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src/tools/read-file.js

@@ -124,7 +124,9 @@ export function createReadFileTool({ googleAuthId }) {
                     `"${clean}" is a binary file (${raw.length} bytes${ext ? `, ${ext}` : ''}) and cannot be read as text. ` +
                     (['.png', '.jpg', '.jpeg', '.avif', '.webp', '.gif', '.bmp'].includes(ext)
                         ? 'Use analyze_image({ path: ' + JSON.stringify(clean) + ' }) to have a vision model inspect it.'
-                        : 'Fetch it as bytes from javascript_execute with fs.readFileSync if you need its contents.')
+                        : (['.xlsx', '.xls', '.xlsm'].includes(ext)
+                            ? 'Use javascript_execute with ExcelJS to inspect or modify spreadsheet files.'
+                            : 'Fetch it as bytes from javascript_execute with fs.readFileSync if you need its contents.'))
                 );
             }