3f9 100644
--- a/apps/web-server/src/routes/conversations.ts
+++ b/apps/web-server/src/routes/conversations.ts
@@ -1,6 +1,5 @@
 import { Hono } from "hono";
 import type { ConversationService } from "@great-agent/agent-core";
-import { messageInputSchema } from "@great-agent/web-contracts";
 
 export function createConversationRoutes(service: ConversationService): Hono {
   const routes = new Hono();
@@ -10,18 +9,5 @@ export function createConversationRoutes(service: ConversationService): Hono {
   routes.get("/conversations/:id", async (context) =>
     context.json(await service.getConversation(context.req.param("id"))),
   );
-  routes.post("/conversations", async (context) => {
-    const input = messageInputSchema.parse(await context.req.json());
-    return context.json(
-      await service.createWithFirstMessage(input.content),
-      201,
-    );
-  });
-  routes.post("/conversations/:id/messages", async (context) => {
-    const input = messageInputSchema.parse(await context.req.json());
-    return context.json(
-      await service.appendUserMessage(context.req.param("id"), input.content),
-    );
-  });
   return routes;
 }
diff --git a/apps/web-server/src/routes/runs.test.ts b/apps/web-server/src/routes/runs.test.ts
new file mode 100644
index 0000000..a4927d4
--- /dev/null
+++ b/apps/web-server/src/routes/runs.test.ts
@@ -0,0 +1,105 @@
+import { describe, expect, test } from "bun:test";
+import pino from "pino";
+import type {
+  AgentRun,
+  Conversation,
+  ConversationRepository,
+  ModelPort,
+  RunEvent,
+  RunRepository,
+} from "@great-agent/agent-core";
+import { AgentRunService, ConversationService } from "@great-agent/agent-core";
+import { createApp } from "../composition/create-app";
+import { RunRegistry } from "../composition/run-registry";
+
+class Conversations implements ConversationRepository {
+  value: Conversation | null = null;
+  async listRecent() {
+    return this.value ? [this.value] : [];
+  }
+  async getById(id: string) {
+    return this.value?.id === id ? this.value : null;
+  }
+  async create(value: Conversation) {
+    this.value = value;
+  }
+  async appendMessage(_id: string, message: Conversation["messages"][number]) {
+    if (!this.value) throw new Error("not found");
+    this.value = { ...this.value, messages: [...this.value.messages, message] };
+    return this.value;
+  }
+}
+
+class Runs implements RunRepository {
+  value: AgentRun | null = null;
+  events: RunEvent[] = [];
+  async create(run: AgentRun) {
+    this.value = run;
+  }
+  async update(run: AgentRun) {
+    this.value = run;
+  }
+  async getById(id: string) {
+    return this.value?.id === id ? this.value : null;
+  }
+  async appendEvent(event: RunEvent) {
+    this.events.push(event);
+  }
+  async listEvents(runId: string) {
+    return this.events.filter((event) => event.runId === runId);
+  }
+}
+
+describe("Run HTTP 与 SSE", () => {
+  test("启动普通 Run 并按顺序输出流式事件", async () => {
+    let id = 0;
+    const conversations = new Conversations();
+    const service = new ConversationService({
+      conversations,
+      clock: { now: () => new Date("2026-08-12T00:00:00.000Z") },
+      ids: { create: () => `id_${++id}` },
+    });
+    const model: ModelPort = {
+      async *stream() {
+        yield { type: "text.delta", delta: "流式" };
+        yield { type: "response.completed" };
+      },
+    };
+    const runs = new AgentRunService(
+      service,
+      model,
+      new Runs(),
+      { now: () => new Date("2026-08-12T00:00:00.000Z") },
+      { create: () => `id_${++id}` },
+    );
+    const app = createApp(
+      pino({ enabled: false }),
+      service,
+      runs,
+      new RunRegistry(),
+    );
+    const started = await app.request("/api/runs", {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ kind: "ordinary", message: "开始" }),
+    });
+    expect(started.status).toBe(202);
+    const body = (await started.json()) as {
+      runId: string;
+      conversationId: string;
+    };
+    const events = await app.request(`/api/runs/${body.runId}/events`);
+    const text = await events.text();
+    expect(events.status).toBe(200);
+    expect(text).toContain("event: message.delta");
+    expect(text).toContain("event: run.completed");
+    expect(
+      (await service.getConversation(body.conversationId)).messages.at(-1)
+        ?.content,
+    ).toBe("流式");
+    const conversation = await service.getConversation(body.conversationId);
+    const assistantMessage = conversation.messages.at(-1);
+    expect(assistantMessage?.runId).toBe(body.runId);
+    expect(text).toContain(`"messageId":"${assistantMessage?.id}"`);
+  });
+});
diff --git a/apps/web-server/src/routes/runs.ts b/apps/web-server/src/routes/runs.ts
new file mode 100644
index 0000000..c74fe9d
--- /dev/null
+++ b/apps/web-server/src/routes/runs.ts
@@ -0,0 +1,71 @@
+import { Hono } from "hono";
+import { streamSSE } from "hono/streaming";
+import type { AgentRunService, RunEvent } from "@great-agent/agent-core";
+import { startRunRequestSchema } from "@great-agent/web-contracts";
+import type { RunRegistry } from "../composition/run-registry";
+
+export function createRunRoutes(
+  service: AgentRunService,
+  registry: RunRegistry,
+): Hono {
+  const routes = new Hono();
+  routes.post("/runs", async (context) => {
+    const input = startRunRequestSchema.parse(await context.req.json());
+    const controller = new AbortController();
+    const started = await service.start(input, controller.signal);
+    void consume(started.events, registry);
+    return context.json(
+      {
+        conversationId: started.run.conversationId,
+        runId: started.run.id,
+        status: "running" as const,
+      },
+      202,
+    );
+  });
+  routes.get("/runs/:runId/events", (context) =>
+    streamSSE(context, async (stream) => {
+      const runId = context.req.param("runId");
+      for (const event of registry.events(runId))
+        await writeEvent(stream, event);
+      if (registry.isFinished(runId)) {
+        // EventSource needs the terminal event to reach the browser before the
+        // server closes a replay-only stream.
+        await stream.sleep(100);
+        return;
+      }
+      await new Promise<void>((resolve) => {
+        const unsubscribe = registry.subscribe(runId, async (event) => {
+          await writeEvent(stream, event);
+          if (event.type === "run.completed" || event.type === "run.failed") {
+            unsubscribe();
+            resolve();
+          }
+        });
+        stream.onAbort(() => {
+          unsubscribe();
+          resolve();
+        });
+      });
+    }),
+  );
+  return routes;
+}
+
+async function consume(
+  events: AsyncIterable<RunEvent>,
+  registry: RunRegistry,
+): Promise<void> {
+  for await (const event of events) await registry.publish(event);
+}
+
+async function writeEvent(
+  stream: Parameters<Parameters<typeof streamSSE>[1]>[0],
+  event: RunEvent,
+): Promise<void> {
+  await stream.writeSSE({
+    event: event.type,
+    id: String(event.sequence),
+    data: JSON.stringify(event),
+  });
+}
diff --git a/apps/web/src/api/conversations.ts b/apps/web/src/api/conversations.ts
index fef81b2..f8e2595 100644
--- a/apps/web/src/api/conversations.ts
+++ b/apps/web/src/api/conversations.ts
@@ -21,29 +21,6 @@ export async function getConversation(
   );
 }
 
