Refactor PolicyEngine to Core Package (#12325)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

packages/cli/src/ui/commands/policiesCommand.ts

@@ -0,0 +1,73 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { CommandKind, type SlashCommand } from './types.js';
+import { MessageType } from '../types.js';
+
+const listPoliciesCommand: SlashCommand = {
+  name: 'list',
+  description: 'List all active policies',
+  kind: CommandKind.BUILT_IN,
+  action: async (context) => {
+    const { config } = context.services;
+    if (!config) {
+      context.ui.addItem(
+        {
+          type: MessageType.ERROR,
+          text: 'Error: Config not available.',
+        },
+        Date.now(),
+      );
+      return;
+    }
+
+    const policyEngine = config.getPolicyEngine();
+    const rules = policyEngine.getRules();
+
+    if (rules.length === 0) {
+      context.ui.addItem(
+        {
+          type: MessageType.INFO,
+          text: 'No active policies.',
+        },
+        Date.now(),
+      );
+      return;
+    }
+
+    let content = '**Active Policies**\n\n';
+    rules.forEach((rule, index) => {
+      content += `${index + 1}. **${rule.decision.toUpperCase()}**`;
+      if (rule.toolName) {
+        content += ` tool: \`${rule.toolName}\``;
+      } else {
+        content += ` all tools`;
+      }
+      if (rule.argsPattern) {
+        content += ` (args match: \`${rule.argsPattern.source}\`)`;
+      }
+      if (rule.priority !== undefined) {
+        content += ` [Priority: ${rule.priority}]`;
+      }
+      content += '\n';
+    });
+
+    context.ui.addItem(
+      {
+        type: MessageType.INFO,
+        text: content,
+      },
+      Date.now(),
+    );
+  },
+};
+
+export const policiesCommand: SlashCommand = {
+  name: 'policies',
+  description: 'Manage policies',
+  kind: CommandKind.BUILT_IN,
+  subCommands: [listPoliciesCommand],
+};