diff --git a/AGENTS.md b/AGENTS.md
index 38638ccb..6e2080b6 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -107,7 +107,7 @@ Step Realtime CLI 采用分层 monorepo 架构，默认依赖方向如下：
 - `extensions/realtime-aec/`：基于 Chrome 的 AEC 适配
 - 其他第三方系统集成（IM / Email / storage / vector db / search backend 等）
 
-扩展目录只负责外部系统对接，不负责核心编排语义。realtime-* 系列适配器统一依赖 `packages/realtime` 暴露的协议层。
+扩展目录只负责外部系统对接，不负责核心编排语义。realtime-\* 系列适配器统一依赖 `packages/realtime` 暴露的协议层。
 
 ### `src/gateway/`
 
@@ -311,7 +311,7 @@ TUI / UI / CLI / Desktop 默认通过 `packages/sdk` 调用 gateway：
 - 新增 CLI 子命令注册：`src/commands/`
 - 新增本地 CLI / TUI 运行时装配：`src/runtime/`
 - 新增内置工具或技能：`skills/`
-- 新增第三方集成或通道（含 LLM / MCP / realtime-* 适配）：`extensions/`
+- 新增第三方集成或通道（含 LLM / MCP / realtime-\* 适配）：`extensions/`
 - 新增服务端宿主能力：`src/gateway/`
 - 新增默认 CLI 客户端实现：`src/cli/`
 - 新增界面与交互：`src/tui/`、`ui/`、`apps/*`
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c9b6f2e4..5c27843e 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -9,6 +9,7 @@ git clone <your-fork-url>
 cd step-realtime-cli
 pnpm install
 pnpm step --help          # run locally without building
+pnpm test                 # run the automated test suite
 pnpm check                # required before opening a PR
 ```
 
@@ -36,6 +37,10 @@ platform-specific code (audio drivers, Chrome finder, etc.), use
 `vi.skipIf` / `describe.runIf` rather than hardcoded platform skips so that
 every test file still loads on every platform.
 
+For UI, voice, or service-facing changes, also verify behavior manually with
+`pnpm step` / `pnpm gateway:watch` / `pnpm tui:dev` / `pnpm ui:dev` as
+appropriate for the change.
+
 ## Architecture
 
 Read [`AGENTS.md`](./AGENTS.md) first — it lays out the layered monorepo
diff --git a/README.md b/README.md
index fa35a853..45c52f6c 100644
--- a/README.md
+++ b/README.md
@@ -30,10 +30,10 @@
 
 StepFun operates two independent sites; pick the one that matches where your API key was issued. The two sites do **not** share accounts or keys.
 
-| Region | Console | API endpoint | Installer |
-| --- | --- | --- | --- |
-| Mainland China (default) | https://platform.stepfun.com/ | `https://api.stepfun.com` | `bash scripts/setup.sh` |
-| Overseas | https://platform.stepfun.ai/ | `https://api.stepfun.ai` | `bash scripts/setup-overseas.sh` |
+| Region                   | Console                       | API endpoint              | Installer                        |
+| ------------------------ | ----------------------------- | ------------------------- | -------------------------------- |
+| Mainland China (default) | https://platform.stepfun.com/ | `https://api.stepfun.com` | `bash scripts/setup.sh`          |
+| Overseas                 | https://platform.stepfun.ai/  | `https://api.stepfun.ai`  | `bash scripts/setup-overseas.sh` |
 
 `scripts/setup-overseas.sh` runs the same flow as `scripts/setup.sh` and then rewrites `~/.step-cli/config.json` so both the realtime WebSocket and the models-proxy base URL point at `api.stepfun.ai`. All other flags (`--skip-build`, `--force-config`, `--uninstall`, …) are forwarded verbatim.