-export async function createConversation(
-  content: string,
-): Promise<ConversationResponse> {
-  return conversationSchema.parse(
-    await request("/api/conversations", {
-      method: "POST",
-      body: JSON.stringify({ content }),
-    }),
-  );
-}
-
-export async function appendMessage(
-  id: string,
-  content: string,
-): Promise<ConversationResponse> {
-  return conversationSchema.parse(
-    await request(`/api/conversations/${encodeURIComponent(id)}/messages`, {
-      method: "POST",
-      body: JSON.stringify({ content }),
-    }),
-  );
-}
-
 async function request(path: string, init?: RequestInit): Promise<unknown> {
   const response = await fetch(path, {
     ...init,
diff --git a/apps/web/src/api/runs.ts b/apps/web/src/api/runs.ts
new file mode 100644
index 0000000..e8803eb
--- /dev/null
+++ b/apps/web/src/api/runs.ts
@@ -0,0 +1,77 @@
+import {
+  runEventSchema,
+  startedRunSchema,
+  type RunEventResponse,
+  type StartedRunResponse,
+} from "@great-agent/web-contracts";
+
+export type StartRunInput =
+  | { kind: "ordinary"; message: string }
+  | { kind: "existing"; conversationId: string; message: string };
+
+export async function startRun(
+  input: StartRunInput,
+): Promise<StartedRunResponse> {
+  const response = await fetch("/api/runs", {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify(input),
+  });
+  const value = await response.json();
+  if (!response.ok) throw new Error(readErrorMessage(value));
+  return startedRunSchema.parse(value);
+}
+
+export async function streamRun(
+  runId: string,
+  onEvent: (event: RunEventResponse) => void,
+): Promise<void> {
+  const response = await fetch(
+    `/api/runs/${encodeURIComponent(runId)}/events`,
+    { headers: { accept: "text/event-stream" } },
+  );
+  if (!response.ok || !response.body) throw new Error("流式连接中断");
+
+  const reader = response.body.getReader();
+  const decoder = new TextDecoder();
+  let buffer = "";
+  while (true) {
+    const { done, value } = await reader.read();
+    buffer += decoder.decode(value, { stream: !done }).replaceAll("\r\n", "\n");
+    const blocks = buffer.split("\n\n");
+    buffer = blocks.pop() ?? "";
+    for (const block of blocks) {
+      const data = block
+        .split("\n")
+        .filter((line) => line.startsWith("data:"))
+        .map((line) => line.slice(5).trimStart())
+        .join("\n");
+      if (!data) continue;
+      const event = runEventSchema.parse(JSON.parse(data));
+      onEvent(event);
+      if (event.type === "run.completed") return;
+      if (event.type === "run.failed")
+        throw new Error(readPayloadMessage(event.payload));
+    }
+    if (done) break;
+  }
+  throw new Error("流式连接提前结束");
+}
+
+function readErrorMessage(value: unknown): string {
+  if (typeof value === "object" && value && "error" in value) {
+    const error = value.error;
+    if (
+      typeof error === "object" &&
+      error &&
+      "message" in error &&
+      typeof error.message === "string"
+    )
+      return error.message;
+  }
+  return "无法启动 Agent 任务";
+}
+
+function readPayloadMessage(payload: Record<string, unknown>): string {
+  return typeof payload.message === "string" ? payload.message : "模型运行失败";
+}
diff --git a/apps/web/src/app/app-controller.ts b/apps/web/src/app/app-controller.ts
index ad61e96..b05db1f 100644
--- a/apps/web/src/app/app-controller.ts
+++ b/apps/web/src/app/app-controller.ts
@@ -3,12 +3,8 @@ import type {
   ConversationResponse,
   ConversationSummaryResponse,
 } from "@great-agent/web-contracts";
-import {
-  appendMessage,
-  createConversation,
-  getConversation,
-  listConversations,
-} from "../api/conversations";
+import { getConversation, listConversations } from "../api/conversations";
+import { startRun, streamRun } from "../api/runs";
 
 export type Selection =
   | { kind: "none" }
@@ -21,6 +17,7 @@ export type AppController = Readonly<{
   active: State<ConversationResponse | null>;
   loading: State<boolean>;
   sending: State<boolean>;
+  assistantDraft: State<string>;
   error: State<string>;
   initialize(): Promise<void>;
   startNewTask(): void;
@@ -34,6 +31,7 @@ export function createAppController(): AppController {
   const active = van.state<ConversationResponse | null>(null);
   const loading = van.state(false);
   const sending = van.state(false);
+  const assistantDraft = van.state("");
   const error = van.state("");
 
   async function initialize() {
@@ -70,16 +68,28 @@ export function createAppController(): AppController {
   async function send(content: string) {
     if (!content.trim() || sending.val) return;
     sending.val = true;
+    assistantDraft.val = "";
     error.val = "";
     try {
       const current = selection.val;
-      const conversation =
+      const started = await startRun(
         current.kind === "conversation"
-          ? await appendMessage(current.id, content)
-          : await createConversation(content);
-      active.val = conversation;
-      selection.val = { kind: "conversation", id: conversation.id };
+          ? { kind: "existing", conversationId: current.id, message: content }
+          : { kind: "ordinary", message: content },
+      );
+      active.val = await getConversation(started.conversationId);
+      selection.val = { kind: "conversation", id: started.conversationId };
       recent.val = await listConversations();
+      await streamRun(started.runId, (event) => {
+        if (
+          event.type === "message.delta" &&
+          typeof event.payload.delta === "string"
+        ) {
+          assistantDraft.val += event.payload.delta;
+        }
+      });
+      active.val = await getConversation(started.conversationId);
+      assistantDraft.val = "";
     } catch (cause) {
       error.val = readMessage(cause);
     } finally {
@@ -93,6 +103,7 @@ export function createAppController(): AppController {
     active,
     loading,
     sending,
+    assistantDraft,
     error,
     initialize,
     startNewTask,
diff --git a/apps/web/src/app/app-shell.css b/apps/web/src/app/app-shell.css
index b3f0662..c5fb996 100644
--- a/apps/web/src/app/app-shell.css
+++ b/apps/web/src/app/app-shell.css
@@ -1,7 +1,9 @@
 .app-shell {
   display: grid;
   grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
-  min-height: 100vh;
+  width: 100vw;
+  height: 100dvh;
+  overflow: hidden;
   background: var(--color-canvas);
 }
 
