diff --git a/README.md b/README.md
index a116730..c206947 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ Notes:
 - Redis service: host `redis`, port `6379`, default no password, client `phpredis`.
 - API 默认使用 JWT：`AUTH_GUARD=api`，会话驱动为 `array`（无状态）。首次运行如需重置密钥：`docker compose run --rm --entrypoint=php app artisan jwt:secret --force`。
 - API 说明文档：`docs/user/user-api.md`（中文）；OpenAPI/Swagger 规范：`docs/user/user-openapi.yaml`（可导入 Swagger UI / Postman）。
+- ChatSession 接口文档：`docs/ChatSession/chat-session-api.md`；OpenAPI：`docs/ChatSession/chat-session-openapi.yaml`。
 - CORS：通过全局中间件开启，允许域名由环境变量 `CORS_ALLOWED_ORIGINS` 配置（默认 `http://localhost:5173`，多域名用逗号分隔）。
 - 项目沟通与自然语言默认使用中文。
 
diff --git a/app/Http/Controllers/ChatSessionController.php b/app/Http/Controllers/ChatSessionController.php
index 21f429e..2f6dff5 100644
--- a/app/Http/Controllers/ChatSessionController.php
+++ b/app/Http/Controllers/ChatSessionController.php
@@ -5,8 +5,9 @@ namespace App\Http\Controllers;
 use App\Exceptions\ChatSessionStatusException;
 use App\Http\Requests\AppendMessageRequest;
 use App\Http\Requests\CreateSessionRequest;
+use App\Http\Requests\UpdateSessionRequest;
+use App\Http\Resources\ChatSessionResource;
 use App\Http\Resources\MessageResource;
-use App\Models\Message;
 use App\Services\ChatService;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
@@ -17,13 +18,26 @@ class ChatSessionController extends Controller
     {
     }
 
+    /**
+     * 存储新的会话。
+     *
+     * @param CreateSessionRequest $request 包含会话信息的请求实例。
+     * @return JsonResponse 返回包含新创建会话信息的 JSON 响应，状态码为 201。
+     */
     public function store(CreateSessionRequest $request): JsonResponse
     {
         $session = $this->service->createSession($request->input('session_name'));
 
-        return response()->json($session, 201);
+        return (new ChatSessionResource($session))->response()->setStatusCode(201);
     }
 
+    /**
+     * 追加一条消息。
+     *
+     * @param string $sessionId 会话 ID。
+     * @param AppendMessageRequest $request 追加消息的请求实例。
+     * @return JsonResponse 添加消息的响应，包含添加的消息信息。
+     */
     public function append(string $sessionId, AppendMessageRequest $request): JsonResponse
     {
         try {
@@ -38,6 +52,13 @@ class ChatSessionController extends Controller
         return (new MessageResource($message))->response()->setStatusCode(201);
     }
 
+    /**
+     * 获取指定会话的消息列表。
+     *
+     * @param Request $request 包含查询参数的请求实例，其中包括 after_seq 和 limit。
+     * @param string $sessionId 会话的唯一标识符。
+     * @return JsonResponse 返回包含消息列表的 JSON 响应。
+     */
     public function listMessages(Request $request, string $sessionId): JsonResponse
     {
         $afterSeq = (int) $request->query('after_seq', 0);
@@ -48,4 +69,44 @@ class ChatSessionController extends Controller
 
