diff --git a/hub/src/feishu/slashCommands.ts b/hub/src/feishu/slashCommands.ts
new file mode 100644
index 0000000..4a9ca72
--- /dev/null
+++ b/hub/src/feishu/slashCommands.ts
@@ -0,0 +1,274 @@
+import type { PrismaClient } from "@prisma/client";
+import type { FastifyBaseLogger } from "fastify";
+import type { ModelRegistry, RoleEntry } from "../agent/models.js";
+import type { RuntimeSettings } from "../settings/runtime.js";
+import { sendText, type FeishuRuntime } from "./client.js";
+import type { TriggerQueue } from "./triggerQueue.js";
+
+export interface SlashInvocation {
+  readonly name: string;
+  readonly args: readonly string[];
+}
+
+export interface SlashCommandRunContext {
+  readonly invocation: SlashInvocation;
+  readonly projectId: string;
+  readonly chatId: string;
+  readonly rt: FeishuRuntime;
+}
+
+export interface SlashCommandDefinition {
+  readonly name: string;
+  readonly usage: string;
+  readonly summary: string;
+  readonly details: readonly string[];
+  run(context: SlashCommandRunContext): Promise<void>;
+}
+
+export interface SlashCommandRegistryDeps {
+  readonly prisma: PrismaClient;
+  readonly settings: RuntimeSettings;
+  readonly logger: FastifyBaseLogger;
+  readonly triggerQueue: TriggerQueue;
+}
+
+export function parseSlashInvocation(prompt: string): SlashInvocation | null {
+  const trimmed = prompt.trim();
+  if (!trimmed.startsWith("/")) return null;
+  const tokens = trimmed.split(/\s+/);
+  const rawCommand = tokens[0];
+  if (rawCommand === undefined || rawCommand.length <= 1) return null;
+  return {
+    name: rawCommand.slice(1),
+    args: tokens.slice(1),
+  };
+}
+
+export function parseSlashHelpSubcommand(invocation: SlashInvocation): string | null {
+  if (invocation.name === "help") return null;
+  return invocation.args.length === 1 && invocation.args[0] === "help"
+    ? invocation.name
+    : null;
+}
+
+export function createSlashCommandRegistry(deps: SlashCommandRegistryDeps): ReadonlyMap<string, SlashCommandDefinition> {
+  const commands = new Map<string, SlashCommandDefinition>();
+  const add = (command: SlashCommandDefinition): void => {
+    if (commands.has(command.name)) {
+      throw new Error(`duplicate slash command definition: /${command.name}`);
+    }
+    commands.set(command.name, command);
+  };
+
+  add({
+    name: "help",
+    usage: "/help [command]",
+    summary: "查看可用 slash 命令或单个命令说明。",
+    details: [
+      "不创建 agent run,也不改变当前会话。",
+      "支持 /help new 和 /new help 两种写法。",
+    ],
+    run: async ({ invocation, projectId, chatId, rt }) => {
+      const registry = await deps.settings.modelRegistry({ projectId });
+      await sendText(rt, chatId, formatHelpCommandInvocation(invocation, registry, commands));
+    },
+  });
+
+  add({
+    name: "new",
+    usage: "/new",
+    summary: "开新会话,下次 @bot 将从头开始。",
+    details: [
+      "归档当前未归档的 agent session。",
+      "不会清空当前项目的等待队列。",
+    ],
+    run: async ({ projectId, chatId, rt }) => {
+      await deps.prisma.agentSession.updateMany({
+        where: { projectId, archivedAt: null },
+        data: { archivedAt: new Date() },
+      });
+      await sendText(rt, chatId, "已开新会话,下次 @bot 将从头开始。");
+    },
+  });
+
+  add({
+    name: "resume",
+    usage: "/resume",
+    summary: "恢复最近一次已归档的会话。",
+    details: [
+      "只恢复当前项目最近归档的 agent session。",
+      "没有可恢复会话时只回复提示,不会创建 agent run。",
+    ],
+    run: async ({ projectId, chatId, rt }) => {
+      const latest = await deps.prisma.agentSession.findFirst({
+        where: { projectId, archivedAt: { not: null } },
+        orderBy: { archivedAt: "desc" },
+        select: { id: true },
+      });
+      if (latest === null) {
+        await sendText(rt, chatId, "没有可恢复的会话。");
+        return;
+      }
+      await deps.prisma.agentSession.update({
+        where: { id: latest.id },
+        data: { archivedAt: null },
+      });
+      await sendText(rt, chatId, "已恢复上一个会话。");
+    },
+  });
+
+  add({
+    name: "reset",
+    usage: "/reset",
+    summary: "重置当前会话并清空等待队列。",
+    details: [
+      "归档当前未归档的 agent session。",
+      "清空当前项目已经排队、尚未开始的触发请求。",
