diff --git a/package.json b/package.json
index 3260321..28631cc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "imap-sdk",
-  "version": "1.1.2",
+  "version": "1.1.3",
   "description": "IMAP SDK for Node",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/src/shell/client/index.test.ts b/src/shell/client/index.test.ts
new file mode 100644
index 0000000..f76994d
--- /dev/null
+++ b/src/shell/client/index.test.ts
@@ -0,0 +1,100 @@
+import { IMAPClient } from './index'
+
+type TestableClient = {
+  _capabilities: Set<string>
+  enableExtensions: () => Promise<void>
+  run: IMAPClient['run']
+}
+
+const createTestClient = (): TestableClient =>
+  new IMAPClient({
+    host: 'imap.example.com',
+    logger: false,
+    port: 993,
+    secure: true,
+  }) as unknown as TestableClient
+
+describe('IMAPClient', () => {
+  describe('enableExtensions', () => {
+    it('should enable CONDSTORE when capability is present', async () => {
+      const client = createTestClient()
+      const runCalls: { command: string; args: unknown[] }[] = []
+
+      client._capabilities = new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE'])
+      client.run = ((command: string, ...args: unknown[]) => {
+        runCalls.push({ args, command })
+        return Promise.resolve(new Set(['CONDSTORE']))
+      }) as typeof client.run
+
+      await client.enableExtensions()
+
+      expect(runCalls.length).toBe(1)
+      expect(runCalls[0].command).toBe('ENABLE')
+      expect(runCalls[0].args).toEqual([['CONDSTORE']])
+    })
+
+    it('should enable QRESYNC when capability is present', async () => {
+      const client = createTestClient()
+      const runCalls: { command: string; args: unknown[] }[] = []
+
+      client._capabilities = new Set(['IMAP4rev1', 'ENABLE', 'QRESYNC'])
+      client.run = ((command: string, ...args: unknown[]) => {
+        runCalls.push({ args, command })
+        return Promise.resolve(new Set(['QRESYNC']))
+      }) as typeof client.run
+
+      await client.enableExtensions()
+
+      expect(runCalls.length).toBe(1)
+      expect(runCalls[0].args).toEqual([['QRESYNC']])
+    })
+
+    it('should enable UTF8=ACCEPT when capability is present', async () => {
+      const client = createTestClient()
+      const runCalls: { command: string; args: unknown[] }[] = []
+
+      client._capabilities = new Set(['IMAP4rev1', 'ENABLE', 'UTF8=ACCEPT'])
+      client.run = ((command: string, ...args: unknown[]) => {
+        runCalls.push({ args, command })
+        return Promise.resolve(new Set(['UTF8=ACCEPT']))
+      }) as typeof client.run
+
+      await client.enableExtensions()
+
+      expect(runCalls.length).toBe(1)
+      expect(runCalls[0].args).toEqual([['UTF8=ACCEPT']])
+    })
+
+    it('should enable all supported extensions when present', async () => {
+      const client = createTestClient()
+      const runCalls: { command: string; args: unknown[] }[] = []
+
+      client._capabilities = new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE', 'QRESYNC', 'UTF8=ACCEPT'])
+      client.run = ((command: string, ...args: unknown[]) => {
+        runCalls.push({ args, command })
+        return Promise.resolve(new Set(['CONDSTORE', 'QRESYNC', 'UTF8=ACCEPT']))
+      }) as typeof client.run
+
+      await client.enableExtensions()
+
+      expect(runCalls.length).toBe(1)
+      expect(runCalls[0].command).toBe('ENABLE')
+      expect(runCalls[0].args).toEqual([['CONDSTORE', 'QRESYNC', 'UTF8=ACCEPT']])
+    })
+
+    it('should not call ENABLE when no supported extensions are present', async () => {
+      const client = createTestClient()
+      const runCalls: { command: string; args: unknown[] }[] = []
+
+      client._capabilities = new Set(['IMAP4rev1', 'IDLE'])
+      client.run = ((command: string, ...args: unknown[]) => {
+        runCalls.push({ args, command })
+        return Promise.resolve(new Set())