         return MessageResource::collection($messages)->response();
     }
+
+    /**
+     * 获取会话列表。
+     *
+     * @param Request $request 获取会话列表的请求实例。
+     * @return JsonResponse 获取的会话列表的 JSON 响应。
+     */
+    public function index(Request $request): JsonResponse
+    {
+        $page = (int) $request->query('page', 1);
+        $perPage = (int) $request->query('per_page', 15);
+        $perPage = $perPage > 0 && $perPage <= 100 ? $perPage : 15;
+
+        $filter = [
+            'status' => $request->query('status'),
+            'q' => $request->query('q'),
+        ];
+
+        $paginator = $this->service->listSessions($filter, $page, $perPage);
+
+        return ChatSessionResource::collection($paginator)->response();
+    }
+
+    /**
+     * 更新会话。
+     *
+     * @param string $sessionId 会话的唯一标识符。
+     * @param UpdateSessionRequest $request 更新会话的请求实例。
+     * @return JsonResponse 更新后的会话的 JSON 响应。
+     */
+    public function update(string $sessionId, UpdateSessionRequest $request): JsonResponse
+    {
+        try {
+            $session = $this->service->updateSession($sessionId, $request->validated());
+        } catch (ChatSessionStatusException $e) {
+            return response()->json(['message' => $e->getMessage()], 403);
+        }
+
+        return (new ChatSessionResource($session))->response();
+    }
 }
diff --git a/app/Http/Requests/UpdateSessionRequest.php b/app/Http/Requests/UpdateSessionRequest.php
new file mode 100644
index 0000000..0f70c26
--- /dev/null
+++ b/app/Http/Requests/UpdateSessionRequest.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Enums\ChatSessionStatus;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UpdateSessionRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function rules(): array
+    {
+        return [
+            'session_name' => ['sometimes', 'string', 'min:1', 'max:255'],
+            'status' => ['sometimes', 'string', Rule::in(ChatSessionStatus::all())],
+        ];
+    }
+
+    protected function prepareForValidation(): void
+    {
+        if ($this->has('session_name') && is_string($this->input('session_name'))) {
+            $this->merge(['session_name' => trim($this->input('session_name'))]);
+        }
+    }
+
+    public function withValidator($validator)
+    {
+        $validator->after(function ($v) {
+            if (! $this->has('session_name') && ! $this->has('status')) {
+                $v->errors()->add('payload', '至少提供一个可更新字段');
+            }
+        });
+    }
+}
diff --git a/app/Http/Resources/ChatSessionResource.php b/app/Http/Resources/ChatSessionResource.php
new file mode 100644
index 0000000..06c43a2
--- /dev/null
+++ b/app/Http/Resources/ChatSessionResource.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+use Illuminate\Support\Str;
+
+/** @mixin \App\Models\ChatSession */
+class ChatSessionResource extends JsonResource
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        $preview = $this->last_message_content ?? '';
+
+        return [
+            'session_id' => $this->session_id,
+            'session_name' => $this->session_name,
+            'status' => $this->status,
+            'last_seq' => $this->last_seq,
+            'created_at' => $this->created_at,
+            'updated_at' => $this->updated_at,
+            'last_message_at' => $this->last_message_at,
+            'last_message_preview' => $preview ? Str::limit($preview, 120) : '',
+            'last_message_role' => $this->last_message_role,
+            'last_message_type' => $this->last_message_type,
+        ];
+    }
+}
diff --git a/app/Models/ChatSession.php b/app/Models/ChatSession.php
index 7d9cae5..5665de6 100644
--- a/app/Models/ChatSession.php
+++ b/app/Models/ChatSession.php
@@ -22,6 +22,7 @@ class ChatSession extends Model
         'session_name',
         'status',
         'last_seq',
+        'last_message_id',
     ];
 
     protected function casts(): array
diff --git a/app/Services/ChatService.php b/app/Services/ChatService.php
index f0dbf7d..1148e9c 100644
--- a/app/Services/ChatService.php
+++ b/app/Services/ChatService.php
@@ -6,6 +6,8 @@ use App\Enums\ChatSessionStatus;
 use App\Exceptions\ChatSessionStatusException;
 use App\Models\ChatSession;
 use App\Models\Message;
+use Illuminate\Contracts\Pagination\LengthAwarePaginator;
+use Illuminate\Database\Eloquent\ModelNotFoundException;
 use Illuminate\Database\QueryException;
 use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\DB;
@@ -13,6 +15,12 @@ use Illuminate\Support\Str;
 
 class ChatService
 {
+
+    /**
+     * 创建一个新聊天会话。
+     * @param string|null $name
+     * @return ChatSession
+     */
     public function createSession(string $name = null): ChatSession
     {
         return ChatSession::create([
@@ -23,13 +31,31 @@ class ChatService
         ]);
     }
 
+   /**
+     * 根据会话ID获取聊天会话对象
+     *
+     * @param string $sessionId 会话唯一标识符
+     * @return ChatSession 返回对应的聊天会话对象
+     * @throws ModelNotFoundException 当找不到指定会话时抛出异常
+     */
     public function getSession(string $sessionId): ChatSession
     {
         return ChatSession::query()->whereKey($sessionId)->firstOrFail();
     }
 