+    ],
+    run: async ({ projectId, chatId, rt }) => {
+      await deps.prisma.agentSession.updateMany({
+        where: { projectId, archivedAt: null },
+        data: { archivedAt: new Date() },
+      });
+      const cleared = deps.triggerQueue.clear(projectId);
+      if (cleared > 0) {
+        deps.logger.info({ projectId, cleared }, "feishu trigger: cleared queued triggers on reset");
+      }
+      await sendText(rt, chatId, "已重置,下次 @bot 将从头开始。");
+    },
+  });
+
+  return commands;
+}
+
+function formatHelpCommandInvocation(
+  invocation: SlashInvocation,
+  registry: ModelRegistry,
+  slashCommands: ReadonlyMap<string, SlashCommandDefinition>,
+): string {
+  if (invocation.args.length > 1) {
+    const helpCommand = slashCommands.get("help");
+    if (helpCommand === undefined) {
+      throw new Error("slash command registry is missing /help");
+    }
+    return [
+      "用法错误: /help 只接受一个命令名。",
+      "",
+      formatBuiltinSlashCommandHelp(helpCommand),
+    ].join("\n");
+  }
+
+  const target = invocation.args[0];
+  if (target === undefined) return formatSlashOverview(registry, slashCommands);
+  const normalizedTarget = normalizeHelpTarget(target);
+  if (normalizedTarget === "") return formatSlashOverview(registry, slashCommands);
+  return formatSlashHelpTarget(normalizedTarget, registry, slashCommands);
+}
+
+export function formatSlashHelpTarget(
+  target: string,
+  registry: ModelRegistry,
+  slashCommands: ReadonlyMap<string, SlashCommandDefinition>,
+): string {
+  const normalizedTarget = normalizeHelpTarget(target);
+  if (normalizedTarget === "") return formatSlashOverview(registry, slashCommands);
+  return formatSlashCommandHelp(normalizedTarget, registry, slashCommands) ?? formatUnknownSlashHelp(normalizedTarget, registry, slashCommands);
+}
+
+function normalizeHelpTarget(target: string): string {
+  return target.trim().replace(/^\/+/, "");
+}
+
+function formatSlashOverview(
+  registry: ModelRegistry,
+  slashCommands: ReadonlyMap<string, SlashCommandDefinition>,
+): string {
+  const lines = [
+    "可用 slash 命令:",
+    ...[...slashCommands.values()].map((command) => `/${command.name} - ${command.summary}`),
+  ];
+  const roles = visibleRoleCommands(registry, slashCommands);
+  if (roles.length > 0) {
+    lines.push("", "角色命令:");
+    for (const role of roles) {
+      lines.push(`/${role.id} <需求> - 使用“${role.label}”角色发起请求。`);
+    }
+  } else {
+    lines.push("", "当前没有配置角色命令。");
+  }
+  lines.push("", "查看单个命令: /help new 或 /new help。");
+  return lines.join("\n");
+}
+
+function formatSlashCommandHelp(
+  commandName: string,
+  registry: ModelRegistry,
+  slashCommands: ReadonlyMap<string, SlashCommandDefinition>,
+): string | null {
+  const normalizedName = normalizeHelpTarget(commandName);
+  const slashCommand = slashCommands.get(normalizedName);
+  if (slashCommand !== undefined) return formatBuiltinSlashCommandHelp(slashCommand);
+
+  const role = registry.role(normalizedName);
+  if (role === undefined) return null;
+  if (slashCommands.has(role.id)) return null;
+  return formatRoleSlashCommandHelp(role);
+}
+
+function formatBuiltinSlashCommandHelp(command: SlashCommandDefinition): string {
+  const helpUsage = command.name === "help"
+    ? "帮助: /help help"
+    : `帮助: /help ${command.name} 或 /${command.name} help`;
+  return [
+    `/${command.name}`,
+    command.summary,
+    "",
+    `用法: ${command.usage}`,
+    ...command.details.map((detail) => `- ${detail}`),
+    "",
+    helpUsage,
+  ].join("\n");
+}
+
+function formatRoleSlashCommandHelp(role: RoleEntry): string {
+  const lines = [
+    `/${role.id}`,
+    `使用“${role.label}”角色发起一次 agent run。`,
+    "",
+    `用法: /${role.id} <需求>`,
+    "- 真正运行时仍会按当前项目的 role.trigger 授权检查。",
+  ];
+  if (role.defaultModel !== undefined) {
+    lines.push(`- 默认模型: ${role.defaultModel}`);
+  }
+  lines.push(`- 工具范围: ${roleToolsDescription(role)}`, "", `帮助: /help ${role.id} 或 /${role.id} help`);
+  return lines.join("\n");
+}
+
+function roleToolsDescription(role: RoleEntry): string {
+  if (role.tools === undefined) return "全部已注册工具";