+      }) as typeof client.run
+
+      await client.enableExtensions()
+
+      expect(runCalls.length).toBe(0)
+    })
+  })
+})
diff --git a/src/shell/client/index.ts b/src/shell/client/index.ts
index 6b0f168..6c65ea0 100644
--- a/src/shell/client/index.ts
+++ b/src/shell/client/index.ts
@@ -285,9 +285,32 @@ export class IMAPClient extends EventEmitter implements CommandContext, AsyncDis
     }
 
     this.stateMachine.send({ type: 'AUTHENTICATED', user })
+
+    await this.enableExtensions()
+
     return user
   }
 
+  private async enableExtensions(): Promise<void> {
+    const extensionsToEnable: string[] = []
+
+    if (this._capabilities.has('CONDSTORE')) {
+      extensionsToEnable.push('CONDSTORE')
+    }
+
+    if (this._capabilities.has('QRESYNC')) {
+      extensionsToEnable.push('QRESYNC')
+    }
+
+    if (this._capabilities.has('UTF8=ACCEPT')) {
+      extensionsToEnable.push('UTF8=ACCEPT')
+    }
+
+    if (extensionsToEnable.length > 0) {
+      await this.run('ENABLE', extensionsToEnable)
+    }
+  }
+
   async exec(
     command: string,
     attributes: readonly CommandAttribute[] = [],
diff --git a/src/shell/commands/enable.test.ts b/src/shell/commands/enable.test.ts
new file mode 100644
index 0000000..7afc851
--- /dev/null
+++ b/src/shell/commands/enable.test.ts
@@ -0,0 +1,196 @@
+import { enable } from './enable'
+import { createMockContext, createMockLoggerWithWarn, createMockResponse } from './test-utils'
+
+describe('enable command', () => {
+  describe('preconditions', () => {
+    it('should return empty set if ENABLE capability is not present', async () => {
+      const ctx = createMockContext({
+        capabilities: new Set(['IMAP4rev1', 'CONDSTORE']),
+        state: 'AUTHENTICATED',
+      })
+
+      const result = await enable(ctx, ['CONDSTORE'])
+
+      expect(result).toEqual(new Set())
+      expect(ctx.mockExecCalls.length).toBe(0)
+    })
+
+    it('should return empty set if state is not AUTHENTICATED', async () => {
+      const ctx = createMockContext({
+        capabilities: new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE']),
+        state: 'SELECTED',
+      })
+
+      const result = await enable(ctx, ['CONDSTORE'])
+
+      expect(result).toEqual(new Set())
+      expect(ctx.mockExecCalls.length).toBe(0)
+    })
+
+    it('should return empty set if no requested extensions are available', async () => {
+      const ctx = createMockContext({
+        capabilities: new Set(['IMAP4rev1', 'ENABLE']),
+        state: 'AUTHENTICATED',
+      })
+
+      const result = await enable(ctx, ['CONDSTORE', 'QRESYNC'])
+
+      expect(result).toEqual(new Set())
+      expect(ctx.mockExecCalls.length).toBe(0)
+    })
+  })
+
+  describe('success cases', () => {
+    it('should send ENABLE command with available extensions', async () => {
+      const ctx = createMockContext({
+        capabilities: new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE']),
+        state: 'AUTHENTICATED',
+      })
+
+      await enable(ctx, ['CONDSTORE'])
+
+      expect(ctx.mockExecCalls.length).toBe(1)
+      expect(ctx.mockExecCalls[0].command).toBe('ENABLE')
+      expect(ctx.mockExecCalls[0].attributes).toEqual([{ type: 'ATOM', value: 'CONDSTORE' }])
+    })
+
+    it('should filter out extensions not in capabilities', async () => {
+      const ctx = createMockContext({
+        capabilities: new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE']),
+        state: 'AUTHENTICATED',
+      })
+
+      await enable(ctx, ['CONDSTORE', 'QRESYNC', 'UTF8=ACCEPT'])
+
+      expect(ctx.mockExecCalls.length).toBe(1)
+      expect(ctx.mockExecCalls[0].attributes).toEqual([{ type: 'ATOM', value: 'CONDSTORE' }])
+    })
+
+    it('should enable multiple extensions when available', async () => {
+      const ctx = createMockContext({