+
     /**
-     * @param array<string, mixed> $dto
+     * 将消息追加到指定的聊天会话中。
+     *
+     * @param array<string, mixed> $dto 包含消息详细信息的数据传输对象，包括以下键：
+     *                                  - session_id: 聊天会话的唯一标识符
+     *                                  - role: 消息角色（如发件人或收件人）
+     *                                  - type: 消息类型
+     *                                  - content: 消息内容（可选）
+     *                                  - payload: 附加信息（可选）
+     *                                  - reply_to: 被回复的消息 ID（可选）
+     *                                  - dedupe_key: 消息去重键（可选）
+     * @return Message 返回成功追加的消息实例。如果存在去重键并已存在重复消息，则返回现有的消息。
      */
     public function appendMessage(array $dto): Message
     {
@@ -88,6 +114,7 @@ class ChatService
 
             $session->update([
                 'last_seq' => $newSeq,
+                'last_message_id' => $message->message_id,
                 'updated_at' => now(),
             ]);
 
@@ -95,6 +122,14 @@ class ChatService
         });
     }
 
+    /**
+     * 列出指定会话中指定序号之后的消息。
+     *
+     * @param string $sessionId 会话唯一标识符
+     * @param int $afterSeq 指定序号之后的消息将被列出
+     * @param int $limit 最多返回的消息数量，默认为 50
+     * @return Collection 返回指定序号之后的消息列表
+     */
     public function listMessagesBySeq(string $sessionId, int $afterSeq, int $limit = 50): Collection
     {
         $this->getSession($sessionId); // ensure exists
@@ -107,6 +142,89 @@ class ChatService
             ->get();
     }
 