+  if (role.tools.length === 0) return "无";
+  return role.tools.join(", ");
+}
+
+function formatUnknownSlashHelp(
+  commandName: string,
+  registry: ModelRegistry,
+  slashCommands: ReadonlyMap<string, SlashCommandDefinition>,
+): string {
+  const normalizedName = normalizeHelpTarget(commandName);
+  return [
+    `未知 slash 命令 /${normalizedName}。`,
+    "",
+    formatSlashOverview(registry, slashCommands),
+  ].join("\n");
+}
+
+function visibleRoleCommands(
+  registry: ModelRegistry,
+  slashCommands: ReadonlyMap<string, SlashCommandDefinition>,
+): readonly RoleEntry[] {
+  return registry
+    .listRoles()
+    .filter((role) => !slashCommands.has(role.id));
+}
diff --git a/hub/src/feishu/trigger.ts b/hub/src/feishu/trigger.ts
index 44a5971..cb8bcbd 100644
--- a/hub/src/feishu/trigger.ts
+++ b/hub/src/feishu/trigger.ts
@@ -38,6 +38,7 @@ import { MessageBatcher, messageBatchKey, type MessageBatcherOptions } from "./m
 import { ApprovalManager } from "./approval.js";
 import { SenderNameCache } from "./senderCache.js";
 import { TriggerQueue, triggerQueue as defaultTriggerQueue, type QueuedTrigger } from "./triggerQueue.js";
+import { createSlashCommandRegistry, formatSlashHelpTarget, parseSlashHelpSubcommand, parseSlashInvocation } from "./slashCommands.js";
 
 export { ApprovalManager } from "./approval.js";
 export type { ApprovalResult, PendingApproval } from "./approval.js";
@@ -87,6 +88,12 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
   const runAgent = deps.runAgent ?? defaultRunAgent;
   const approvalManager = new ApprovalManager();
   const triggerQueue = deps.triggerQueue ?? defaultTriggerQueue;
+  const slashCommands = createSlashCommandRegistry({
+    prisma: deps.prisma,
+    settings: deps.settings,
+    logger: deps.logger,
+    triggerQueue,
+  });
   const batchContexts = new Map<string, TriggerRunContext>();
   // runId → AbortController for live runs. Registered when a run starts,
   // used by the interrupt card action to abort the SDK query, cleared in the
@@ -676,48 +683,23 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
     // batcher. Session commands bypass the lock because they don't create runs;
     // role/unknown slash prompts still use the normal run path and queue if locked.
     if (cleanPrompt.startsWith("/")) {
-      const cmd = cleanPrompt.split(/\s+/)[0];
-      switch (cmd) {
-        case "/new": {
-          await deps.prisma.agentSession.updateMany({
-            where: { projectId, archivedAt: null },
-            data: { archivedAt: new Date() },
-          });
-          await sendText(rt, chatId, "已开新会话,下次 @bot 将从头开始。");
-          return;
-        }
-        case "/resume": {
-          const latest = await deps.prisma.agentSession.findFirst({
-            where: { projectId, archivedAt: { not: null } },
-            orderBy: { archivedAt: "desc" },
-            select: { id: true },
-          });
-          if (latest === null) {
-            await sendText(rt, chatId, "没有可恢复的会话。");
-            return;
-          }
-          await deps.prisma.agentSession.update({
-            where: { id: latest.id },
-            data: { archivedAt: null },
-          });
-          await sendText(rt, chatId, "已恢复上一个会话。");
-          return;
-        }
-        case "/reset": {
-          await deps.prisma.agentSession.updateMany({
-            where: { projectId, archivedAt: null },
-            data: { archivedAt: new Date() },
-          });
-          const cleared = triggerQueue.clear(projectId);
-          if (cleared > 0) {
-            deps.logger.info({ projectId, cleared }, "feishu trigger: cleared queued triggers on reset");
-          }
-          await sendText(rt, chatId, "已重置,下次 @bot 将从头开始。");
-          return;
-        }
-        default:
-          break;
+      const invocation = parseSlashInvocation(cleanPrompt);
+      const helpSubcommandTarget = invocation === null ? null : parseSlashHelpSubcommand(invocation);
+      if (helpSubcommandTarget !== null) {
+        // Help is generated on demand because role/tool configuration is runtime data.
