3 files changed, 87 insertions, 9 deletions

diff --git a/packages/core/src/tools/read-many-files.test.ts b/packages/core/src/tools/read-many-files.test.ts
index 666c484c..697b7d1b 100644
--- a/packages/core/src/tools/read-many-files.test.ts
+++ b/packages/core/src/tools/read-many-files.test.ts
@@ -14,6 +14,33 @@ import fs from 'fs'; // Actual fs for setup
 import os from 'os';
 import { Config } from '../config/config.js';
 
+vi.mock('mime-types', () => {
+  const lookup = (filename: string) => {
+    if (filename.endsWith('.ts') || filename.endsWith('.js')) {
+      return 'text/plain';
+    }
+    if (filename.endsWith('.png')) {
+      return 'image/png';
+    }
+    if (filename.endsWith('.pdf')) {
+      return 'application/pdf';
+    }
+    if (filename.endsWith('.mp3') || filename.endsWith('.wav')) {
+      return 'audio/mpeg';
+    }
+    if (filename.endsWith('.mp4') || filename.endsWith('.mov')) {
+      return 'video/mp4';
+    }
+    return false;
+  };
+  return {
+    default: {
+      lookup,
+    },
+    lookup,
+  };
+});
+
 describe('ReadManyFilesTool', () => {
   let tool: ReadManyFilesTool;
   let tempRootDir: string;
diff --git a/packages/core/src/utils/fileUtils.test.ts b/packages/core/src/utils/fileUtils.test.ts
index 4f4c7c1e..0455b6e1 100644
--- a/packages/core/src/utils/fileUtils.test.ts
+++ b/packages/core/src/utils/fileUtils.test.ts
@@ -211,6 +211,16 @@ describe('fileUtils', () => {
       expect(detectFileType('file.pdf')).toBe('pdf');
     });
 
+    it('should detect audio type by extension', () => {
+      mockMimeLookup.mockReturnValueOnce('audio/mpeg');
+      expect(detectFileType('song.mp3')).toBe('audio');
+    });
+
+    it('should detect video type by extension', () => {
+      mockMimeLookup.mockReturnValueOnce('video/mp4');
+      expect(detectFileType('movie.mp4')).toBe('video');
+    });
+
     it('should detect known binary extensions as binary (e.g. .zip)', () => {
       mockMimeLookup.mockReturnValueOnce('application/zip');
       expect(detectFileType('archive.zip')).toBe('binary');
@@ -427,5 +437,23 @@ describe('fileUtils', () => {
       );
       expect(result.isTruncated).toBe(true);
     });
+
+    it('should return an error if the file size exceeds 20MB', async () => {
+      // Create a file just over 20MB
+      const twentyOneMB = 21 * 1024 * 1024;
+      const buffer = Buffer.alloc(twentyOneMB, 0x61); // Fill with 'a'
+      actualNodeFs.writeFileSync(testTextFilePath, buffer);
+
+      const result = await processSingleFileContent(
+        testTextFilePath,
+        tempRootDir,
+      );
+
+      expect(result.error).toContain('File size exceeds the 20MB limit');
+      expect(result.returnDisplay).toContain(
+        'File size exceeds the 20MB limit',
+      );
+      expect(result.llmContent).toContain('File size exceeds the 20MB limit');
+    });
   });
 });
diff --git a/packages/core/src/utils/fileUtils.ts b/packages/core/src/utils/fileUtils.ts
index cb4d333a..5a05d513 100644
--- a/packages/core/src/utils/fileUtils.ts
+++ b/packages/core/src/utils/fileUtils.ts
@@ -94,19 +94,27 @@ export function isBinaryFile(filePath: string): boolean {
 /**
  * Detects the type of file based on extension and content.
  * @param filePath Path to the file.
- * @returns 'text', 'image', 'pdf', or 'binary'.
+ * @returns 'text', 'image', 'pdf', 'audio', 'video', or 'binary'.
  */
 export function detectFileType(
   filePath: string,
-): 'text' | 'image' | 'pdf' | 'binary' {
+): 'text' | 'image' | 'pdf' | 'audio' | 'video' | 'binary' {
   const ext = path.extname(filePath).toLowerCase();
   const lookedUpMimeType = mime.lookup(filePath); // Returns false if not found, or the mime type string
 
-  if (lookedUpMimeType && lookedUpMimeType.startsWith('image/')) {
-    return 'image';
-  }
-  if (lookedUpMimeType && lookedUpMimeType === 'application/pdf') {
-    return 'pdf';
+  if (lookedUpMimeType) {
+    if (lookedUpMimeType.startsWith('image/')) {
+      return 'image';
+    }
+    if (lookedUpMimeType.startsWith('audio/')) {
+      return 'audio';
+    }
+    if (lookedUpMimeType.startsWith('video/')) {
+      return 'video';
+    }
+    if (lookedUpMimeType === 'application/pdf') {
+      return 'pdf';
+    }
   }
 
   // Stricter binary check for common non-text extensions before content check
@@ -187,7 +195,7 @@ export async function processSingleFileContent(
         error: `File not found: ${filePath}`,
       };
     }
-    const stats = fs.statSync(filePath); // Sync check
+    const stats = await fs.promises.stat(filePath);
     if (stats.isDirectory()) {
       return {
         llmContent: '',
@@ -196,6 +204,19 @@ export async function processSingleFileContent(
       };
     }
 
+    const fileSizeInBytes = stats.size;
+    // 20MB limit
+    const maxFileSize = 20 * 1024 * 1024;
+
+    if (fileSizeInBytes > maxFileSize) {
+      throw new Error(
+        `File size exceeds the 20MB limit: ${filePath} (${(
+          fileSizeInBytes /
+          (1024 * 1024)
+        ).toFixed(2)}MB)`,
+      );
+    }
+
     const fileType = detectFileType(filePath);
     const relativePathForDisplay = path
       .relative(rootDirectory, filePath)
@@ -253,7 +274,9 @@ export async function processSingleFileContent(
         };
       }
       case 'image':
-      case 'pdf': {
+      case 'pdf':
+      case 'audio':
+      case 'video': {
         const contentBuffer = await fs.promises.readFile(filePath);
         const base64Data = contentBuffer.toString('base64');
         return {