+    /**
+     * 获取会话列表
+     *
+     * @param array $filter 过滤条件数组，支持status状态过滤和q关键字搜索
+     * @param int $page 页码
+     * @param int $perPage 每页数量
+     * @return LengthAwarePaginator 分页结果
+     */
+    public function listSessions(array $filter, int $page, int $perPage): LengthAwarePaginator
+    {
+        // 构建基础查询
+        $query = $this->baseSessionQuery();
+
+        // 根据状态过滤会话
+        if (! empty($filter['status'])) {
+            $query->where('chat_sessions.status', $filter['status']);
+        }
+
+        // 根据会话名称进行模糊搜索
+        if (! empty($filter['q'])) {
+            $q = $filter['q'];
+            $query->where('chat_sessions.session_name', 'ilike', '%'.$q.'%');
+        }
+
+        // 按更新时间倒序排列
+        $query->orderByDesc('chat_sessions.updated_at');
+
+        // 执行分页查询
+        return $query->paginate($perPage, ['*'], 'page', $page);
+    }
+
+
+    /**
+     * 更新聊天会话信息
+     *
+     * @param string $sessionId 会话ID
+     * @param array $patch 需要更新的字段数据
+     * @return ChatSession 更新后的聊天会话对象
+     * @throws ChatSessionStatusException 当尝试重新打开已关闭的会话时抛出异常
+     */
+    public function updateSession(string $sessionId, array $patch): ChatSession
+    {
+        // 查找包含最后一条消息的会话
+        $session = $this->findSessionWithLastMessage($sessionId);
+
+        // 检查会话状态变更合法性：已关闭的会话不能重新打开
+        if (isset($patch['status']) && $session->status === ChatSessionStatus::CLOSED && $patch['status'] !== ChatSessionStatus::CLOSED) {
+            throw new ChatSessionStatusException('Closed session cannot be reopened');
+        }
+
+        // 填充更新数据并保存
+        $session->fill($patch);
+        $session->updated_at = now();
+        $session->save();
+
+        // 返回更新后的会话信息
+        return $this->findSessionWithLastMessage($sessionId);
+    }
+
+
+    private function baseSessionQuery()
+    {
+        return ChatSession::query()
+            ->leftJoin('messages as lm', 'lm.message_id', '=', 'chat_sessions.last_message_id')
+            ->select('chat_sessions.*')
+            ->addSelect([
+                'lm.created_at as last_message_at',
+                'lm.content as last_message_content',
+                'lm.role as last_message_role',
+                'lm.type as last_message_type',
+            ]);
+    }
+
+    private function findSessionWithLastMessage(string $sessionId): ChatSession
+    {
+        /** @var ChatSession $session */
+        $session = $this->baseSessionQuery()
+            ->where('chat_sessions.session_id', $sessionId)
+            ->firstOrFail();
+
+        return $session;
+    }
+
     private function ensureCanAppend(ChatSession $session, string $role, string $type): void
     {
         if ($session->status === ChatSessionStatus::CLOSED) {
diff --git a/database/migrations/2025_02_14_000004_add_last_message_to_chat_sessions.php b/database/migrations/2025_02_14_000004_add_last_message_to_chat_sessions.php
new file mode 100644
index 0000000..dd46d97
--- /dev/null
+++ b/database/migrations/2025_02_14_000004_add_last_message_to_chat_sessions.php
@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('chat_sessions', function (Blueprint $table) {
+            $table->uuid('last_message_id')->nullable()->after('last_seq');
+            $table->index('updated_at');
+            $table->index('status');
+            $table->index('last_message_id');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('chat_sessions', function (Blueprint $table) {
+            $table->dropIndex(['updated_at']);
+            $table->dropIndex(['status']);
+            $table->dropIndex(['last_message_id']);
+            $table->dropColumn('last_message_id');
+        });
+    }
+};
diff --git a/database/seeders/DatabaseSeeder.php b/database/seeders/DatabaseSeeder.php
index c04e78c..0a562e9 100644
--- a/database/seeders/DatabaseSeeder.php
+++ b/database/seeders/DatabaseSeeder.php
@@ -25,5 +25,15 @@ class DatabaseSeeder extends Seeder
                 'email_verified_at' => now(),
             ],
         );
+
+        User::updateOrCreate(
+            ['email' => 'guxinpei@qq.com'],
+            [
+                'name' => 'roog',
