diff --git a/packages/cli/src/client/api.ts b/packages/cli/src/client/api.ts
index 4a616a5..e78fcc5 100644
--- a/packages/cli/src/client/api.ts
+++ b/packages/cli/src/client/api.ts
@@ -46,6 +46,37 @@ export interface HealthStatus {
   };
 }
 
+// ============ Command 相关 ============
+
+export interface CommandInfo {
+  name: string;
+  description?: string;
+  agent?: string;
+  model?: string;
+  subtask?: boolean;
+  source: string;
+  hasTemplate: boolean;
+}
+
+export interface CommandSearchResult {
+  name: string;
+  description?: string;
+  source: string;
+  score: number;
+}
+
+export interface CommandExecuteResult {
+  prompt: string;
+  agent?: string;
+  model?: string;
+  subtask?: boolean;
+}
+
+export interface CommandListResponse {
+  commands: Array<{ name: string; description?: string; source: string }>;
+  stats: { total: number; bySource: Record<string, number> };
+}
+
 /**
  * API Client 类
  */
@@ -180,6 +211,41 @@ export class APIClient {
       ? `${sseUrl}?token=${encodeURIComponent(this.token)}`
       : sseUrl;
   }
+
+  // ============================================================================
+  // Commands
+  // ============================================================================
+
+  async listCommands(): Promise<{ success: boolean; data: CommandListResponse }> {
+    return this.request('GET', '/api/commands');
+  }
+
+  async getCommand(name: string): Promise<{ success: boolean; data: CommandInfo }> {
+    return this.request('GET', `/api/commands/${encodeURIComponent(name)}`);
+  }
+
+  async executeCommand(
+    name: string,
+    args: string = ''
+  ): Promise<{ success: boolean; data?: CommandExecuteResult; error?: string }> {
+    return this.request('POST', `/api/commands/${encodeURIComponent(name)}/execute`, {
+      arguments: args,
+    });
+  }
+
+  async searchCommands(
+    query: string,
+    limit: number = 10
+  ): Promise<{ success: boolean; data: CommandSearchResult[] }> {
+    return this.request('POST', '/api/commands/search', { query, limit });
+  }
+
+  async reloadCommands(): Promise<{
+    success: boolean;
+    data: { message: string; stats: { total: number; bySource: Record<string, number> } };
+  }> {
+    return this.request('POST', '/api/commands/reload');
+  }
 }
 
 /**
diff --git a/packages/server/src/index.ts b/packages/server/src/index.ts
index 5e9cdaf..e0b385d 100644
--- a/packages/server/src/index.ts
+++ b/packages/server/src/index.ts
@@ -9,7 +9,7 @@ import { cors } from 'hono/cors';
 import { logger } from 'hono/logger';
 import { createBunWebSocket } from 'hono/bun';
 
-import { sessionsRouter, toolsRouter, configRouter, filesRouter } from './routes/index.js';
+import { sessionsRouter, toolsRouter, configRouter, filesRouter, commandsRouter } from './routes/index.js';
 import {
   handleWebSocket,
   handleWebSocketMessage,
@@ -82,6 +82,7 @@ api.route('/sessions', sessionsRouter);
 api.route('/tools', toolsRouter);
 api.route('/config', configRouter);
 api.route('/files', filesRouter);
+api.route('/commands', commandsRouter);
 
 // SSE 事件流
 api.get('/sessions/:id/events', handleSSE);
diff --git a/packages/server/src/routes/commands.ts b/packages/server/src/routes/commands.ts
new file mode 100644
index 0000000..762e280
--- /dev/null
+++ b/packages/server/src/routes/commands.ts
@@ -0,0 +1,323 @@
+/**
+ * Commands API Routes
+ *
+ * 提供斜杠命令的 REST API，支持列出、查询、执行和重载命令
+ */
+
+import { Hono } from 'hono';
+import { z } from 'zod';
+import { getConfig } from './config.js';
+
+// Zod schemas
+const ExecuteCommandInputSchema = z.object({
+  arguments: z.string().default(''),
+});
+
+const SearchCommandInputSchema = z.object({
+  query: z.string().min(1),
+  limit: z.number().int().min(1).max(50).default(10),
+});
+