diff --git a/apps/web/src/features/conversations/conversation-pane.css b/apps/web/src/features/conversations/conversation-pane.css
index e79732a..8d47dee 100644
--- a/apps/web/src/features/conversations/conversation-pane.css
+++ b/apps/web/src/features/conversations/conversation-pane.css
@@ -1,12 +1,23 @@
 .main-pane {
   position: relative;
+  display: flex;
+  flex-direction: column;
   min-width: 0;
-  min-height: 100vh;
-  padding-bottom: 170px;
+  min-height: 0;
+  height: 100%;
+  overflow: hidden;
   background-color: var(--color-main);
   background-image: radial-gradient(#2e2e2c 0.65px, transparent 0.65px);
   background-size: 9px 9px;
 }
+.pane-content {
+  position: relative;
+  flex: 1 1 auto;
+  min-height: 0;
+  overflow-x: hidden;
+  overflow-y: auto;
+  scrollbar-gutter: stable;
+}
 .mobile-header {
   display: none;
 }
@@ -37,7 +48,7 @@
 .conversation-view {
   width: min(720px, calc(100% - 48px));
   margin: 0 auto;
-  padding: 55px 0 30px;
+  padding: 55px 0 42px;
 }
 .conversation-title {
   margin: 0 0 34px;
@@ -64,6 +75,20 @@
   font-size: 11px;
   font-weight: 700;
 }
+.assistant-role {
+  color: #ddd8cf;
+  background: #494641;
+}
+.message.streaming p::after {
+  display: inline-block;
+  width: 5px;
+  height: 14px;
+  margin-left: 3px;
+  background: var(--color-accent);
+  vertical-align: -2px;
+  animation: cursor-blink 1s steps(1) infinite;
+  content: "";
+}
 .message p {
   margin: 2px 0 0;
   color: #e1ded8;
@@ -72,12 +97,10 @@
   white-space: pre-wrap;
 }
 .composer-wrap {
-  position: fixed;
-  right: 0;
-  bottom: 18px;
-  left: var(--sidebar-width);
-  width: min(var(--composer-width), calc(100% - 236px));
-  margin: 0 auto;
+  z-index: 1;
+  flex: 0 0 auto;
+  width: min(var(--composer-width), calc(100% - 40px));
+  margin: 0 auto 18px;
 }
 .composer {
   min-height: 84px;
@@ -154,15 +177,21 @@
   font-size: 11px;
 }
 
+@keyframes cursor-blink {
+  50% {
+    opacity: 0;
+  }
+}
+
 @media (max-width: 700px) {
   .mobile-header {
     display: block;
+    flex: 0 0 auto;
     padding: 14px 16px;
     border-bottom: 1px solid #323230;
     font-size: 13px;
   }
   .composer-wrap {
-    left: 0;
     width: calc(100% - 24px);
   }
   .conversation-view {
diff --git a/apps/web/src/features/conversations/conversation-pane.ts b/apps/web/src/features/conversations/conversation-pane.ts
index 7d3fe98..6eda657 100644
--- a/apps/web/src/features/conversations/conversation-pane.ts
+++ b/apps/web/src/features/conversations/conversation-pane.ts
@@ -11,13 +11,13 @@ export function ConversationPane(controller: AppController): HTMLElement {
     const content = draft.val;
     if (!content.trim()) return;
     await controller.send(content);
-    if (!controller.error.val) draft.val = "";
+    draft.val = "";
   }
 
   return main(
     { class: "main-pane" },
     header({ class: "mobile-header" }, "Great Agent 2"),
-    () =>
+    div({ class: "pane-content" }, () =>
       controller.selection.val.kind === "conversation" && controller.active.val
         ? div(
             { class: "conversation-view" },
@@ -27,10 +27,21 @@ export function ConversationPane(controller: AppController): HTMLElement {
               controller.active.val.messages.map((message) =>
                 article(
                   { class: `message ${message.role}` },
-                  span({ class: "message-role" }, "你"),
+                  span(
+                    { class: `message-role ${message.role}-role` },
+                    message.role === "user" ? "你" : "G",
+                  ),
                   p(message.content),
                 ),
               ),
+              () =>
+                controller.assistantDraft.val
+                  ? article(
+                      { class: "message assistant streaming" },
+                      span({ class: "message-role assistant-role" }, "G"),
+                      p(controller.assistantDraft),
+                    )
+                  : null,
             ),
           )
         : div(
@@ -38,6 +49,7 @@ export function ConversationPane(controller: AppController): HTMLElement {
             h1(span({ class: "spark" }, "✳"), " 今天想完成什么？"),
             p("从一个问题、想法或具体任务开始。"),
           ),
+    ),
     Composer(controller, draft, submit),
   );
 }
@@ -49,10 +61,14 @@ function Composer(
 ): HTMLElement {
   return div(
     { class: "composer-wrap" },
-    () =>
-      controller.error.val
-        ? div({ class: "error-banner", role: "alert" }, controller.error.val)
-        : null,
+    div(
+      {
+        class: "error-banner",
+        role: "alert",
+        hidden: () => !controller.error.val,
+      },
+      () => controller.error.val,
+    ),
     div(
       { class: "composer" },
       textarea({
diff --git a/apps/web/src/features/conversations/sidebar.css b/apps/web/src/features/conversations/sidebar.css
index bf1d9f9..0fb4d0e 100644
--- a/apps/web/src/features/conversations/sidebar.css
+++ b/apps/web/src/features/conversations/sidebar.css
@@ -2,11 +2,21 @@
   position: relative;
   display: flex;
   flex-direction: column;
-  min-height: 100vh;
+  min-width: 0;
+  min-height: 0;
+  height: 100%;
+  overflow: hidden;
   padding: 10px 7px;
   border-right: 1px solid #323230;
   background: var(--color-sidebar);
 }
+.sidebar-scroll {
+  flex: 1 1 auto;
+  min-height: 0;
+  overflow-x: hidden;
+  overflow-y: auto;
+  scrollbar-gutter: stable;
+}
 
 .window-controls {
   display: flex;
@@ -106,6 +116,7 @@
 }
 .sidebar-footer {
   display: flex;
+  flex: 0 0 auto;
   gap: 9px;
   align-items: center;
   margin-top: auto;
diff --git a/apps/web/src/features/conversations/sidebar.ts b/apps/web/src/features/conversations/sidebar.ts
index 693af0c..fb74d59 100644
--- a/apps/web/src/features/conversations/sidebar.ts
+++ b/apps/web/src/features/conversations/sidebar.ts
@@ -19,8 +19,7 @@ export function Sidebar(controller: AppController): HTMLElement {
       "新任务",
     ),
     button({ class: "nav-item", disabled: true }, "▣", " 项目"),
-    h2("最近"),
-    () =>
+    div({ class: "sidebar-scroll" }, h2("最近"), () =>
       controller.loading.val && controller.recent.val.length === 0
         ? div({ class: "sidebar-empty" }, "正在加载…")
         : controller.recent.val.length === 0
@@ -36,6 +35,7 @@ export function Sidebar(controller: AppController): HTMLElement {
                 ),
               ),
             ),
+    ),
     div(
       { class: "sidebar-footer" },
       span({ class: "avatar" }, "G"),
diff --git a/apps/web/src/styles/global.css b/apps/web/src/styles/global.css
index 899af1d..fafef92 100644
--- a/apps/web/src/styles/global.css
+++ b/apps/web/src/styles/global.css
@@ -2,11 +2,39 @@
 