 
diff --git a/README_CN.md b/README_CN.md
index 846f05f2..e79f9a16 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -30,10 +30,10 @@
 
 StepFun 提供两个相互独立的站点，请按 API Key 的发放来源选择对应安装方式。两个站点的账号与密钥**不互通**。
 
-| 站点 | 控制台 | API 域名 | 安装脚本 |
-| --- | --- | --- | --- |
-| 国内（默认） | https://platform.stepfun.com/ | `https://api.stepfun.com` | `bash scripts/setup.sh` |
-| 海外 | https://platform.stepfun.ai/ | `https://api.stepfun.ai` | `bash scripts/setup-overseas.sh` |
+| 站点         | 控制台                        | API 域名                  | 安装脚本                         |
+| ------------ | ----------------------------- | ------------------------- | -------------------------------- |
+| 国内（默认） | https://platform.stepfun.com/ | `https://api.stepfun.com` | `bash scripts/setup.sh`          |
+| 海外         | https://platform.stepfun.ai/  | `https://api.stepfun.ai`  | `bash scripts/setup-overseas.sh` |
 
 `scripts/setup-overseas.sh` 会先复用 `scripts/setup.sh` 的全部流程，再把 `~/.step-cli/config.json` 中实时语音的 WebSocket 端点与 models-proxy 基础地址改写为 `api.stepfun.ai`。所有其他参数（`--skip-build`、`--force-config`、`--uninstall` 等）均会原样转发。
 
diff --git a/extensions/llm/src/factory.test.ts b/extensions/llm/src/factory.test.ts
index 344b7481..603d71d7 100644
--- a/extensions/llm/src/factory.test.ts
+++ b/extensions/llm/src/factory.test.ts
@@ -1,7 +1,5 @@
 import { describe, it, expect } from "vitest";
-import type {
-  CompletionRequest,
-} from "@step-cli/protocol";
+import type { CompletionRequest } from "@step-cli/protocol";
 import { createChatCompletionClient } from "./factory.js";
 import { AnthropicMessagesClient } from "./anthropic-client.js";
 import { OpenAICompatibleClient } from "./openai-client.js";
diff --git a/packages/core/src/policy/tool-policy.test.ts b/packages/core/src/policy/tool-policy.test.ts
index 77595d65..6885ebbe 100644
--- a/packages/core/src/policy/tool-policy.test.ts
+++ b/packages/core/src/policy/tool-policy.test.ts
@@ -203,6 +203,89 @@ describe("ToolPolicy", () => {
     expect(decision.mode).toBe("deny");
   });
 
+  it("denies encoded destructive shell commands", () => {
+    const policy = new ToolPolicy({
+      mode: "confirm",
+      nonInteractiveApproval: "deny",
+    });
+    const spec = makeToolSpec({ name: "bash", risk: "execute" });
+    const inspection: ToolCallInspection = {
+      command: "bash -c 'cm0gLXJmIC8= | base64 -d | sh'",
+    };
+
+    const decision = policy.evaluate("bash", "{}", spec, inspection);
+    expect(decision.mode).toBe("deny");
+    expect(decision.reason).toMatch(/dangerous command/i);
+  });
+
+  it("allows benign encoded text", () => {
+    const policy = new ToolPolicy({
+      mode: "confirm",
+      nonInteractiveApproval: "deny",
+    });
+    const spec = makeToolSpec({ name: "bash", risk: "execute" });
+    const inspection: ToolCallInspection = { command: "echo SGVsbG8=" };
+
+    const decision = policy.evaluate("bash", "{}", spec, inspection);
+    expect(decision.mode).toBe("confirm");
+  });
+
+  it("denies destructive rm paths beyond filesystem root", () => {
+    const policy = new ToolPolicy({
+      mode: "auto",
+      nonInteractiveApproval: "allow",
+    });
+    const spec = makeToolSpec({ name: "bash", risk: "execute" });
+    const inspection: ToolCallInspection = { command: "rm -rf /tmp/test" };
+
+    const decision = policy.evaluate("bash", "{}", spec, inspection);
+    expect(decision.mode).toBe("deny");
+    expect(decision.reason).toMatch(/dangerous command/i);
+  });
+
+  it("denies destructive find delete variants", () => {
+    const policy = new ToolPolicy({
+      mode: "auto",
+      nonInteractiveApproval: "allow",
+    });
+    const spec = makeToolSpec({ name: "bash", risk: "execute" });
+    const inspection: ToolCallInspection = {
+      command: "find / -mindepth 1 -delete",
+    };
+
+    const decision = policy.evaluate("bash", "{}", spec, inspection);
+    expect(decision.mode).toBe("deny");
+    expect(decision.reason).toMatch(/dangerous command/i);
+  });
+
+  it("denies destructive workspace wipe variants", () => {
+    const policy = new ToolPolicy({
+      mode: "auto",
+      nonInteractiveApproval: "allow",
+    });
+    const spec = makeToolSpec({ name: "bash", risk: "execute" });
+    const inspection: ToolCallInspection = {