+                'password' => Hash::make('w2021976'),
+                'is_active' => true,
+                'email_verified_at' => now(),
+            ],
+        );
     }
 }
diff --git a/docs/ChatSession/chat-session-api.md b/docs/ChatSession/chat-session-api.md
new file mode 100644
index 0000000..08b1866
--- /dev/null
+++ b/docs/ChatSession/chat-session-api.md
@@ -0,0 +1,96 @@
+# ChatSession & Message API（MVP-1）
+
+基地址：`http://localhost:8000/api`（FrankenPHP 容器 8000 端口）  
+认证方式：JWT，`Authorization: Bearer {token}`  
+自然语言：中文
+
+## 变更记录
+- 2025-02-14：新增 ChatSession 创建、消息追加、增量查询接口；支持状态门禁与 dedupe 幂等。
+- 2025-02-14：MVP-1.1 增加会话列表、会话更新（重命名/状态变更），列表附带最后一条消息摘要。
+
+## 领域模型
+- `ChatSession`：`session_id`(UUID)、`session_name`、`status`(`OPEN`/`LOCKED`/`CLOSED`)、`last_seq`
+- `Message`：`message_id`(UUID)、`session_id`、`role`(`USER`/`AGENT`/`TOOL`/`SYSTEM`)、`type`(字符串)、`content`、`payload`(json)、`seq`(会话内递增)、`reply_to`(UUID)、`dedupe_key`
+- 幂等：`UNIQUE (session_id, dedupe_key)`；同一 dedupe_key 返回已有消息。
+- 状态门禁：`CLOSED` 禁止追加，例外 `role=SYSTEM && type in [run.status, error]`；`LOCKED` 禁止 `role=USER && type=user.prompt`。
+- 会话缓存：`chat_sessions.last_message_id` 记录最后一条消息；`appendMessage` 事务内同步更新 `last_seq`、`last_message_id`、`updated_at`。
+
+## 接口
+### 创建会话
+- `POST /sessions`
+- 请求体字段：
+  - `session_name` (string, 可选，<=255)：会话名称。
+- 响应 201 字段：
+  - `session_id` (uuid)
+  - `session_name` (string|null)
+  - `status` (`OPEN|LOCKED|CLOSED`)
+  - `last_seq` (int)
+  - `last_message_id` (uuid|null)
+  - `created_at` / `updated_at`
+
+### 追加消息
+- `POST /sessions/{session_id}/messages`
+- 请求体字段：
+  - `role` (required, `USER|AGENT|TOOL|SYSTEM`)
+  - `type` (required, string, <=64)，如 `user.prompt`/`agent.message` 等。
+  - `content` (string|null)
+  - `payload` (object|null) 作为 jsonb 存储。
+  - `reply_to` (uuid|null)
+  - `dedupe_key` (string|null, <=128) 幂等键。
+- 响应 201 字段：
+  - `message_id` (uuid)
+  - `session_id` (uuid)
+  - `seq` (int，会话内递增)
+  - `role` / `type` / `content` / `payload` / `reply_to` / `dedupe_key`
+  - `created_at`
+- 403：违反状态门禁（CLOSED 禁止，LOCKED 禁止 user.prompt）。
+- 幂等：同 session + dedupe_key 返回已有消息（同 `message_id/seq`）。
+
+### 按序增量查询
+- `GET /sessions/{session_id}/messages?after_seq=0&limit=50`
+- 查询参数：
+  - `after_seq` (int, 默认 0)：仅返回大于该 seq 的消息。
+  - `limit` (int, 默认 50，<=200)。
+- 响应 200：`data` 数组，元素字段同“追加消息”响应。
+
+### 会话列表
+- `GET /sessions?page=1&per_page=15&status=OPEN&q=keyword`
+- 查询参数：
+  - `page` (int, 默认 1)
+  - `per_page` (int, 默认 15，<=100)
+  - `status` (`OPEN|LOCKED|CLOSED`，可选)
+  - `q` (string，可选，对 `session_name` ILIKE 模糊匹配)
+- 响应 200：分页结构（`data/links/meta`），`data` 每项字段：
+  - `session_id, session_name, status, last_seq, created_at, updated_at`
+  - `last_message_id`
+  - `last_message_at`
+  - `last_message_preview`（content 截断 120，content 为空则空字符串）
+  - `last_message_role, last_message_type`
+  - 排序：`updated_at` DESC
+
+### 会话更新
+- `PATCH /sessions/{session_id}`
+- 请求体（至少提供一项，否则 422）：
+  - `session_name` (string, 1..255，可选，自动 trim)
+  - `status` (`OPEN|LOCKED|CLOSED`，可选)
+- 规则：
+  - `CLOSED` 不可改回 `OPEN`（返回 403）。
+  - 任意更新都会刷新 `updated_at`。
+- 响应 200 字段：同会话列表项字段。
+
+## cURL 示例
+```bash
+# 创建会话
+SESSION_ID=$(curl -s -X POST http://localhost:8000/api/sessions \
+  -H "Authorization: Bearer $TOKEN" -H "Content-Type: application/json" \
+  -d '{"session_name":"Demo"}' | jq -r '.data.session_id')
+
+# 追加消息（支持 dedupe_key 幂等）
+curl -s -X POST http://localhost:8000/api/sessions/$SESSION_ID/messages \
+  -H "Authorization: Bearer $TOKEN" -H "Content-Type: application/json" \
+  -d '{"role":"USER","type":"user.prompt","content":"hello","dedupe_key":"k1"}'
+
+# 增量查询
+curl -s "http://localhost:8000/api/sessions/$SESSION_ID/messages?after_seq=0&limit=50" \
+  -H "Authorization: Bearer $TOKEN"
+```
diff --git a/docs/ChatSession/chat-session-openapi.yaml b/docs/ChatSession/chat-session-openapi.yaml
new file mode 100644
index 0000000..a7afe13
--- /dev/null
+++ b/docs/ChatSession/chat-session-openapi.yaml
@@ -0,0 +1,344 @@
+openapi: 3.0.3
+info:
+  title: ChatSession & Message API
+  version: 1.0.0
+  description: |
+    ChatSession & Message MVP-1，支持会话创建、消息追加、增量查询。自然语言：中文。