+export const commandsRouter = new Hono();
+
+// Core 模块类型
+interface CommandModule {
+  getCommandRegistry: () => CommandRegistry;
+  createCommandExecutor: (workdir: string) => CommandExecutor;
+}
+
+interface CommandRegistry {
+  initialize(workdir: string): Promise<void>;
+  reload(workdir: string): Promise<void>;
+  get(name: string): Command | undefined;
+  getAll(): Command[];
+  list(): Array<{ name: string; description?: string; source: string }>;
+  search(query: string, limit?: number): Array<{ command: Command; score: number }>;
+  getStats(): { total: number; bySource: Record<string, number> };
+}
+
+interface CommandExecutor {
+  execute(input: CommandInput): Promise<CommandExecutionResult>;
+}
+
+interface Command {
+  name: string;
+  description?: string;
+  template: string;
+  agent?: string;
+  model?: string;
+  subtask?: boolean;
+  source: 'builtin' | 'user' | 'project';
+  sourcePath?: string;
+}
+
+interface CommandInput {
+  command: string;
+  arguments: string;
+  args: string[];
+  workdir: string;
+}
+
+interface CommandExecutionResult {
+  success: boolean;
+  prompt?: string;
+  agent?: string;
+  model?: string;
+  subtask?: boolean;
+  error?: string;
+}
+
+// Core 模块缓存
+let commandModule: CommandModule | null = null;
+
+/**
+ * 初始化 Command 模块
+ */
+async function initCommandModule(): Promise<CommandModule | null> {
+  if (commandModule) return commandModule;
+
+  try {
+    const corePath = '@ai-assistant/core';
+    const core = (await import(corePath)) as Record<string, unknown>;
+
+    if (
+      typeof core.getCommandRegistry !== 'function' ||
+      typeof core.createCommandExecutor !== 'function'
+    ) {
+      console.warn('[Commands] Core module missing command exports');
+      return null;
+    }
+
+    commandModule = {
+      getCommandRegistry: core.getCommandRegistry as () => CommandRegistry,
+      createCommandExecutor: core.createCommandExecutor as (workdir: string) => CommandExecutor,
+    };
+
+    // Initialize registry with server workdir
+    const config = getConfig();
+    const registry = commandModule.getCommandRegistry();
+    await registry.initialize(config.workdir);
+
+    console.log('[Commands] Command module initialized');
+    return commandModule;
+  } catch (error) {
+    console.warn('[Commands] Failed to load core module:', error);
+    return null;
+  }
+}
+
+/**
+ * GET /commands - 列出所有命令
+ */
+commandsRouter.get('/', async (c) => {
+  const module = await initCommandModule();
+
+  if (!module) {
+    return c.json(
+      {
+        success: false,
+        error: 'Command module not available',
+      },
+      503
+    );
+  }
+
+  const registry = module.getCommandRegistry();
+
+  return c.json({
+    success: true,
+    data: {
+      commands: registry.list(),
+      stats: registry.getStats(),
+    },
+  });
+});
+
+/**
+ * POST /commands/search - 搜索命令
+ * 注意：这个路由必须在 /:name 之前定义，否则会被匹配为命令名
+ */
+commandsRouter.post('/search', async (c) => {
+  const module = await initCommandModule();
+
+  if (!module) {
+    return c.json(
+      {
+        success: false,
+        error: 'Command module not available',
+      },
+      503
+    );
+  }
+
+  try {
+    const body = await c.req.json();
+    const input = SearchCommandInputSchema.parse(body);
+
+    const registry = module.getCommandRegistry();
+    const results = registry.search(input.query, input.limit);
+
+    return c.json({
+      success: true,
+      data: results.map(({ command, score }) => ({
+        name: command.name,
+        description: command.description,
+        source: command.source,
+        score,
+      })),
+    });
+  } catch (error) {
+    return c.json(
+      {
+        success: false,
+        error: error instanceof Error ? error.message : 'Invalid input',
+      },