 * {
   box-sizing: border-box;
+  scrollbar-color: var(--color-scrollbar-thumb) transparent;
+  scrollbar-width: thin;
+}
+
+*::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+*::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+*::-webkit-scrollbar-thumb {
+  border: 2px solid transparent;
+  border-radius: 999px;
+  background: var(--color-scrollbar-thumb);
+  background-clip: padding-box;
+}
+
+*::-webkit-scrollbar-thumb:hover {
+  background: var(--color-scrollbar-thumb-hover);
+  background-clip: padding-box;
+}
+
+html,
+body {
+  height: 100%;
+  overflow: hidden;
 }
 
 body {
   min-width: 320px;
-  min-height: 100vh;
   margin: 0;
   color: var(--color-text-primary);
   background: var(--color-canvas);
@@ -14,6 +42,10 @@ body {
   font-synthesis: none;
 }
 
+#app {
+  height: 100%;
+}
+
 button,
 textarea {
   color: inherit;
diff --git a/apps/web/src/styles/tokens.css b/apps/web/src/styles/tokens.css
index 798f115..26aadf2 100644
--- a/apps/web/src/styles/tokens.css
+++ b/apps/web/src/styles/tokens.css
@@ -8,6 +8,8 @@
   --color-text-primary: #e8e5df;
   --color-text-secondary: #8a8781;
   --color-accent: #cf785e;
+  --color-scrollbar-thumb: #4b4945;
+  --color-scrollbar-thumb-hover: #66635d;
   --sidebar-width: 196px;
   --composer-width: 460px;
   --font-sans:
diff --git a/docs/FEATURES.md b/docs/FEATURES.md
index 87cefba..6d3ca9f 100644
--- a/docs/FEATURES.md
+++ b/docs/FEATURES.md
@@ -11,7 +11,7 @@
 
 ### F-001——应用外壳、首次状态与普通会话
 
-- 状态：待用户查看（自动化开发验证已完成）
+- 状态：已完成（用户于 2026-08-12 审核通过）
 - 用户可见结果：首次进入看到“最近”和“项目”空状态及右侧对话引导；点击“新任务”不会创建空会话，发送首条有效消息后普通会话出现，选择历史会话可还原消息并继续输入。
 - 页面与交互：Claude Desktop 风格三栏外壳、空状态、对话引导、新任务草稿、普通历史会话、输入校验、加载与保存失败状态。
 - 服务或接口：普通会话列表、会话详情、首条消息原子创建会话、已有会话追加用户消息。
@@ -28,8 +28,22 @@
 
 ### F-002——Agent Core 与 DeepSeek 流式回复
 
-- 状态：待开始；F-001 获得用户确认后才能开始
-- 用户可见结果：普通会话获得真实 DeepSeek 流式回复并可连续聊天。
+- 状态：待用户查看
+- 用户可见结果：普通会话可启动 Agent Run，DeepSeek 回复增量显示，完成后的助手消息写入本地会话并可继续聊天；未配置模型密钥时保留用户消息并显示明确错误。
+- Agent Core：新增独立于 HTTP 的 `AgentRunService`、Run/RunEvent 领域对象、`ModelPort` 与 `RunRepository`；模型增量、完成和失败均转为稳定的领域事件。
+- DeepSeek 接入：`model-deepseek` 在适配器内部映射 OpenAI 兼容协议，Core 只依赖自身 Message/ModelEvent 类型；首个模型固定为 DeepSeek。
+- 服务与流式协议：新增 `POST /api/runs` 和 `GET /api/runs/:runId/events`；事件按序包含 Run 开始、消息开始/增量/完成及 Run 完成/失败。前端使用基于 `fetch` 的 SSE 读取，兼容不提供原生 `EventSource` 的 WebView。
+- 数据持久化：每次运行保存 `run.json` 和有序 `events.ndjson`；成功后助手消息写入真实本地 Conversation 文件，失败后保存稳定失败终态和错误代码。
+- 轮次关联：每条用户和助手消息都必须保存 `runId`；Run 使用 `triggerMessageId` 指向触发本轮运行的用户消息，并复用流式 `message.started` 给出的助手 `messageId`，因此运行、触发消息、流式事件和最终消息可以稳定互查。会话写接口只提供查询，新增消息必须通过 Run 用例，避免产生没有 Run 的孤立消息。“第几回合”由用户消息顺序计算，不持久化易失序号；重试链 `retryOfRunId` 仍在 F-005 实现。
+- 页面与交互：发送消息后进入运行状态、实时拼接助手草稿、完成后读取持久化消息；模型配置缺失时显示“尚未配置 DeepSeek API 密钥”，输入恢复可用且不丢失已提交的用户消息。
+- 异常状态：模型密钥缺失保留具体可行动提示；其他模型异常对外收敛为“模型服务暂时不可用”，不泄露供应商原始错误或密钥。
+- 自动化测试：Agent Core 成功/失败和轮次关联、文件 Run Repository、HTTP 与 SSE 消息标识一致性、禁止绕过 Run 直接写消息及原有回归共 13 个测试、43 个断言，全部通过。
+- 验证命令与结果：`bun run format:check`、`bun run lint`、`bun run typecheck`、`bun run check:file-size`、`bun run check:architecture`、`bun test`、`bun run build` 全部通过。
+- 人工验证步骤：以空临时数据目录和未配置 DeepSeek 密钥启动生产构建；发送“最终失败链路验收”；检查用户消息、错误提示、输入恢复以及 Run 事件文件和失败摘要。
+- 人工操作结果：2026-08-12 使用本机应用内浏览器完成；页面准确显示模型密钥缺失提示，输入恢复，用户消息保留；`events.ndjson` 依次写入 `run.started`、`message.started`、`run.failed`，`run.json` 状态为 `failed`。
+- 查看阶段修改：根据用户反馈将应用外壳锁定为浏览器可视区高度；页面根节点不再滚动，侧栏仅“最近”区域内部滚动，ConversationPane 仅消息内容区内部滚动，顶部操作、侧栏底部信息和输入组件保持固定。2026-08-13 在 1280×720 视口验证根页面高度与视口一致且无页面滚动，两个内容区均为独立 `overflow-y: auto` 容器。
+- 视觉参考：失败状态验收截图保存为 `docs/visual-reference/f002-model-config-error.jpg`。
+- 已知限制：真实 DeepSeek 成功调用需要用户在运行环境提供自己的密钥；自动化和本次人工验收未使用或读取真实密钥。停止与重试留在 F-005，服务重启后的事件重放加固留在 F-010。
 - 主要验收：AC-004、AC-010、AC-014、AC-016。
 