+servers:
+  - url: http://localhost:8000/api
+    description: 本地开发（FrankenPHP / Docker）
+tags:
+  - name: ChatSession
+    description: 会话管理与消息
+paths:
+  /sessions:
+    post:
+      tags: [ChatSession]
+      summary: 创建会话
+      security:
+        - bearerAuth: []
+      requestBody:
+        required: false
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/CreateSessionRequest'
+      responses:
+        "201":
+          description: 创建成功
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ChatSession'
+        "401":
+          description: 未授权
+    get:
+      tags: [ChatSession]
+      summary: 会话列表
+      security:
+        - bearerAuth: []
+      parameters:
+        - in: query
+          name: page
+          schema:
+            type: integer
+            default: 1
+        - in: query
+          name: per_page
+          schema:
+            type: integer
+            default: 15
+            maximum: 100
+        - in: query
+          name: status
+          schema:
+            type: string
+            enum: [OPEN, LOCKED, CLOSED]
+        - in: query
+          name: q
+          schema:
+            type: string
+          description: 模糊匹配 session_name
+      responses:
+        "200":
+          description: 分页会话列表
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  data:
+                    type: array
+                    items:
+                      $ref: '#/components/schemas/ChatSession'
+                  links:
+                    $ref: '#/components/schemas/PaginationLinks'
+                  meta:
+                    $ref: '#/components/schemas/PaginationMeta'
+        "401":
+          description: 未授权
+  /sessions/{session_id}/messages:
+    post:
+      tags: [ChatSession]
+      summary: 追加消息（含幂等与状态门禁）
+      security:
+        - bearerAuth: []
+      parameters:
+        - in: path
+          name: session_id
+          required: true
+          schema:
+            type: string
+            format: uuid
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/AppendMessageRequest'
+      responses:
+        "201":
+          description: 追加成功
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/MessageResource'
+        "403":
+          description: 状态门禁禁止
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        "401":
+          description: 未授权
+    get:
+      tags: [ChatSession]
+      summary: 按 seq 增量查询消息
+      security:
+        - bearerAuth: []
+      parameters:
+        - in: path
+          name: session_id
+          required: true
+          schema:
+            type: string
+            format: uuid
+        - in: query
+          name: after_seq
+          schema:
+            type: integer
+            default: 0
+          description: 仅返回 seq 大于该值的消息
+        - in: query
+          name: limit
+          schema:
+            type: integer
+            default: 50
+            maximum: 200
+          description: 返回数量上限
+      responses:
+        "200":
+          description: 按 seq 升序的消息列表
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  data:
+                    type: array
+                    items:
+                      $ref: '#/components/schemas/MessageResource'
+        "401":
+          description: 未授权
+  /sessions/{session_id}:
+    patch:
+      tags: [ChatSession]
+      summary: 更新会话（重命名/状态）
+      security:
+        - bearerAuth: []
+      parameters:
+        - in: path
+          name: session_id
+          required: true
+          schema:
+            type: string
+            format: uuid
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/UpdateSessionRequest'
+      responses:
+        "200":
+          description: 更新成功
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ChatSession'
+        "403":
+          description: 状态门禁禁止
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        "422":
+          description: 校验失败
+        "401":
+          description: 未授权
+components:
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+  schemas:
+    ChatSession:
+      type: object
+      properties:
+        session_id:
+          type: string
