diff --git a/packages/aiCore/src/__tests__/helpers/model-test-utils.ts b/packages/aiCore/src/__tests__/helpers/model-test-utils.ts
index 067d93e8c6..b94a73efa0 100644
--- a/packages/aiCore/src/__tests__/helpers/model-test-utils.ts
+++ b/packages/aiCore/src/__tests__/helpers/model-test-utils.ts
@@ -16,9 +16,9 @@ import { MockLanguageModelV3 } from 'ai/test'
 import { vi } from 'vitest'
 import * as z from 'zod'
 
-import { StreamTextParams, StreamTextResult } from '../../core/plugins'
+import type { StreamTextParams, StreamTextResult } from '../../core/plugins'
 import type { ProviderId } from '../../core/providers/types'
-import { AiRequestContext } from '../../types'
+import type { AiRequestContext } from '../../types'
 
 /**
  * Type for partial overrides that allows omitting the model field
diff --git a/packages/aiCore/src/core/plugins/built-in/toolUsePlugin/promptToolUsePlugin.ts b/packages/aiCore/src/core/plugins/built-in/toolUsePlugin/promptToolUsePlugin.ts
index d20b501ab7..85781c428d 100644
--- a/packages/aiCore/src/core/plugins/built-in/toolUsePlugin/promptToolUsePlugin.ts
+++ b/packages/aiCore/src/core/plugins/built-in/toolUsePlugin/promptToolUsePlugin.ts
@@ -288,16 +288,11 @@ export const createPromptToolUsePlugin = (
       // 构建系统提示符（只包含非 provider 工具）
       const userSystemPrompt = typeof params.system === 'string' ? params.system : ''
       const systemPrompt = buildSystemPrompt(userSystemPrompt, promptTools)
-      let systemMessage: string | null = systemPrompt
-      if (config.createSystemMessage) {
-        // 🎯 如果用户提供了自定义处理函数，使用它
-        systemMessage = config.createSystemMessage(systemPrompt, params, context)
-      }
 
       // 保留 provide tools，移除其他 tools
       const transformedParams = {
         ...params,
-        ...(systemMessage ? { system: systemMessage } : {}),
+        ...(systemPrompt ? { system: systemPrompt } : {}),
         tools: Object.keys(providerDefinedTools).length > 0 ? providerDefinedTools : undefined
       }
       context.originalParams = transformedParams
diff --git a/packages/aiCore/src/core/plugins/built-in/toolUsePlugin/type.ts b/packages/aiCore/src/core/plugins/built-in/toolUsePlugin/type.ts
index 4937b25601..dadad8c508 100644
--- a/packages/aiCore/src/core/plugins/built-in/toolUsePlugin/type.ts
+++ b/packages/aiCore/src/core/plugins/built-in/toolUsePlugin/type.ts
@@ -22,7 +22,6 @@ export interface PromptToolUseConfig extends BaseToolUsePluginConfig {
   buildSystemPrompt?: (userSystemPrompt: string, tools: ToolSet) => string
   // 自定义工具解析函数（可选，有默认实现）
   parseToolUse?: (content: string, tools: ToolSet) => { results: ToolUseResult[]; content: string }
-  createSystemMessage?: (systemPrompt: string, originalParams: any, context: AiRequestContext) => string | null
 }
 
 /**
diff --git a/src/renderer/src/aiCore/plugins/PluginBuilder.ts b/src/renderer/src/aiCore/plugins/PluginBuilder.ts
index ca5e879ce8..d154109f4e 100644
--- a/src/renderer/src/aiCore/plugins/PluginBuilder.ts
+++ b/src/renderer/src/aiCore/plugins/PluginBuilder.ts
@@ -28,7 +28,7 @@ const logger = loggerService.withContext('PluginBuilder')
 export function buildPlugins(
   middlewareConfig: AiSdkMiddlewareConfig & { assistant: Assistant; topicId?: string }
 ): AiPlugin[] {
-  const plugins: AiPlugin[] = []
+  const plugins: AiPlugin<any, any>[] = []
 
   if (middlewareConfig.topicId && getEnableDeveloperMode()) {
     // 0. 添加 telemetry 插件
@@ -58,7 +58,7 @@ export function buildPlugins(
   }
 
   // 0.3 OpenRouter reasoning redaction
-  if (middlewareConfig.provider?.id === SystemProviderIds.openrouter && middlewareConfig.enableReasoning) {
+  if (middlewareConfig.provider?.id === SystemProviderIds.openrouter) {
     plugins.push(createOpenrouterReasoningPlugin())
   }
 
@@ -112,24 +112,7 @@ export function buildPlugins(
   if (middlewareConfig.isPromptToolUse) {
     plugins.push(
       createPromptToolUsePlugin({
-        enabled: true,
-        createSystemMessage: (systemPrompt, params, context) => {
-          const modelId = typeof context.model === 'string' ? context.model : context.model.modelId
-          if (modelId.includes('o1-mini') || modelId.includes('o1-preview')) {
-            if (context.isRecursiveCall) {
-              return null
-            }
-            params.messages = [
-              {
-                role: 'assistant',
-                content: systemPrompt
-              },
-              ...params.messages
-            ]
-            return null
-          }
-          return systemPrompt
-        }
+        enabled: true
       })
     )
   }