fix(cli): improve command conflict handling for skills

- Prioritize built-in commands in slashCommandProcessor to ensure they retain their intended names.
- Add extensionName to SkillDefinition to track source extensions.
- Update ExtensionManager to tag loaded skills with their source extension name.
- Update SlashCommandResolver and SlashCommandConflictHandler to properly handle and describe conflicts involving skills.
- Skill conflicts from extensions now produce clear notifications like "Extension 'google-workspace' skill '/chat' was renamed to '/google-workspace.chat'" instead of generic "Existing command" messages.

Fixes built-in command rename issues observed on startup.

packages/cli/src/config/extension-manager.ts

@@ -891,9 +891,10 @@ Would you like to attempt to install via "git clone" instead?`,
       let skills = await loadSkillsFromDir(
         path.join(effectiveExtensionPath, 'skills'),
       );
-      skills = skills.map((skill) =>
-        recursivelyHydrateStrings(skill, hydrationContext),
-      );
+      skills = skills.map((skill) => ({
+        ...recursivelyHydrateStrings(skill, hydrationContext),
+        extensionName: config.name,
+      }));
 
       let rules: PolicyRule[] | undefined;
       let checkers: SafetyCheckerRule[] | undefined;
@@ -916,9 +917,10 @@ Would you like to attempt to install via "git clone" instead?`,
       const agentLoadResult = await loadAgentsFromDirectory(
         path.join(effectiveExtensionPath, 'agents'),
       );
-      agentLoadResult.agents = agentLoadResult.agents.map((agent) =>
-        recursivelyHydrateStrings(agent, hydrationContext),
-      );
+      agentLoadResult.agents = agentLoadResult.agents.map((agent) => ({
+        ...recursivelyHydrateStrings(agent, hydrationContext),
+        extensionName: config.name,
+      }));
 
       // Log errors but don't fail the entire extension load
       for (const error of agentLoadResult.errors) {

packages/cli/src/services/SkillCommandLoader.test.ts

@@ -122,4 +122,16 @@ describe('SkillCommandLoader', () => {
     const actionResult = (await commands[0].action!({} as any, '')) as any;
     expect(actionResult.toolArgs).toEqual({ name: 'my awesome skill' });
   });
+
+  it('should propagate extensionName to the generated slash command', async () => {
+    const mockSkills = [
+      { name: 'skill1', description: 'desc', extensionName: 'ext1' },
+    ];
+    mockSkillManager.getDisplayableSkills.mockReturnValue(mockSkills);
+
+    const loader = new SkillCommandLoader(mockConfig);
+    const commands = await loader.loadCommands(new AbortController().signal);
+
+    expect(commands[0].extensionName).toBe('ext1');
+  });
 });

packages/cli/src/services/SkillCommandLoader.ts

@@ -41,6 +41,7 @@ export class SkillCommandLoader implements ICommandLoader {
         description: skill.description || `Activate the ${skill.name} skill`,
         kind: CommandKind.SKILL,
         autoExecute: true,
+        extensionName: skill.extensionName,
         action: async (_context, args) => ({
           type: 'tool',
           toolName: ACTIVATE_SKILL_TOOL_NAME,

packages/cli/src/services/SlashCommandConflictHandler.test.ts

@@ -172,4 +172,23 @@ describe('SlashCommandConflictHandler', () => {
     vi.advanceTimersByTime(600);
     expect(coreEvents.emitFeedback).not.toHaveBeenCalled();
   });
+
+  it('should display a descriptive message for a skill conflict', () => {
+    simulateEvent([
+      {
+        name: 'chat',
+        renamedTo: 'google-workspace.chat',
+        loserExtensionName: 'google-workspace',
+        loserKind: CommandKind.SKILL,
+        winnerKind: CommandKind.BUILT_IN,
+      },
+    ]);
+
+    vi.advanceTimersByTime(600);
+
+    expect(coreEvents.emitFeedback).toHaveBeenCalledWith(
+      'info',
+      "Extension 'google-workspace' skill '/chat' was renamed to '/google-workspace.chat' because it conflicts with built-in command.",
+    );
+  });
 });