+          format: uuid
+        session_name:
+          type: string
+          nullable: true
+        status:
+          type: string
+          enum: [OPEN, LOCKED, CLOSED]
+        last_seq:
+          type: integer
+        last_message_id:
+          type: string
+          format: uuid
+          nullable: true
+        last_message_at:
+          type: string
+          format: date-time
+          nullable: true
+        last_message_preview:
+          type: string
+        last_message_role:
+          type: string
+          nullable: true
+        last_message_type:
+          type: string
+          nullable: true
+        created_at:
+          type: string
+          format: date-time
+        updated_at:
+          type: string
+          format: date-time
+    CreateSessionRequest:
+      type: object
+      properties:
+        session_name:
+          type: string
+          maxLength: 255
+    UpdateSessionRequest:
+      type: object
+      properties:
+        session_name:
+          type: string
+          minLength: 1
+          maxLength: 255
+        status:
+          type: string
+          enum: [OPEN, LOCKED, CLOSED]
+    AppendMessageRequest:
+      type: object
+      required: [role, type]
+      properties:
+        role:
+          type: string
+          enum: [USER, AGENT, TOOL, SYSTEM]
+        type:
+          type: string
+          maxLength: 64
+          example: user.prompt
+        content:
+          type: string
+          nullable: true
+        payload:
+          type: object
+          nullable: true
+        reply_to:
+          type: string
+          format: uuid
+          nullable: true
+        dedupe_key:
+          type: string
+          maxLength: 128
+          nullable: true
+    MessageResource:
+      type: object
+      properties:
+        message_id:
+          type: string
+          format: uuid
+        session_id:
+          type: string
+          format: uuid
+        seq:
+          type: integer
+        role:
+          type: string
+          enum: [USER, AGENT, TOOL, SYSTEM]
+        type:
+          type: string
+        content:
+          type: string
+          nullable: true
+        payload:
+          type: object
+          nullable: true
+        reply_to:
+          type: string
+          format: uuid
+          nullable: true
+        dedupe_key:
+          type: string
+          nullable: true
+        created_at:
+          type: string
+          format: date-time
+    Error:
+      type: object
+      properties:
+        message:
+          type: string
+          example: Session is closed
+    PaginationLinks:
+      type: object
+      properties:
+        first:
+          type: string
+          example: http://localhost:8000/api/sessions?page=1
+        last:
+          type: string
+          example: http://localhost:8000/api/sessions?page=1
+        prev:
+          type: string
+          nullable: true
+        next:
+          type: string
+          nullable: true
+    PaginationMeta:
+      type: object
+      properties:
+        current_page:
+          type: integer
+        from:
+          type: integer
+          nullable: true
+        last_page:
+          type: integer
+        path:
+          type: string
+        per_page:
+          type: integer
+        to:
+          type: integer
+          nullable: true
+        total:
+          type: integer
diff --git a/docs/user/user-api.md b/docs/User/user-api.md
similarity index 100%
rename from docs/user/user-api.md
rename to docs/User/user-api.md
diff --git a/docs/user/user-openapi.yaml b/docs/User/user-openapi.yaml
similarity index 100%
rename from docs/user/user-openapi.yaml
rename to docs/User/user-openapi.yaml
diff --git a/routes/api.php b/routes/api.php
index 684c8ac..c5e0075 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -21,7 +21,9 @@ Route::middleware('auth.jwt')->group(function () {
     Route::post('/users/{user}/deactivate', [UserController::class, 'deactivate']);
     Route::post('/users/{user}/activate', [UserController::class, 'activate']);
 