 ### F-003——项目管理与项目聊天
diff --git a/docs/visual-reference/f002-model-config-error.jpg b/docs/visual-reference/f002-model-config-error.jpg
new file mode 100644
index 0000000..ab07a3c
Binary files /dev/null and b/docs/visual-reference/f002-model-config-error.jpg differ
diff --git a/packages/agent-core/src/domain/agent-run.ts b/packages/agent-core/src/domain/agent-run.ts
new file mode 100644
index 0000000..dd789f2
--- /dev/null
+++ b/packages/agent-core/src/domain/agent-run.ts
@@ -0,0 +1,25 @@
+export type AgentRunStatus = "running" | "completed" | "failed";
+
+export type AgentRun = Readonly<{
+  id: string;
+  conversationId: string;
+  triggerMessageId: string;
+  status: AgentRunStatus;
+  createdAt: string;
+  updatedAt: string;
+  errorCode?: string;
+}>;
+
+export type RunEvent = Readonly<{
+  runId: string;
+  sequence: number;
+  timestamp: string;
+  type:
+    | "run.started"
+    | "message.started"
+    | "message.delta"
+    | "message.completed"
+    | "run.completed"
+    | "run.failed";
+  payload: Record<string, unknown>;
+}>;
diff --git a/packages/agent-core/src/domain/conversation.ts b/packages/agent-core/src/domain/conversation.ts
index eb8c131..4075e17 100644
--- a/packages/agent-core/src/domain/conversation.ts
+++ b/packages/agent-core/src/domain/conversation.ts
@@ -5,6 +5,7 @@ export type Message = Readonly<{
   role: MessageRole;
   content: string;
   createdAt: string;
+  runId: string;
 }>;
 
 export type Conversation = Readonly<{
diff --git a/packages/agent-core/src/index.ts b/packages/agent-core/src/index.ts
index 60d43d9..82e9b61 100644
--- a/packages/agent-core/src/index.ts
+++ b/packages/agent-core/src/index.ts
@@ -5,8 +5,10 @@ export type {
   Message,
   MessageRole,
 } from "./domain/conversation";
+export type { AgentRun, AgentRunStatus, RunEvent } from "./domain/agent-run";
 export type { ConversationRepository } from "./ports/conversation-repository";
 export type { ModelEvent, ModelPort, ModelRequest } from "./ports/model-port";
+export type { RunRepository } from "./ports/run-repository";
 export type {
   ClockPort,
   IdPort,
@@ -16,3 +18,8 @@ export {
   ConversationService,
   type ConversationServiceDependencies,
 } from "./use-cases/conversation-service";
+export {
+  AgentRunService,
+  type StartedRun,
+  type StartRunInput,
+} from "./use-cases/agent-run-service";
diff --git a/packages/agent-core/src/ports/model-port.ts b/packages/agent-core/src/ports/model-port.ts
index b03728c..9a714fe 100644
--- a/packages/agent-core/src/ports/model-port.ts
+++ b/packages/agent-core/src/ports/model-port.ts
@@ -1,12 +1,13 @@
+import type { Message } from "../domain/conversation";
+
 export type ModelRequest = Readonly<{
   model: string;
-  messages: readonly unknown[];
+  messages: readonly Message[];
 }>;
 
-export type ModelEvent = Readonly<{
-  type: string;
-  payload: unknown;
-}>;
+export type ModelEvent =
+  | Readonly<{ type: "text.delta"; delta: string }>
+  | Readonly<{ type: "response.completed" }>;
 