+      400
+    );
+  }
+});
+
+/**
+ * POST /commands/reload - 重新加载命令
+ */
+commandsRouter.post('/reload', async (c) => {
+  const module = await initCommandModule();
+
+  if (!module) {
+    return c.json(
+      {
+        success: false,
+        error: 'Command module not available',
+      },
+      503
+    );
+  }
+
+  try {
+    const config = getConfig();
+    const registry = module.getCommandRegistry();
+    await registry.reload(config.workdir);
+
+    return c.json({
+      success: true,
+      data: {
+        message: 'Commands reloaded',
+        stats: registry.getStats(),
+      },
+    });
+  } catch (error) {
+    return c.json(
+      {
+        success: false,
+        error: error instanceof Error ? error.message : 'Reload failed',
+      },
+      500
+    );
+  }
+});
+
+/**
+ * GET /commands/:name - 获取命令详情
+ * 使用 {.+} 匹配包含 / 的命令名（如 deploy/staging）
+ */
+commandsRouter.get('/:name{.+}', async (c) => {
+  const name = c.req.param('name');
+  const module = await initCommandModule();
+
+  if (!module) {
+    return c.json(
+      {
+        success: false,
+        error: 'Command module not available',
+      },
+      503
+    );
+  }
+
+  const registry = module.getCommandRegistry();
+  const command = registry.get(name);
+
+  if (!command) {
+    return c.json(
+      {
+        success: false,
+        error: `Command not found: ${name}`,
+      },
+      404
+    );
+  }
+
+  // Return sanitized command info (exclude template for security)
+  return c.json({
+    success: true,
+    data: {
+      name: command.name,
+      description: command.description,
+      agent: command.agent,
+      model: command.model,
+      subtask: command.subtask,
+      source: command.source,
+      hasTemplate: !!command.template,
+    },
+  });
+});
+
+/**
+ * POST /commands/:name/execute - 执行命令（渲染模板）
+ */
+commandsRouter.post('/:name{.+}/execute', async (c) => {
+  const name = c.req.param('name');
+  const module = await initCommandModule();
+
+  if (!module) {
+    return c.json(
+      {
+        success: false,
+        error: 'Command module not available',
+      },
+      503
+    );
+  }
+
+  try {
+    const body = await c.req.json().catch(() => ({}));
+    const input = ExecuteCommandInputSchema.parse(body);
+
+    const config = getConfig();
+    const executor = module.createCommandExecutor(config.workdir);
+
+    // Parse arguments
+    const args = input.arguments ? input.arguments.split(/\s+/).filter(Boolean) : [];
+
+    const result = await executor.execute({
+      command: name,
+      arguments: input.arguments,
+      args,
+      workdir: config.workdir,
+    });
+
+    return c.json(
+      {
+        success: result.success,
+        data: result.success
+          ? {
+              prompt: result.prompt,
+              agent: result.agent,
+              model: result.model,
+              subtask: result.subtask,
+            }
+          : undefined,
+        error: result.error,
+      },
+      result.success ? 200 : 400
+    );
+  } catch (error) {
+    return c.json(
+      {
+        success: false,
+        error: error instanceof Error ? error.message : 'Invalid input',
+      },
+      400
+    );
+  }
+});
diff --git a/packages/server/src/routes/index.ts b/packages/server/src/routes/index.ts
index 3821201..4050a57 100644
--- a/packages/server/src/routes/index.ts
+++ b/packages/server/src/routes/index.ts
@@ -8,3 +8,4 @@ export { sessionsRouter } from './sessions.js';
 export { toolsRouter, registerTool, getRegisteredTools } from './tools.js';
 export { configRouter, getConfig, setConfig } from './config.js';
 export { filesRouter, setWorkingDirectory, getWorkingDirectory } from './files.js';
+export { commandsRouter } from './commands.js';