+    Route::get('/sessions', [ChatSessionController::class, 'index']);
     Route::post('/sessions', [ChatSessionController::class, 'store']);
     Route::post('/sessions/{session_id}/messages', [ChatSessionController::class, 'append']);
     Route::get('/sessions/{session_id}/messages', [ChatSessionController::class, 'listMessages']);
+    Route::patch('/sessions/{session_id}', [ChatSessionController::class, 'update']);
 });
diff --git a/tests/Feature/ChatSessionTest.php b/tests/Feature/ChatSessionTest.php
index 967da85..43d055e 100644
--- a/tests/Feature/ChatSessionTest.php
+++ b/tests/Feature/ChatSessionTest.php
@@ -5,6 +5,7 @@ namespace Tests\Feature;
 use App\Enums\ChatSessionStatus;
 use App\Models\User;
 use App\Services\ChatService;
+use Illuminate\Support\Carbon;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use PHPOpenSourceSaver\JWTAuth\Facades\JWTAuth;
 use Tests\TestCase;
@@ -89,7 +90,7 @@ class ChatSessionTest extends TestCase
             'session_name' => 'API Session',
         ])->assertCreated();
 
-        $sessionId = $createSession->json('session_id');
+        $sessionId = $createSession->json('data.session_id');
 
         $append = $this->withHeaders($headers)->postJson("/api/sessions/{$sessionId}/messages", [
             'role' => 'USER',
@@ -105,4 +106,116 @@ class ChatSessionTest extends TestCase
         $this->assertEquals(1, $list->json('data.0.seq'));
         $this->assertEquals('hello api', $list->json('data.0.content'));
     }
+
+    public function test_session_list_sorted_and_last_message_preview(): void
+    {
+        $user = User::factory()->create();
+        $headers = $this->authHeader($user);
+        $service = app(ChatService::class);
+
+        Carbon::setTestNow('2025-01-01 00:00:00');
+        $s1 = $service->createSession('First');
+        $service->appendMessage([
+            'session_id' => $s1->session_id,
+            'role' => 'USER',
+            'type' => 'user.prompt',
+            'content' => 'hello first',
+        ]);
+
+        Carbon::setTestNow('2025-01-01 00:00:10');
+        $s2 = $service->createSession('Second');
+        $service->appendMessage([
+            'session_id' => $s2->session_id,
+            'role' => 'USER',
+            'type' => 'user.prompt',
+            'content' => 'hello second',
+        ]);
+
+        Carbon::setTestNow();
+
+        $resp = $this->withHeaders($headers)->getJson('/api/sessions?per_page=10')
+            ->assertOk();
+
+        $this->assertEquals($s2->session_id, $resp->json('data.0.session_id'));
+        $this->assertEquals('hello second', $resp->json('data.0.last_message_preview'));
+        $this->assertEquals('hello first', $resp->json('data.1.last_message_preview'));
+        $this->assertNotNull($resp->json('data.0.last_message_at'));
+    }
+
+    public function test_session_list_filters_status_and_query(): void
+    {
+        $user = User::factory()->create();
+        $headers = $this->authHeader($user);
+        $service = app(ChatService::class);
+
+        $open = $service->createSession('Alpha');
+        $locked = $service->createSession('Beta');
+        $locked->update(['status' => ChatSessionStatus::LOCKED]);
+        $closed = $service->createSession('Gamma');
+        $closed->update(['status' => ChatSessionStatus::CLOSED]);
+
+        $respStatus = $this->withHeaders($headers)->getJson('/api/sessions?status=LOCKED')
+            ->assertOk();
+        $this->assertCount(1, $respStatus->json('data'));
+        $this->assertEquals($locked->session_id, $respStatus->json('data.0.session_id'));
+
+        $respQuery = $this->withHeaders($headers)->getJson('/api/sessions?q=Alpha')
+            ->assertOk();
+        $this->assertCount(1, $respQuery->json('data'));
+        $this->assertEquals($open->session_id, $respQuery->json('data.0.session_id'));
+    }
+
+    public function test_patch_updates_session_name(): void
+    {
+        $user = User::factory()->create();
+        $headers = $this->authHeader($user);
+        $service = app(ChatService::class);
+        $session = $service->createSession('Old Name');
+
+        $resp = $this->withHeaders($headers)->patchJson("/api/sessions/{$session->session_id}", [
+            'session_name' => 'New Name',
+        ])->assertOk();
+
+        $this->assertEquals('New Name', $resp->json('data.session_name'));
+    }
+
+    public function test_patch_updates_status_transitions(): void
+    {
+        $user = User::factory()->create();
+        $headers = $this->authHeader($user);
+        $service = app(ChatService::class);
+        $session = $service->createSession('Status Session');
+
+        $this->withHeaders($headers)->patchJson("/api/sessions/{$session->session_id}", [
+            'status' => ChatSessionStatus::LOCKED,
+        ])->assertOk()->assertJsonFragment(['status' => ChatSessionStatus::LOCKED]);
+
+        $this->withHeaders($headers)->patchJson("/api/sessions/{$session->session_id}", [
+            'status' => ChatSessionStatus::OPEN,
+        ])->assertOk()->assertJsonFragment(['status' => ChatSessionStatus::OPEN]);
+    }
+
+    public function test_closed_session_cannot_reopen(): void
+    {
+        $user = User::factory()->create();
+        $headers = $this->authHeader($user);
+        $service = app(ChatService::class);
+        $session = $service->createSession('Closed Session');
+        $session->update(['status' => ChatSessionStatus::CLOSED]);
+
+        $this->withHeaders($headers)->patchJson("/api/sessions/{$session->session_id}", [
+            'status' => ChatSessionStatus::OPEN,
+        ])->assertStatus(403);
+    }
+
+    public function test_empty_patch_rejected(): void
+    {
+        $user = User::factory()->create();
+        $headers = $this->authHeader($user);
+        $service = app(ChatService::class);
+        $session = $service->createSession('Patch Empty');
+
+        $this->withHeaders($headers)->patchJson("/api/sessions/{$session->session_id}", [])
+            ->assertStatus(422);
+    }
 }