diff --git a/src/agents/code-mode-namespaces.ts b/src/agents/code-mode-namespaces.ts
index e85593893f08..ac4da84f7757 100644
--- a/src/agents/code-mode-namespaces.ts
+++ b/src/agents/code-mode-namespaces.ts
@@ -574,6 +574,7 @@ export type CodeModeApiVirtualFile = {
   path: string;
   description?: string;
   content: string;
+  bytes: number;
 };
 
 function buildMcpParamDocs(schema: unknown): McpApiParamDoc[] {
@@ -872,18 +873,22 @@ export function createCodeModeApiVirtualFiles(
   if (!model) {
     return [];
   }
+  const rootContent = renderMcpRootFile(model.docs);
   const files: CodeModeApiVirtualFile[] = [
     {
       path: "mcp/index.d.ts",
       description: "Root MCP namespace declaration and server list.",
-      content: renderMcpRootFile(model.docs),
+      content: rootContent,
+      bytes: Buffer.byteLength(rootContent, "utf8"),
     },
   ];
   for (const server of model.docs) {
+    const content = renderMcpServerHeader(server, server.tools);
     files.push({
       path: `mcp/${server.identifier}.d.ts`,
       description: `MCP server declaration for ${server.serverName}.`,
-      content: renderMcpServerHeader(server, server.tools),
+      content,
+      bytes: Buffer.byteLength(content, "utf8"),
     });
   }
   return files;
diff --git a/src/agents/code-mode.test.ts b/src/agents/code-mode.test.ts
index 8bb71b9ca738..81edc622eb70 100644
--- a/src/agents/code-mode.test.ts
+++ b/src/agents/code-mode.test.ts
@@ -886,7 +886,7 @@ describe("Code Mode", () => {
         type: "object",
         properties: {
           owner: { type: "string" },
-          repo: { type: "string", description: "Repository name" },
+          repo: { type: "string", description: "Repository 名称" },
           title: { type: "string", description: "Issue title\nShown in tracker" },
           body: { type: "string", default: "" },
         },
@@ -939,6 +939,9 @@ describe("Code Mode", () => {
         return {
           apiHeader: api.header,
           apiFilePaths: apiFiles.files.map((file) => file.path),
+          listedServerFileBytes: apiFiles.files.find((file) => file.path === "mcp/github.d.ts").bytes,
+          serverFileBytes: serverFile.bytes,
+          serverFileContent: serverFile.content,
           rootFileHasReference: rootFile.content.includes('./github.d.ts'),
           serverFileHasCreateIssue: serverFile.content.includes('function createIssue('),
           serverFileHasTitleDoc: serverFile.content.includes('@param title Issue title Shown in tracker'),
@@ -987,12 +990,23 @@ describe("Code Mode", () => {
       apiSchemaTitle: "object",
       apiHeader: expect.stringContaining("function createIssue("),
       apiFilePaths: ["mcp/index.d.ts", "mcp/github.d.ts"],
+      listedServerFileBytes: expect.any(Number),
+      serverFileBytes: expect.any(Number),
+      serverFileContent: expect.stringContaining("Repository 名称"),
       rootFileHasReference: true,
       serverFileHasCreateIssue: true,
       serverFileHasTitleDoc: true,
       rootServers: [{ identifier: "github", serverName: "github", toolCount: 1 }],
     });
-    const value = details.value as { apiHeader: string };
+    const value = details.value as {
+      apiHeader: string;
+      listedServerFileBytes: number;
+      serverFileBytes: number;
+      serverFileContent: string;
+    };
+    expect(value.listedServerFileBytes).toBe(value.serverFileBytes);
+    expect(value.serverFileBytes).toBe(Buffer.byteLength(value.serverFileContent, "utf8"));
+    expect(value.serverFileBytes).toBeGreaterThan(value.serverFileContent.length);
     expect(value.apiHeader).toContain("@param title Issue title Shown in tracker");
     expect(value.apiHeader).not.toContain("@param title Issue title\n");
     expect(value.apiHeader).toContain("title: string;");
diff --git a/src/agents/code-mode.worker.ts b/src/agents/code-mode.worker.ts
index f1111f5f3c42..724323a5d5ce 100644
--- a/src/agents/code-mode.worker.ts
+++ b/src/agents/code-mode.worker.ts
@@ -7,6 +7,7 @@ import { createRequire } from "node:module";
 import { parentPort, workerData } from "node:worker_threads";
 import { isRecord } from "@openclaw/normalization-core/record-coerce";
 import { EvalFlags, Intrinsics, JSException, QuickJS, type JSValueHandle } from "quickjs-wasi";
+import type { CodeModeApiVirtualFile } from "./code-mode-namespaces.js";
 const require = createRequire(import.meta.url);
 const QUICKJS_WASM_PATH = require.resolve("quickjs-wasi/quickjs.wasm");
 let quickJsWasmModulePromise: Promise<WebAssembly.Module> | undefined;
@@ -46,12 +47,6 @@ type CodeModeNamespaceDescriptor = {
   scope: SerializedCodeModeNamespaceValue;
 };
 
-type CodeModeApiVirtualFile = {
-  path: string;
-  description?: string;
-  content: string;
-};
-
 type CodeModeWorkerInput =
   | {
       kind: "exec";
@@ -312,7 +307,7 @@ const CONTROLLER_SOURCE = String.raw`
       path,
       content,
       description: typeof file.description === "string" ? file.description : undefined,
-      bytes: content.length,
+      bytes: file.bytes,
     }));
   }
   const api = Object.freeze({