 export interface ModelPort {
   stream(request: ModelRequest, signal: AbortSignal): AsyncIterable<ModelEvent>;
diff --git a/packages/agent-core/src/ports/run-repository.ts b/packages/agent-core/src/ports/run-repository.ts
new file mode 100644
index 0000000..f1144d1
--- /dev/null
+++ b/packages/agent-core/src/ports/run-repository.ts
@@ -0,0 +1,9 @@
+import type { AgentRun, RunEvent } from "../domain/agent-run";
+
+export interface RunRepository {
+  create(run: AgentRun): Promise<void>;
+  update(run: AgentRun): Promise<void>;
+  getById(id: string): Promise<AgentRun | null>;
+  appendEvent(event: RunEvent): Promise<void>;
+  listEvents(runId: string): Promise<readonly RunEvent[]>;
+}
diff --git a/packages/agent-core/src/use-cases/agent-run-service.test.ts b/packages/agent-core/src/use-cases/agent-run-service.test.ts
new file mode 100644
index 0000000..64c72bd
--- /dev/null
+++ b/packages/agent-core/src/use-cases/agent-run-service.test.ts
@@ -0,0 +1,144 @@
+import { describe, expect, test } from "bun:test";
+import type {
+  AgentRun,
+  Conversation,
+  ConversationRepository,
+  ModelPort,
+  RunEvent,
+  RunRepository,
+} from "..";
+import { AgentRunService, ConversationService } from "..";
+
+class MemoryConversationRepository implements ConversationRepository {
+  readonly values = new Map<string, Conversation>();
+  async listRecent() {
+    return [...this.values.values()];
+  }
+  async getById(id: string) {
+    return this.values.get(id) ?? null;
+  }
+  async create(value: Conversation) {
+    this.values.set(value.id, value);
+  }
+  async appendMessage(id: string, message: Conversation["messages"][number]) {
+    const current = this.values.get(id);
+    if (!current) throw new Error("not found");
+    const next = {
+      ...current,
+      messages: [...current.messages, message],
+      updatedAt: message.createdAt,
+    };
+    this.values.set(id, next);
+    return next;
+  }
+}
+
+class MemoryRunRepository implements RunRepository {
+  value: AgentRun | null = null;
+  readonly events: RunEvent[] = [];
+  async create(run: AgentRun) {
+    this.value = run;
+  }
+  async update(run: AgentRun) {
+    this.value = run;
+  }
+  async getById(id: string) {
+    return this.value?.id === id ? this.value : null;
+  }
+  async appendEvent(event: RunEvent) {
+    this.events.push(event);
+  }
+  async listEvents(runId: string) {
+    return this.events.filter((event) => event.runId === runId);
+  }
+}
+
+describe("AgentRunService", () => {
+  test("不依赖 HTTP 完成一次流式运行并持久化助手消息", async () => {
+    let nextId = 0;
+    const conversations = new MemoryConversationRepository();
+    const conversationService = new ConversationService({
+      conversations,
+      clock: { now: () => new Date("2026-08-12T00:00:00.000Z") },
+      ids: { create: () => `id_${++nextId}` },
+    });
+    const model: ModelPort = {
+      async *stream() {
+        yield { type: "text.delta", delta: "你" };
+        yield { type: "text.delta", delta: "好" };
+        yield { type: "response.completed" };
+      },
+    };
+    const runs = new MemoryRunRepository();
+    const service = new AgentRunService(
+      conversationService,
+      model,
+      runs,
+      { now: () => new Date("2026-08-12T00:00:00.000Z") },
+      { create: () => `id_${++nextId}` },
+    );
+    const started = await service.start(
+      { kind: "ordinary", message: "开始" },
+      new AbortController().signal,
+    );
+    const events: RunEvent[] = [];
+    for await (const event of started.events) events.push(event);
+    expect(events.map((event) => event.type)).toEqual([
+      "run.started",
+      "message.started",
+      "message.delta",
+      "message.delta",
+      "message.completed",
+      "run.completed",
+    ]);
+    expect(runs.value?.status).toBe("completed");
+    const conversation = await conversationService.getConversation(
+      started.run.conversationId,
+    );
+    const assistantMessage = conversation.messages.at(-1);
+    const startedMessageId = events.find(
+      (event) => event.type === "message.started",
+    )?.payload.messageId as string | undefined;
+    expect(conversation.messages[0]?.id).toBe(started.run.triggerMessageId);
+    expect(conversation.messages[0]?.runId).toBe(started.run.id);
+    expect(assistantMessage?.content).toBe("你好");
+    expect(assistantMessage?.runId).toBe(started.run.id);
+    expect(assistantMessage?.id).toBe(startedMessageId);
+  });
+
+  test("模型失败形成稳定失败终态", async () => {
+    const conversations = new MemoryConversationRepository();
+    let id = 0;
+    const conversationService = new ConversationService({
+      conversations,
+      clock: { now: () => new Date() },
+      ids: { create: () => `id_${++id}` },
+    });
+    const model: ModelPort = {
+      async *stream() {
+        yield { type: "response.completed" };
+        throw new Error("secret provider error");
+      },
+    };
+    const runs = new MemoryRunRepository();
+    const service = new AgentRunService(
+      conversationService,
+      model,
+      runs,
+      { now: () => new Date() },
+      { create: () => `id_${++id}` },
+    );
+    const started = await service.start(
+      { kind: "ordinary", message: "开始" },
+      new AbortController().signal,
+    );
+    const events: RunEvent[] = [];
+    for await (const event of started.events) events.push(event);
+    expect(events.at(-1)?.type).toBe("run.failed");
+    expect(events.at(-1)?.payload.message).toBe("模型服务暂时不可用");
+    expect(
+      (await conversationService.getConversation(started.run.conversationId))
+        .messages[0]?.id,
+    ).toBe(started.run.triggerMessageId);
+  });
+});
diff --git a/packages/agent-core/src/use-cases/agent-run-service.ts b/packages/agent-core/src/use-cases/agent-run-service.ts
new file mode 100644
index 0000000..c511250
--- /dev/null
+++ b/packages/agent-core/src/use-cases/agent-run-service.ts
@@ -0,0 +1,124 @@
+import type { AgentRun, RunEvent } from "../domain/agent-run";
+import { CoreError } from "../errors/core-error";
+import type { ModelPort } from "../ports/model-port";
+import type { RunRepository } from "../ports/run-repository";
+import type { ClockPort, IdPort } from "../ports/system-ports";
+import type { ConversationService } from "./conversation-service";
+
+export type StartRunInput =
+  | Readonly<{ kind: "ordinary"; message: string }>
+  | Readonly<{ kind: "existing"; conversationId: string; message: string }>;
+
+export type StartedRun = Readonly<{
+  run: AgentRun;
+  events: AsyncIterable<RunEvent>;
+}>;
+
+export class AgentRunService {
+  constructor(
+    private readonly conversations: ConversationService,
+    private readonly model: ModelPort,
+    private readonly runs: RunRepository,
+    private readonly clock: ClockPort,
+    private readonly ids: IdPort,
+  ) {}
+
+  async start(input: StartRunInput, signal: AbortSignal): Promise<StartedRun> {
+    const runId = this.ids.create();
+    const conversation =
+      input.kind === "ordinary"
+        ? await this.conversations.createWithFirstMessage(input.message, runId)
+        : await this.conversations.appendUserMessage(
+            input.conversationId,
+            input.message,
+            runId,
+          );
+    const timestamp = this.clock.now().toISOString();
+    const triggerMessage = conversation.messages.at(-1);
+    if (triggerMessage?.role !== "user")
+      throw new CoreError("RUN_TRIGGER_INVALID", "无法确定本次运行的用户消息");
+    const run: AgentRun = {
+      id: runId,
+      conversationId: conversation.id,
+      triggerMessageId: triggerMessage.id,
+      status: "running",
+      createdAt: timestamp,
+      updatedAt: timestamp,
+    };
+    await this.runs.create(run);
+    return { run, events: this.execute(run, signal) };
+  }
+
+  private async *execute(
+    run: AgentRun,
+    signal: AbortSignal,
+  ): AsyncIterable<RunEvent> {
+    let sequence = 0;
+    const event = async (
+      type: RunEvent["type"],
+      payload: Record<string, unknown>,
+    ) => {
+      const value: RunEvent = {
+        runId: run.id,
+        sequence: ++sequence,
+        timestamp: this.clock.now().toISOString(),
+        type,
+        payload,
+      };
+      await this.runs.appendEvent(value);
+      return value;
+    };
+    try {
+      yield await event("run.started", { conversationId: run.conversationId });
+      const messageId = this.ids.create();
+      yield await event("message.started", { messageId });
+      const conversation = await this.conversations.getConversation(
+        run.conversationId,
+      );
+      let content = "";
+      for await (const modelEvent of this.model.stream(
+        { model: "default", messages: conversation.messages },
+        signal,
+      )) {
+        if (modelEvent.type !== "text.delta") continue;
+        content += modelEvent.delta;
+        yield await event("message.delta", {
+          messageId,
+          delta: modelEvent.delta,
+        });
+      }
+      if (!content)
+        throw new CoreError("MODEL_RESPONSE_INVALID", "模型没有返回有效内容");
+      await this.conversations.appendAssistantMessage(
+        run.conversationId,
+        messageId,
+        run.id,
+        content,
+      );
+      yield await event("message.completed", { messageId, content });
+      await this.runs.update({
+        ...run,
+        status: "completed",
+        updatedAt: this.clock.now().toISOString(),
+      });
+      yield await event("run.completed", {});
+    } catch (cause) {
+      const code =
+        cause instanceof CoreError ? cause.code : "MODEL_UNAVAILABLE";
+      await this.runs.update({
+        ...run,
+        status: "failed",
+        errorCode: code,
+        updatedAt: this.clock.now().toISOString(),
+      });
+      yield await event("run.failed", {
+        code,
+        message: safeErrorMessage(cause),
+      });
+    }
+  }
+}
+
+function safeErrorMessage(cause: unknown): string {
+  return cause instanceof CoreError ? cause.message : "模型服务暂时不可用";
+}
diff --git a/packages/agent-core/src/use-cases/conversation-service.test.ts b/packages/agent-core/src/use-cases/conversation-service.test.ts
index 7947905..d111ad2 100644
--- a/packages/agent-core/src/use-cases/conversation-service.test.ts
+++ b/packages/agent-core/src/use-cases/conversation-service.test.ts
@@ -39,9 +39,13 @@ describe("ConversationService", () => {
       clock: { now: () => new Date("2026-08-12T00:00:00.000Z") },
       ids: { create: () => `id_${++nextId}` },
     });
-    const created = await service.createWithFirstMessage("  第一次对话  ");
+    const created = await service.createWithFirstMessage(
+      "  第一次对话  ",
+      "run_1",
+    );
     expect(created.projectId).toBeNull();
     expect(created.messages[0]?.content).toBe("第一次对话");
+    expect(created.messages[0]?.runId).toBe("run_1");
     expect(await service.listRecent()).toHaveLength(1);
   });
 
