diff --git a/packages/a2a-server/src/agent/executor.ts b/packages/a2a-server/src/agent/executor.ts
index e2287a2562..7fc35657fb 100644
--- a/packages/a2a-server/src/agent/executor.ts
+++ b/packages/a2a-server/src/agent/executor.ts
@@ -12,23 +12,22 @@ import type {
   RequestContext,
   ExecutionEventBus,
 } from '@a2a-js/sdk/server';
-import type { ToolCallRequestInfo, Config } from '@google/gemini-cli-core';
 import {
   GeminiEventType,
   SimpleExtensionLoader,
+  type ToolCallRequestInfo,
+  type Config,
 } from '@google/gemini-cli-core';
 import { v4 as uuidv4 } from 'uuid';
 
 import { logger } from '../utils/logger.js';
-import type {
-  StateChange,
-  AgentSettings,
-  PersistedStateMetadata,
-} from '../types.js';
 import {
   CoderAgentEvent,
   getPersistedState,
   setPersistedState,
+  type StateChange,
+  type AgentSettings,
+  type PersistedStateMetadata,
   getContextIdFromMetadata,
   getAgentSettingsFromMetadata,
 } from '../types.js';
diff --git a/packages/a2a-server/src/agent/task.test.ts b/packages/a2a-server/src/agent/task.test.ts
index 81987a780b..e29f669333 100644
--- a/packages/a2a-server/src/agent/task.test.ts
+++ b/packages/a2a-server/src/agent/task.test.ts
@@ -14,17 +14,15 @@ import {
   type Mock,
 } from 'vitest';
 import { Task } from './task.js';
-import type {
-  ToolCall,
-  Config,
-  ToolCallRequestInfo,
-  GitService,
-  CompletedToolCall,
-} from '@google/gemini-cli-core';
 import {
   GeminiEventType,
   ApprovalMode,
   ToolConfirmationOutcome,
+  type Config,
+  type ToolCallRequestInfo,
+  type GitService,
+  type CompletedToolCall,
+  type ToolCall,
 } from '@google/gemini-cli-core';
 import { createMockConfig } from '../utils/testing_utils.js';
 import type { ExecutionEventBus, RequestContext } from '@a2a-js/sdk/server';
diff --git a/packages/a2a-server/src/agent/task.ts b/packages/a2a-server/src/agent/task.ts
index c91ef72781..1defbdd36c 100644
--- a/packages/a2a-server/src/agent/task.ts
+++ b/packages/a2a-server/src/agent/task.ts
@@ -31,7 +31,10 @@ import {
   EDIT_TOOL_NAMES,
   processRestorableToolCalls,
 } from '@google/gemini-cli-core';
-import type { RequestContext, ExecutionEventBus } from '@a2a-js/sdk/server';
+import {
+  type ExecutionEventBus,
+  type RequestContext,
+} from '@a2a-js/sdk/server';
 import type {
   TaskStatusUpdateEvent,
   TaskArtifactUpdateEvent,
@@ -44,16 +47,16 @@ import { v4 as uuidv4 } from 'uuid';
 import { logger } from '../utils/logger.js';
 import * as fs from 'node:fs/promises';
 import * as path from 'node:path';
-import { CoderAgentEvent } from '../types.js';
-import type {
-  CoderAgentMessage,
-  StateChange,
-  ToolCallUpdate,
-  TextContent,
-  TaskMetadata,
-  Thought,
-  ThoughtSummary,
-  Citation,
+import {
+  CoderAgentEvent,
+  type CoderAgentMessage,
+  type StateChange,
+  type ToolCallUpdate,
+  type TextContent,
+  type TaskMetadata,
+  type Thought,
+  type ThoughtSummary,
+  type Citation,
 } from '../types.js';
 import type { PartUnion, Part as genAiPart } from '@google/genai';
 
diff --git a/packages/a2a-server/src/commands/init.test.ts b/packages/a2a-server/src/commands/init.test.ts
index df2a213cba..b7020e0729 100644
--- a/packages/a2a-server/src/commands/init.test.ts
+++ b/packages/a2a-server/src/commands/init.test.ts
@@ -6,7 +6,11 @@
 
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { InitCommand } from './init.js';
-import { performInit } from '@google/gemini-cli-core';
+import {
+  performInit,
+  type CommandActionReturn,
+  type Config,
+} from '@google/gemini-cli-core';
 import * as fs from 'node:fs';
 import * as path from 'node:path';
 import { CoderAgentExecutor } from '../agent/executor.js';
@@ -14,7 +18,6 @@ import { CoderAgentEvent } from '../types.js';
 import type { ExecutionEventBus } from '@a2a-js/sdk/server';
 import { createMockConfig } from '../utils/testing_utils.js';
 import type { CommandContext } from './types.js';
-import type { CommandActionReturn, Config } from '@google/gemini-cli-core';
 import { logger } from '../utils/logger.js';
 
 vi.mock('@google/gemini-cli-core', async (importOriginal) => {
diff --git a/packages/a2a-server/src/commands/memory.test.ts b/packages/a2a-server/src/commands/memory.test.ts
index 40c5d1b90b..975b517c78 100644
--- a/packages/a2a-server/src/commands/memory.test.ts
+++ b/packages/a2a-server/src/commands/memory.test.ts
@@ -9,6 +9,9 @@ import {
   listMemoryFiles,
   refreshMemory,
   showMemory,
+  type AnyDeclarativeTool,
+  type Config,
+  type ToolRegistry,
 } from '@google/gemini-cli-core';
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 import {
@@ -19,11 +22,6 @@ import {
   ShowMemoryCommand,
 } from './memory.js';
 import type { CommandContext } from './types.js';
-import type {
-  AnyDeclarativeTool,
-  Config,
-  ToolRegistry,
-} from '@google/gemini-cli-core';
 