packages/cli/src/services/SlashCommandConflictHandler.ts

@@ -154,6 +154,10 @@ export class SlashCommandConflictHandler {
         return extensionName
           ? `extension '${extensionName}' command`
           : 'extension command';
+      case CommandKind.SKILL:
+        return extensionName
+          ? `extension '${extensionName}' skill`
+          : 'skill command';
       case CommandKind.MCP_PROMPT:
         return mcpServerName
           ? `MCP server '${mcpServerName}' command`

packages/cli/src/services/SlashCommandResolver.test.ts

@@ -173,5 +173,30 @@ describe('SlashCommandResolver', () => {
 
       expect(finalCommands.find((c) => c.name === 'gcp.deploy1')).toBeDefined();
     });
+
+    it('should prefix skills with extension name when they conflict with built-in', () => {
+      const builtin = createMockCommand('chat', CommandKind.BUILT_IN);
+      const skill = {
+        ...createMockCommand('chat', CommandKind.SKILL),
+        extensionName: 'google-workspace',
+      };
+
+      const { finalCommands } = SlashCommandResolver.resolve([builtin, skill]);
+
+      const names = finalCommands.map((c) => c.name);
+      expect(names).toContain('chat');
+      expect(names).toContain('google-workspace.chat');
+    });
+
+    it('should NOT prefix skills with "skill" when extension name is missing', () => {
+      const builtin = createMockCommand('chat', CommandKind.BUILT_IN);
+      const skill = createMockCommand('chat', CommandKind.SKILL);
+
+      const { finalCommands } = SlashCommandResolver.resolve([builtin, skill]);
+
+      const names = finalCommands.map((c) => c.name);
+      expect(names).toContain('chat');
+      expect(names).toContain('chat1');
+    });
   });
 });

packages/cli/src/services/SlashCommandResolver.ts

@@ -174,6 +174,7 @@ export class SlashCommandResolver {
   private static getPrefix(cmd: SlashCommand): string | undefined {
     switch (cmd.kind) {
       case CommandKind.EXTENSION_FILE:
+      case CommandKind.SKILL:
         return cmd.extensionName;
       case CommandKind.MCP_PROMPT:
         return cmd.mcpServerName;
@@ -185,7 +186,6 @@ export class SlashCommandResolver {
         return undefined;
     }
   }
-
   /**
    * Logs a conflict event.
    */

packages/cli/src/ui/hooks/slashCommandProcessor.ts

@@ -325,9 +325,9 @@ export const useSlashCommandProcessor = (
     (async () => {
       const commandService = await CommandService.create(
         [
+          new BuiltinCommandLoader(config),
           new SkillCommandLoader(config),
           new McpPromptLoader(config),
-          new BuiltinCommandLoader(config),
           new FileCommandLoader(config),
         ],
         controller.signal,

packages/core/src/code_assist/oauth2.test.ts

@@ -480,6 +480,7 @@ describe('oauth2', () => {
       expect(fs.existsSync(googleAccountPath)).toBe(true);
       if (fs.existsSync(googleAccountPath)) {
         const cachedGoogleAccount = fs.readFileSync(googleAccountPath, 'utf-8');
+
         expect(JSON.parse(cachedGoogleAccount)).toEqual({
           active: 'test-user-code-account@gmail.com',
           old: [],
@@ -1349,7 +1350,7 @@ describe('oauth2', () => {
         let dataHandler: ((data: Buffer) => void) | undefined;
         await vi.waitFor(() => {
           const dataCall = stdinOnSpy.mock.calls.find(
-            (call: [string, ...unknown[]]) => call[0] === 'data',
+            (call: [string | symbol, ...unknown[]]) => call[0] === 'data',
           );
           dataHandler = dataCall?.[1] as ((data: Buffer) => void) | undefined;
           if (!dataHandler) throw new Error('stdin handler not registered yet');

packages/core/src/skills/skillLoader.ts

@@ -27,6 +27,8 @@ export interface SkillDefinition {
   disabled?: boolean;
   /** Whether the skill is a built-in skill. */
   isBuiltin?: boolean;
+  /** The name of the extension that provided this skill, if any. */
+  extensionName?: string;
 }
 
 export const FRONTMATTER_REGEX =

packages/core/src/telemetry/memory-monitor.test.ts

@@ -89,6 +89,7 @@ const mockHeapStatistics = {
   total_global_handles_size: 8192,
   used_global_handles_size: 4096,
   external_memory: 2097152,
+  total_allocated_bytes: 31457280,
 };
 
 const mockHeapSpaceStatistics = [