@@ -52,9 +56,9 @@ describe("ConversationService", () => {
       clock: { now: () => new Date() },
       ids: { create: () => "unused" },
     });
-    expect(service.createWithFirstMessage(" \n ")).rejects.toMatchObject({
-      code: "MESSAGE_EMPTY",
-    });
+    expect(
+      service.createWithFirstMessage(" \n ", "run_1"),
+    ).rejects.toMatchObject({ code: "MESSAGE_EMPTY" });
     expect(conversations.values.size).toBe(0);
   });
 });
diff --git a/packages/agent-core/src/use-cases/conversation-service.ts b/packages/agent-core/src/use-cases/conversation-service.ts
index 9221809..58111ec 100644
--- a/packages/agent-core/src/use-cases/conversation-service.ts
+++ b/packages/agent-core/src/use-cases/conversation-service.ts
@@ -27,14 +27,17 @@ export class ConversationService {
     return conversation;
   }
 
-  async createWithFirstMessage(content: string): Promise<Conversation> {
+  async createWithFirstMessage(
+    content: string,
+    runId: string,
+  ): Promise<Conversation> {
     const normalized = normalizeContent(content);
     const timestamp = this.dependencies.clock.now().toISOString();
     const conversation: Conversation = {
       id: this.dependencies.ids.create(),
       projectId: null,
       title: createTitle(normalized),
-      messages: [this.createUserMessage(normalized, timestamp)],
+      messages: [this.createUserMessage(normalized, timestamp, runId)],
       createdAt: timestamp,
       updatedAt: timestamp,
     };
@@ -42,7 +45,11 @@ export class ConversationService {
     return conversation;
   }
 
-  async appendUserMessage(id: string, content: string): Promise<Conversation> {
+  async appendUserMessage(
+    id: string,
+    content: string,
+    runId: string,
+  ): Promise<Conversation> {
     const normalized = normalizeContent(content);
     await this.getConversation(id);
     return this.dependencies.conversations.appendMessage(
@@ -50,16 +57,38 @@ export class ConversationService {
       this.createUserMessage(
         normalized,
         this.dependencies.clock.now().toISOString(),
+        runId,
       ),
     );
   }
 