+        const models = await deps.settings.modelRegistry({ projectId });
+        await sendText(rt, chatId, formatSlashHelpTarget(helpSubcommandTarget, models, slashCommands));
+        return;
       }
+
+      if (invocation !== null) {
+        const slashCommand = slashCommands.get(invocation.name);
+        if (slashCommand !== undefined) {
+          await slashCommand.run({ invocation, projectId, chatId, rt });
+          return;
+        }
+      }
+
       await startAgentRun(runContext, cleanPrompt);
       return;
     }
@@ -1037,11 +1019,12 @@ async function downloadPostMessageFiles(args: {
     await downloadMessageFile(args.rt, args.msg.message_id, fileKey, savePath);
   }
 }
+
 /**
  * Parse a leading `/<role>` command from a prompt (e.g. `/draft 帮我写教案`).
  * Returns the role id and the remaining prompt with the command stripped.
- * Control commands already handled upstream (`/new`, `/resume`, `/reset`) are
- * ignored here — they never reach this function.
+ * Control/help commands already handled upstream are ignored here — they never
+ * reach this function.
  *
  * Unknown `/foo` that isn't a registered role: returns `null` role and the
  * original prompt unchanged (the slash is treated as literal text). Role
diff --git a/hub/test/integration/trigger.test.ts b/hub/test/integration/trigger.test.ts
index d8c3644..585fd0a 100644
--- a/hub/test/integration/trigger.test.ts
+++ b/hub/test/integration/trigger.test.ts
@@ -168,6 +168,121 @@ describe("trigger full lifecycle (integration)", () => {
     expect(await prisma.agentRun.findMany()).toHaveLength(0);
   });
 
+  it("/help lists control and role commands without creating a run", async () => {
+    await seedProject("proj-help", "chat-help");
+    const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+
+    await trigger(makeEvent("chat-help", "@_user_1 /help"), rt);
+
+    const helpText = rt.sentTexts.at(-1) ?? "";
+    expect(helpText).toContain("可用 slash 命令");
+    expect(helpText).toContain("/new");
+    expect(helpText).toContain("/reset");
+    expect(helpText).toContain("/draft <需求>");
+    expect(helpText).toContain("/review <需求>");
+    expect(runAgentCalls).toHaveLength(0);
+    expect(await prisma.agentRun.findMany()).toHaveLength(0);
+  });
+
+  it("/help is built from the current registry on each request", async () => {
+    await seedProject("proj-help-live", "chat-help-live");
+    let currentModels = new InMemoryModelRegistry(
+      [{ id: "mock-model", label: "Mock", toolCapable: true }],
+      [{ id: "draft", label: "草稿", defaultModel: "mock-model", systemPrompt: undefined, tools: undefined }],
+    );
+    const dynamicSettings: RuntimeSettings = {
+      async provider(providerId, scope) {
+        return settings.provider(providerId, scope);
+      },
+      async modelRegistry() {
+        return currentModels;
+      },
+      async runPolicy(input) {
+        return settings.runPolicy(input);
+      },
+    };
+    const trigger = makeTriggerHandler({ prisma, settings: dynamicSettings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+
+    await trigger(makeEvent("chat-help-live", "@_user_1 /help"), rt);
+    expect(rt.sentTexts.at(-1) ?? "").not.toContain("/coach <需求>");
+
+    currentModels = new InMemoryModelRegistry(
+      [{ id: "mock-model", label: "Mock", toolCapable: true }],
+      [
+        { id: "draft", label: "草稿", defaultModel: "mock-model", systemPrompt: undefined, tools: undefined },
+        { id: "coach", label: "教练", defaultModel: "mock-model", systemPrompt: undefined, tools: [] },
+      ],
+    );
+
+    await trigger(makeEvent("chat-help-live", "@_user_1 /help"), rt);
+
+    const helpText = rt.sentTexts.at(-1) ?? "";
+    expect(helpText).toContain("/coach <需求>");
+    expect(runAgentCalls).toHaveLength(0);
+    expect(await prisma.agentRun.findMany()).toHaveLength(0);
+  });
+
+  it("/help <command> returns command-specific help", async () => {