+        capabilities: new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE', 'QRESYNC']),
+        state: 'AUTHENTICATED',
+      })
+
+      await enable(ctx, ['CONDSTORE', 'QRESYNC'])
+
+      expect(ctx.mockExecCalls.length).toBe(1)
+      expect(ctx.mockExecCalls[0].attributes).toEqual([
+        { type: 'ATOM', value: 'CONDSTORE' },
+        { type: 'ATOM', value: 'QRESYNC' },
+      ])
+    })
+
+    it('should uppercase extension names', async () => {
+      const ctx = createMockContext({
+        capabilities: new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE']),
+        state: 'AUTHENTICATED',
+      })
+
+      await enable(ctx, ['condstore'])
+
+      expect(ctx.mockExecCalls[0].attributes).toEqual([{ type: 'ATOM', value: 'CONDSTORE' }])
+    })
+
+    it('should parse ENABLED response and call addEnabled', async () => {
+      const enabledExtensions: string[] = []
+      const ctx = createMockContext({
+        addEnabled: (ext: string) => {
+          enabledExtensions.push(ext)
+        },
+        capabilities: new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE']),
+        state: 'AUTHENTICATED',
+      })
+
+      const enablePromise = enable(ctx, ['CONDSTORE'])
+
+      await ctx.triggerUntagged(
+        'ENABLED',
+        createMockResponse({
+          attributes: [{ type: 'ATOM', value: 'CONDSTORE' }] as never,
+          command: 'ENABLED',
+          tag: '*',
+        }),
+      )
+
+      const result = await enablePromise
+
+      expect(result).toEqual(new Set(['CONDSTORE']))
+      expect(enabledExtensions).toEqual(['CONDSTORE'])
+    })
+
+    it('should handle multiple enabled extensions in response', async () => {
+      const enabledExtensions: string[] = []
+      const ctx = createMockContext({
+        addEnabled: (ext: string) => {
+          enabledExtensions.push(ext)
+        },
+        capabilities: new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE', 'QRESYNC']),
+        state: 'AUTHENTICATED',
+      })
+
+      const enablePromise = enable(ctx, ['CONDSTORE', 'QRESYNC'])
+
+      await ctx.triggerUntagged(
+        'ENABLED',
+        createMockResponse({
+          attributes: [
+            { type: 'ATOM', value: 'CONDSTORE' },
+            { type: 'ATOM', value: 'QRESYNC' },
+          ] as never,
+          command: 'ENABLED',
+          tag: '*',
+        }),
+      )
+
+      const result = await enablePromise
+
+      expect(result).toEqual(new Set(['CONDSTORE', 'QRESYNC']))
+      expect(enabledExtensions).toEqual(['CONDSTORE', 'QRESYNC'])
+    })
+
+    it('should ignore ENABLED response with no attributes', async () => {
+      const enabledExtensions: string[] = []
+      const ctx = createMockContext({
+        addEnabled: (ext: string) => {
+          enabledExtensions.push(ext)
+        },
+        capabilities: new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE']),
+        state: 'AUTHENTICATED',
+      })
+
+      const enablePromise = enable(ctx, ['CONDSTORE'])
+
+      await ctx.triggerUntagged(
+        'ENABLED',
+        createMockResponse({
+          attributes: undefined,
+          command: 'ENABLED',
+          tag: '*',
+        }),
+      )
+
+      const result = await enablePromise
+
+      expect(result).toEqual(new Set())
+      expect(enabledExtensions).toEqual([])
+    })
+  })
+
+  describe('error cases', () => {
+    it('should return empty set and log warning on exec error', async () => {
+      const warnCalls: unknown[] = []
+      const ctx = createMockContext({
+        capabilities: new Set(['IMAP4rev1', 'ENABLE', 'CONDSTORE']),
+        exec: () => Promise.reject(new Error('Connection failed')),
+        log: createMockLoggerWithWarn(warnCalls),
+        state: 'AUTHENTICATED',
+      })
+
+      const result = await enable(ctx, ['CONDSTORE'])
+
+      expect(result).toEqual(new Set())
+      expect(warnCalls.length).toBe(1)
+    })
+  })
+})