diff --git a/src/renderer/src/aiCore/chunk/handleToolCallChunk.ts b/src/renderer/src/aiCore/chunk/handleToolCallChunk.ts
index 32c7e534e3..b5acbb690b 100644
--- a/src/renderer/src/aiCore/chunk/handleToolCallChunk.ts
+++ b/src/renderer/src/aiCore/chunk/handleToolCallChunk.ts
@@ -212,8 +212,9 @@ export class ToolCallChunkHandler {
         description: toolName,
         type: 'builtin'
       } as BaseTool
-    } else if ((mcpTool = this.mcpTools.find((t) => t.name === toolName) as MCPTool)) {
+    } else if ((mcpTool = this.mcpTools.find((t) => t.id === toolName) as MCPTool)) {
       // 如果是客户端执行的 MCP 工具，沿用现有逻辑
+      // toolName is mcpTool.id (registered with id as key in convertMcpToolsToAiSdkTools)
       logger.info(`[ToolCallChunkHandler] Handling client-side MCP tool: ${toolName}`)
       // mcpTool = this.mcpTools.find((t) => t.name === toolName) as MCPTool
       // if (!mcpTool) {
diff --git a/src/renderer/src/utils/mcp-tools.ts b/src/renderer/src/utils/mcp-tools.ts
index 49628628d4..364b22e651 100644
--- a/src/renderer/src/utils/mcp-tools.ts
+++ b/src/renderer/src/utils/mcp-tools.ts
@@ -90,7 +90,8 @@ export function openAIToolsToMcpTool(
     return undefined
   }
   const tools = mcpTools.filter((mcpTool) => {
-    return mcpTool.id === toolName || mcpTool.name === toolName
+    // toolName is mcpTool.id (registered with id as function name)
+    return mcpTool.id === toolName
   })
   if (tools.length > 1) {
     logger.warn(`Multiple MCP Tools found for tool call: ${toolName}`)