diff --git a/packages/server/src/types.ts b/packages/server/src/types.ts
index 00aa5bc..d58a9d4 100644
--- a/packages/server/src/types.ts
+++ b/packages/server/src/types.ts
@@ -141,3 +141,41 @@ export interface PaginatedResponse<T> {
   pageSize: number;
   hasMore: boolean;
 }
+
+// ============ Command 相关 ============
+
+export interface CommandInfo {
+  name: string;
+  description?: string;
+  agent?: string;
+  model?: string;
+  subtask?: boolean;
+  source: 'builtin' | 'user' | 'project';
+  hasTemplate: boolean;
+}
+
+export interface CommandSearchResult {
+  name: string;
+  description?: string;
+  source: string;
+  score: number;
+}
+
+export interface CommandExecuteResult {
+  prompt: string;
+  agent?: string;
+  model?: string;
+  subtask?: boolean;
+}
+
+export interface CommandListResponse {
+  commands: Array<{
+    name: string;
+    description?: string;
+    source: string;
+  }>;
+  stats: {
+    total: number;
+    bySource: Record<string, number>;
+  };
+}
diff --git a/packages/ui/src/api/client.ts b/packages/ui/src/api/client.ts
index 45cf938..5b48f7a 100644
--- a/packages/ui/src/api/client.ts
+++ b/packages/ui/src/api/client.ts
@@ -10,6 +10,10 @@ import type {
   FileReadResponse,
   FileTreeResponse,
   ServerConfig,
+  CommandInfo,
+  CommandSearchResult,
+  CommandExecuteResult,
+  CommandListResponse,
 } from './types.js';
 
 // Re-export types
@@ -23,6 +27,10 @@ export type {
   FileTreeNode,
   FileTreeResponse,
   ServerConfig,
+  CommandInfo,
+  CommandSearchResult,
+  CommandExecuteResult,
+  CommandListResponse,
 } from './types.js';
 
 // API Configuration
@@ -163,3 +171,35 @@ export async function updateConfig(
 ): Promise<{ success: boolean; data: ServerConfig }> {
   return request('PATCH', '/config', config);
 }
+
+// Commands
+export async function listCommands(): Promise<{ success: boolean; data: CommandListResponse }> {
+  return request('GET', '/commands');
+}
+
+export async function getCommand(name: string): Promise<{ success: boolean; data: CommandInfo }> {
+  return request('GET', `/commands/${encodeURIComponent(name)}`);
+}
+
+export async function executeCommand(
+  name: string,
+  args: string = ''
+): Promise<{ success: boolean; data?: CommandExecuteResult; error?: string }> {
+  return request('POST', `/commands/${encodeURIComponent(name)}/execute`, {
+    arguments: args,
+  });
+}
+
+export async function searchCommands(
+  query: string,
+  limit: number = 10
+): Promise<{ success: boolean; data: CommandSearchResult[] }> {
+  return request('POST', '/commands/search', { query, limit });
+}
+
+export async function reloadCommands(): Promise<{
+  success: boolean;
+  data: { message: string; stats: { total: number; bySource: Record<string, number> } };
+}> {
+  return request('POST', '/commands/reload');
+}
diff --git a/packages/ui/src/api/types.ts b/packages/ui/src/api/types.ts
index 18fb156..920bd66 100644
--- a/packages/ui/src/api/types.ts
+++ b/packages/ui/src/api/types.ts
@@ -90,3 +90,41 @@ export interface ServerConfig {
   allowedPaths: string[];
   deniedPaths: string[];
 }
+
+// ============ Command 相关 ============
+
+export interface CommandInfo {
+  name: string;
+  description?: string;
+  agent?: string;
+  model?: string;
+  subtask?: boolean;
+  source: string;
+  hasTemplate: boolean;
+}
+
+export interface CommandSearchResult {
+  name: string;
+  description?: string;
+  source: string;
+  score: number;
+}
+
+export interface CommandExecuteResult {
+  prompt: string;
+  agent?: string;
+  model?: string;
+  subtask?: boolean;
+}
+
+export interface CommandListResponse {
+  commands: Array<{
+    name: string;
+    description?: string;
+    source: string;
+  }>;
+  stats: {
+    total: number;
+    bySource: Record<string, number>;
+  };
+}