-  private createUserMessage(content: string, createdAt: string): Message {
+  async appendAssistantMessage(
+    id: string,
+    messageId: string,
+    runId: string,
+    content: string,
+  ): Promise<Conversation> {
+    await this.getConversation(id);
+    return this.dependencies.conversations.appendMessage(id, {
+      id: messageId,
+      role: "assistant",
+      content,
+      createdAt: this.dependencies.clock.now().toISOString(),
+      runId,
+    });
+  }
+
+  private createUserMessage(
+    content: string,
+    createdAt: string,
+    runId: string,
+  ): Message {
     return {
       id: this.dependencies.ids.create(),
       role: "user",
       content,
       createdAt,
+      runId,
     };
   }
 }
diff --git a/packages/local-data/src/index.ts b/packages/local-data/src/index.ts
index 9809766..2265e0d 100644
--- a/packages/local-data/src/index.ts
+++ b/packages/local-data/src/index.ts
@@ -7,3 +7,4 @@ export {
   type DataLayout,
 } from "./layout/data-layout";
 export { FileConversationRepository } from "./repositories/file-conversation-repository";
+export { FileRunRepository } from "./repositories/file-run-repository";
diff --git a/packages/local-data/src/repositories/file-conversation-repository.test.ts b/packages/local-data/src/repositories/file-conversation-repository.test.ts
index af67202..6730c53 100644
--- a/packages/local-data/src/repositories/file-conversation-repository.test.ts
+++ b/packages/local-data/src/repositories/file-conversation-repository.test.ts
@@ -32,6 +32,7 @@ describe("FileConversationRepository", () => {
       role: "user",
       content: "你好",
       createdAt: "2026-08-12T01:00:00.000Z",
+      runId: "run_1",
     });
     expect((await repository.listRecent())[0]?.updatedAt).toBe(
       "2026-08-12T01:00:00.000Z",
diff --git a/packages/local-data/src/repositories/file-run-repository.test.ts b/packages/local-data/src/repositories/file-run-repository.test.ts
new file mode 100644
index 0000000..3382974
--- /dev/null
+++ b/packages/local-data/src/repositories/file-run-repository.test.ts
@@ -0,0 +1,45 @@
+import { afterEach, describe, expect, test } from "bun:test";
+import { mkdtemp, rm } from "node:fs/promises";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+import type { AgentRun, RunEvent } from "@great-agent/agent-core";
+import { createDataLayout, ensureDataLayout } from "../layout/data-layout";
+import { FileRunRepository } from "./file-run-repository";
+
+let root: string | undefined;
+afterEach(async () => {
+  if (root) await rm(root, { recursive: true, force: true });
+  root = undefined;
+});
+
+describe("FileRunRepository", () => {
+  test("持久化运行摘要和有序事件", async () => {
+    root = await mkdtemp(join(tmpdir(), "great-agent2-runs-"));
+    const layout = createDataLayout(root);
+    await ensureDataLayout(layout);
+    const repository = new FileRunRepository(layout);
+    const run: AgentRun = {
+      id: "run_1",
+      conversationId: "conversation_1",
+      triggerMessageId: "message_1",
+      status: "running",
+      createdAt: "2026-08-12T00:00:00.000Z",
+      updatedAt: "2026-08-12T00:00:00.000Z",
+    };
+    const event: RunEvent = {
+      runId: run.id,
+      sequence: 1,
+      timestamp: run.createdAt,
+      type: "run.started",
+      payload: { conversationId: run.conversationId },
+    };
+    await repository.create(run);
+    await repository.appendEvent(event);
+    await repository.update({ ...run, status: "completed" });
+    expect((await repository.getById(run.id))?.status).toBe("completed");
+    expect((await repository.getById(run.id))?.triggerMessageId).toBe(
+      "message_1",
+    );
+    expect(await repository.listEvents(run.id)).toEqual([event]);
+  });
+});
diff --git a/packages/local-data/src/repositories/file-run-repository.ts b/packages/local-data/src/repositories/file-run-repository.ts
new file mode 100644
index 0000000..f5f5bc4
--- /dev/null
+++ b/packages/local-data/src/repositories/file-run-repository.ts
@@ -0,0 +1,64 @@
+import { mkdir, readFile } from "node:fs/promises";
+import { join } from "node:path";
+import type {
+  AgentRun,
+  RunEvent,
+  RunRepository,
+} from "@great-agent/agent-core";
+import { appendNdjson } from "../atomic-writes/append-ndjson";
+import { writeJsonAtomically } from "../atomic-writes/write-json-atomically";
+import type { DataLayout } from "../layout/data-layout";
+
+export class FileRunRepository implements RunRepository {
+  constructor(private readonly layout: DataLayout) {}
+
+  async create(run: AgentRun): Promise<void> {
+    await this.update(run);
+  }
+
+  async update(run: AgentRun): Promise<void> {
+    await mkdir(this.runDirectory(run.id), { recursive: true });
+    await writeJsonAtomically(this.summaryPath(run.id), run);
+  }
+
+  async getById(id: string): Promise<AgentRun | null> {
+    try {
+      return JSON.parse(
+        await readFile(this.summaryPath(id), "utf8"),
+      ) as AgentRun;
+    } catch (error) {
+      if (error instanceof Error && "code" in error && error.code === "ENOENT")
+        return null;
+      throw error;
+    }
+  }
+
+  async appendEvent(event: RunEvent): Promise<void> {
+    await appendNdjson(this.eventsPath(event.runId), event);
+  }
+
+  async listEvents(runId: string): Promise<readonly RunEvent[]> {
+    try {
+      const text = await readFile(this.eventsPath(runId), "utf8");
+      return text
+        .trim()
+        .split("\n")
+        .filter(Boolean)
+        .map((line) => JSON.parse(line) as RunEvent);
+    } catch (error) {
+      if (error instanceof Error && "code" in error && error.code === "ENOENT")
+        return [];
+      throw error;
+    }
+  }
+
+  private runDirectory(id: string) {
+    return join(this.layout.runs, id);
+  }
+  private summaryPath(id: string) {
+    return join(this.runDirectory(id), "run.json");
+  }
+  private eventsPath(id: string) {
+    return join(this.runDirectory(id), "events.ndjson");
+  }
+}
diff --git a/packages/model-deepseek/src/adapter/deepseek-model-adapter.ts b/packages/model-deepseek/src/adapter/deepseek-model-adapter.ts
new file mode 100644
index 0000000..e7cdb16
--- /dev/null
+++ b/packages/model-deepseek/src/adapter/deepseek-model-adapter.ts
@@ -0,0 +1,49 @@
+import OpenAI from "openai";
+import type {
+  Message,
+  ModelEvent,
+  ModelPort,
+  ModelRequest,
+} from "@great-agent/agent-core";
+
+export type DeepSeekModelOptions = Readonly<{
+  apiKey: string;
+  baseURL: string;
+  model: string;
+}>;
+
+export class DeepSeekModelAdapter implements ModelPort {
+  private readonly client: OpenAI;
+
+  constructor(private readonly options: DeepSeekModelOptions) {
+    this.client = new OpenAI({
+      apiKey: options.apiKey,
+      baseURL: options.baseURL,
+    });
+  }
+
+  async *stream(
+    request: ModelRequest,
+    signal: AbortSignal,
+  ): AsyncIterable<ModelEvent> {
+    const response = await this.client.chat.completions.create(
+      {
+        model: request.model === "default" ? this.options.model : request.model,
+        messages: request.messages.map(toModelMessage),
+        stream: true,
+      },
+      { signal },
+    );
+    for await (const chunk of response) {
+      const delta = chunk.choices[0]?.delta.content;
+      if (delta) yield { type: "text.delta", delta };
+    }
+    yield { type: "response.completed" };
+  }
+}
+
+function toModelMessage(
+  message: Message,
+): OpenAI.Chat.Completions.ChatCompletionMessageParam {
+  return { role: message.role, content: message.content };
+}
diff --git a/packages/model-deepseek/src/index.ts b/packages/model-deepseek/src/index.ts
index 8d61db6..7acc507 100644
--- a/packages/model-deepseek/src/index.ts
+++ b/packages/model-deepseek/src/index.ts
@@ -1 +1,4 @@
-export const deepSeekAdapterPackage = "@great-agent/model-deepseek";
+export {
+  DeepSeekModelAdapter,
+  type DeepSeekModelOptions,
+} from "./adapter/deepseek-model-adapter";
diff --git a/packages/web-contracts/src/events/run-event.ts b/packages/web-contracts/src/events/run-event.ts
new file mode 100644
index 0000000..af5f06d
--- /dev/null
+++ b/packages/web-contracts/src/events/run-event.ts
@@ -0,0 +1,18 @@
+import { z } from "zod";
+
+export const runEventSchema = z.object({
+  runId: z.string(),
+  sequence: z.number().int().positive(),
+  timestamp: z.string(),
+  type: z.enum([
+    "run.started",
+    "message.started",
+    "message.delta",
+    "message.completed",
+    "run.completed",
+    "run.failed",
+  ]),
+  payload: z.record(z.string(), z.unknown()),
+});
+
+export type RunEventResponse = z.infer<typeof runEventSchema>;
diff --git a/packages/web-contracts/src/index.ts b/packages/web-contracts/src/index.ts
index 97ae02e..8c43541 100644
--- a/packages/web-contracts/src/index.ts
+++ b/packages/web-contracts/src/index.ts
@@ -1,5 +1,8 @@
 export { healthResponseSchema, type HealthResponse } from "./responses/health";
 export { messageInputSchema, type MessageInput } from "./requests/message";
+export { startRunRequestSchema, type StartRunRequest } from "./requests/run";
+export { runEventSchema, type RunEventResponse } from "./events/run-event";
+export { startedRunSchema, type StartedRunResponse } from "./responses/run";
 export {
   conversationSchema,
   conversationSummarySchema,
diff --git a/packages/web-contracts/src/requests/run.ts b/packages/web-contracts/src/requests/run.ts
new file mode 100644
index 0000000..3eda103
--- /dev/null
+++ b/packages/web-contracts/src/requests/run.ts
@@ -0,0 +1,15 @@
+import { z } from "zod";
+
+export const startRunRequestSchema = z.discriminatedUnion("kind", [
+  z.object({
+    kind: z.literal("ordinary"),
+    message: z.string().trim().min(1).max(32_000),
+  }),
+  z.object({
+    kind: z.literal("existing"),
+    conversationId: z.string().min(1),
+    message: z.string().trim().min(1).max(32_000),
+  }),
+]);
+
+export type StartRunRequest = z.infer<typeof startRunRequestSchema>;
diff --git a/packages/web-contracts/src/responses/conversation.ts b/packages/web-contracts/src/responses/conversation.ts
index 7367aac..8ad7d92 100644
--- a/packages/web-contracts/src/responses/conversation.ts
+++ b/packages/web-contracts/src/responses/conversation.ts
@@ -5,6 +5,7 @@ export const messageSchema = z.object({
   role: z.enum(["user", "assistant"]),
   content: z.string(),
   createdAt: z.string(),
+  runId: z.string(),
 });
 
 export const conversationSummarySchema = z.object({
diff --git a/packages/web-contracts/src/responses/run.ts b/packages/web-contracts/src/responses/run.ts
new file mode 100644
index 0000000..2c9176e
--- /dev/null
+++ b/packages/web-contracts/src/responses/run.ts
@@ -0,0 +1,9 @@
+import { z } from "zod";
+
+export const startedRunSchema = z.object({
+  conversationId: z.string(),
+  runId: z.string(),
+  status: z.literal("running"),
+});
+
+export type StartedRunResponse = z.infer<typeof startedRunSchema>;