 // Mock the core functions
 vi.mock('@google/gemini-cli-core', async (importOriginal) => {
diff --git a/packages/a2a-server/src/config/config.ts b/packages/a2a-server/src/config/config.ts
index 6a27bca4d5..0873f43d98 100644
--- a/packages/a2a-server/src/config/config.ts
+++ b/packages/a2a-server/src/config/config.ts
@@ -8,11 +8,6 @@ import * as fs from 'node:fs';
 import * as path from 'node:path';
 import * as dotenv from 'dotenv';
 
-import type {
-  TelemetryTarget,
-  ConfigParameters,
-  ExtensionLoader,
-} from '@google/gemini-cli-core';
 import {
   AuthType,
   Config,
@@ -28,6 +23,9 @@ import {
   fetchAdminControlsOnce,
   getCodeAssistServer,
   ExperimentFlags,
+  type TelemetryTarget,
+  type ConfigParameters,
+  type ExtensionLoader,
 } from '@google/gemini-cli-core';
 
 import { logger } from '../utils/logger.js';
diff --git a/packages/a2a-server/src/http/app.test.ts b/packages/a2a-server/src/http/app.test.ts
index c863fb1472..7262be42a8 100644
--- a/packages/a2a-server/src/http/app.test.ts
+++ b/packages/a2a-server/src/http/app.test.ts
@@ -4,11 +4,12 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import type {
-  Config,
-  ToolCallConfirmationDetails,
+import {
+  GeminiEventType,
+  ApprovalMode,
+  type Config,
+  type ToolCallConfirmationDetails,
 } from '@google/gemini-cli-core';
-import { GeminiEventType, ApprovalMode } from '@google/gemini-cli-core';
 import type {
   TaskStatusUpdateEvent,
   SendStreamingMessageSuccessResponse,
diff --git a/packages/a2a-server/src/persistence/gcs.test.ts b/packages/a2a-server/src/persistence/gcs.test.ts
index 43563448e5..353a8312d5 100644
--- a/packages/a2a-server/src/persistence/gcs.test.ts
+++ b/packages/a2a-server/src/persistence/gcs.test.ts
@@ -11,8 +11,16 @@ import { gzipSync, gunzipSync } from 'node:zlib';
 import { v4 as uuidv4 } from 'uuid';
 import type { Task as SDKTask } from '@a2a-js/sdk';
 import type { TaskStore } from '@a2a-js/sdk/server';
-import type { Mocked, MockedClass, Mock } from 'vitest';
-import { describe, it, expect, beforeEach, vi } from 'vitest';
+import {
+  describe,
+  it,
+  expect,
+  beforeEach,
+  vi,
+  type Mocked,
+  type MockedClass,
+  type Mock,
+} from 'vitest';
 
 import { GCSTaskStore, NoOpTaskStore } from './gcs.js';
 import { logger } from '../utils/logger.js';
diff --git a/packages/a2a-server/src/utils/executor_utils.ts b/packages/a2a-server/src/utils/executor_utils.ts
index b595a6905b..cf635f8822 100644
--- a/packages/a2a-server/src/utils/executor_utils.ts
+++ b/packages/a2a-server/src/utils/executor_utils.ts
@@ -8,8 +8,7 @@ import type { Message } from '@a2a-js/sdk';
 import type { ExecutionEventBus } from '@a2a-js/sdk/server';
 import { v4 as uuidv4 } from 'uuid';
 
-import { CoderAgentEvent } from '../types.js';
-import type { StateChange } from '../types.js';
+import { CoderAgentEvent, type StateChange } from '../types.js';
 
 export async function pushTaskStateFailed(
   error: unknown,
diff --git a/packages/a2a-server/src/utils/testing_utils.ts b/packages/a2a-server/src/utils/testing_utils.ts
index 9cb0657c7a..977daedf16 100644
--- a/packages/a2a-server/src/utils/testing_utils.ts
+++ b/packages/a2a-server/src/utils/testing_utils.ts
@@ -18,9 +18,10 @@ import {
   HookSystem,
   PolicyDecision,
   tmpdir,
+  type Config,
+  type Storage,
 } from '@google/gemini-cli-core';
 import { createMockMessageBus } from '@google/gemini-cli-core/src/test-utils/mock-message-bus.js';
-import type { Config, Storage } from '@google/gemini-cli-core';
 import { expect, vi } from 'vitest';
 
 export function createMockConfig(
diff --git a/packages/core/src/utils/envExpansion.ts b/packages/core/src/utils/envExpansion.ts
index 938d439ac5..c17d91e1f7 100644
--- a/packages/core/src/utils/envExpansion.ts
+++ b/packages/core/src/utils/envExpansion.ts
@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { expand } from 'dotenv-expand';
+import { expand, type DotenvExpandOutput } from 'dotenv-expand';
 
 /**
  * Expands environment variables in a string using the provided environment record.
@@ -45,7 +45,7 @@ export function expandEnvVars(
     }
   }
 
-  const result = expand({
+  const result: DotenvExpandOutput = expand({
     parsed: { [dummyKey]: processedStr },
     processEnv,
   });