+      command: "find . -mindepth 1 -delete",
+    };
+
+    const decision = policy.evaluate("bash", "{}", spec, inspection);
+    expect(decision.mode).toBe("deny");
+    expect(decision.reason).toMatch(/dangerous command/i);
+  });
+
+  it("denies git clean forced delete variants", () => {
+    const policy = new ToolPolicy({
+      mode: "auto",
+      nonInteractiveApproval: "allow",
+    });
+    const spec = makeToolSpec({ name: "bash", risk: "execute" });
+    const inspection: ToolCallInspection = { command: "git clean -fdx" };
+
+    const decision = policy.evaluate("bash", "{}", spec, inspection);
+    expect(decision.mode).toBe("deny");
+    expect(decision.reason).toMatch(/dangerous command/i);
+  });
+
   // -- Per-tool override precedence --
 
   it("per-tool override takes precedence over mode-based decision", () => {
diff --git a/packages/core/src/policy/tool-policy.ts b/packages/core/src/policy/tool-policy.ts
index 1254b366..17836c14 100644
--- a/packages/core/src/policy/tool-policy.ts
+++ b/packages/core/src/policy/tool-policy.ts
@@ -18,7 +18,9 @@ export interface ToolPolicyConfig {
 }
 
 const DANGEROUS_COMMAND_PATTERNS: RegExp[] = [
-  /\brm\s+-rf\s+\//i,
+  /\brm\s+-(?:[^\s-]*r[^\s-]*f|[^\s-]*f[^\s-]*r)\s+(?:--\s+)?(?:\/(?:\S*)?|~(?:\/\S*)?|\$HOME(?:\/\S*)?|\.\.?(?:\/\S*)?)(?:\s|$)/i,
+  /\bfind\s+(?:\/(?:\S*)?|~(?:\/\S*)?|\$HOME(?:\/\S*)?|\.\.?(?:\/\S*)?)(?:\s|$)[\s\S]*\s-delete(?:\s|$)/i,
+  /\bgit\s+clean\s+-[^\s]*f[^\s]*d/i,
   /\bshutdown\b/i,
   /\breboot\b/i,
   /\bmkfs\b/i,
@@ -176,7 +178,21 @@ export class ToolPolicy implements ToolPermissionPolicy {
 
 function isDangerousCommand(command: string): boolean {
   const normalized = command.trim();
-  return DANGEROUS_COMMAND_PATTERNS.some((pattern) => pattern.test(normalized));
+  if (DANGEROUS_COMMAND_PATTERNS.some((pattern) => pattern.test(normalized))) {
+    return true;
+  }
+
+  return extractBase64Candidates(normalized).some((candidate) => {
+    try {
+      const decoded = Buffer.from(candidate, "base64").toString("utf8").trim();
+      return (
+        shouldInspectDecodedCommand(decoded) &&
+        DANGEROUS_COMMAND_PATTERNS.some((pattern) => pattern.test(decoded))
+      );
+    } catch {
+      return false;
+    }
+  });
 }
 
 function shorten(text: string, maxChars: number): string {
@@ -185,3 +201,22 @@ function shorten(text: string, maxChars: number): string {
   }
   return `${text.slice(0, Math.max(0, maxChars - 3))}...`;
 }
+
+function extractBase64Candidates(command: string): string[] {
+  return command.match(/\b[A-Za-z0-9+/]{8,256}={0,2}\b/g) ?? [];
+}
+
+function shouldInspectDecodedCommand(decoded: string): boolean {
+  if (decoded.length < 4) {
+    return false;
+  }
+
+  if (!/^[\t\n\r\x20-\x7e]+$/.test(decoded)) {
+    return false;
+  }
+
+  return (
+    /[|;&`$()<>]/.test(decoded) ||
+    DANGEROUS_COMMAND_PATTERNS.some((pattern) => pattern.test(decoded))
+  );
+}
diff --git a/packages/core/src/tools/security.test.ts b/packages/core/src/tools/security.test.ts
index cd3b6c04..4a78493e 100644
--- a/packages/core/src/tools/security.test.ts
+++ b/packages/core/src/tools/security.test.ts
@@ -1,8 +1,5 @@
 import { describe, it, expect } from "vitest";
-import {
-  getToolSecurityIssue,
-  validateToolSecurity,
-} from "./security.js";
+import { getToolSecurityIssue, validateToolSecurity } from "./security.js";
 
 describe("security", () => {
   // -- getToolSecurityIssue ----------------------------------------------
diff --git a/packages/utils/src/clarification.test.ts b/packages/utils/src/clarification.test.ts
index 72009f1d..7350c0c9 100644
--- a/packages/utils/src/clarification.test.ts
+++ b/packages/utils/src/clarification.test.ts
@@ -1,5 +1,8 @@
 import { describe, it, expect } from "vitest";
-import type { UserClarificationRequest, UserClarificationOption } from "@step-cli/protocol";
+import type {
+  UserClarificationRequest,
+  UserClarificationOption,
+} from "@step-cli/protocol";
 import {
   parseClarificationAnswer,
   formatClarificationOption,
diff --git a/packages/utils/src/terminal-text.test.ts b/packages/utils/src/terminal-text.test.ts
index e2040072..0bef9dbe 100644
Binary files a/packages/utils/src/terminal-text.test.ts and b/packages/utils/src/terminal-text.test.ts differ