+    await seedProject("proj-help-reset", "chat-help-reset");
+    const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+
+    await trigger(makeEvent("chat-help-reset", "@_user_1 /help reset"), rt);
+
+    const helpText = rt.sentTexts.at(-1) ?? "";
+    expect(helpText).toContain("/reset");
+    expect(helpText).toContain("清空当前项目已经排队");
+    expect(helpText).toContain("/reset help");
+    expect(runAgentCalls).toHaveLength(0);
+    expect(await prisma.agentRun.findMany()).toHaveLength(0);
+  });
+
+  it("control commands support a help subcommand", async () => {
+    await seedProject("proj-new-help", "chat-new-help");
+    const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+
+    await trigger(makeEvent("chat-new-help", "@_user_1 /new help"), rt);
+
+    const helpText = rt.sentTexts.at(-1) ?? "";
+    expect(helpText).toContain("/new");
+    expect(helpText).toContain("归档当前未归档");
+    expect(helpText).toContain("/help new");
+    expect(rt.sentTexts).not.toContain("已开新会话,下次 @bot 将从头开始。");
+    expect(runAgentCalls).toHaveLength(0);
+    expect(await prisma.agentRun.findMany()).toHaveLength(0);
+  });
+
+  it("role commands support a help subcommand without consuming role grants", async () => {
+    await seedProject("proj-role-help", "chat-role-help");
+    await prisma.roleTriggerGrant.create({
+      data: { projectId: "proj-role-help", roleId: "review", principalType: "USER", principalId: "ou_other" },
+    });
+    const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+
+    await trigger(makeEvent("chat-role-help", "@_user_1 /review help"), rt);
+
+    const helpText = rt.sentTexts.at(-1) ?? "";
+    expect(helpText).toContain("/review");
+    expect(helpText).toContain("使用“审校”角色");
+    expect(helpText).toContain("工具范围: read_file");
+    expect(rt.sentTexts).not.toContain("无权限使用角色 review。");
+    expect(runAgentCalls).toHaveLength(0);
+    expect(await prisma.agentRun.findMany()).toHaveLength(0);
+  });
+
+  it("/help unknown and /unknown help report the unknown command", async () => {
+    await seedProject("proj-help-unknown", "chat-help-unknown");
+    const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+
+    await trigger(makeEvent("chat-help-unknown", "@_user_1 /help unknown"), rt);
+    expect(rt.sentTexts.at(-1) ?? "").toContain("未知 slash 命令 /unknown");
+    expect(runAgentCalls).toHaveLength(0);
+
+    await trigger(makeEvent("chat-help-unknown", "@_user_1 /unknown help"), rt);
+    expect(rt.sentTexts.at(-1) ?? "").toContain("未知 slash 命令 /unknown");
+    expect(runAgentCalls).toHaveLength(0);
+    expect(await prisma.agentRun.findMany()).toHaveLength(0);
+  });
+
   it("rejects a sender without edit grant (ADR-0004)", async () => {
     await seedProject("proj-2", "chat-2", { role: "READ" });
     const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
diff --git a/hub/test/unit/slash-commands.test.ts b/hub/test/unit/slash-commands.test.ts
new file mode 100644
index 0000000..6a91924
--- /dev/null
+++ b/hub/test/unit/slash-commands.test.ts
@@ -0,0 +1,17 @@
+import { describe, expect, it } from "vitest";
+import { parseSlashHelpSubcommand, parseSlashInvocation } from "../../src/feishu/slashCommands.js";
+
+describe("slash command parser", () => {
+  it("parses a slash invocation without resolving it", () => {
+    expect(parseSlashInvocation("/new")).toEqual({ name: "new", args: [] });
+    expect(parseSlashInvocation("/review 看看这节")).toEqual({ name: "review", args: ["看看这节"] });
+    expect(parseSlashInvocation("写教案")).toBeNull();
+  });
+
+  it("parses help subcommands only in the exact /<command> help form", () => {
+    expect(parseSlashHelpSubcommand({ name: "new", args: ["help"] })).toBe("new");
+    expect(parseSlashHelpSubcommand({ name: "unknown", args: ["help"] })).toBe("unknown");
+    expect(parseSlashHelpSubcommand({ name: "new", args: ["help", "please"] })).toBeNull();
+    expect(parseSlashHelpSubcommand({ name: "help", args: ["new"] })).toBeNull();
+  });
+});