feat: add truncation logic for visible text and HTML content responses

Author: kartmcad

src/tools/browser/visiblePage.ts

@@ -50,7 +50,15 @@ export class VisibleTextTool extends BrowserToolBase {
           }
           return text.trim();
         });
-        return createSuccessResponse(`Visible text content:\n${visibleText}`);
+        // Truncate logic
+        const maxLength = typeof args.maxLength === 'number' ? args.maxLength : 20000;
+        let output = visibleText;
+        let truncated = false;
+        if (output.length > maxLength) {
+          output = output.slice(0, maxLength) + '\n[Output truncated due to size limits]';
+          truncated = true;
+        }
+        return createSuccessResponse(`Visible text content:\n${output}`);
       } catch (error) {
         return createErrorResponse(`Failed to get visible text content: ${(error as Error).message}`);
       }
@@ -170,7 +178,13 @@ export class VisibleHtmlTool extends BrowserToolBase {
           );
         }
 
-        return createSuccessResponse(`HTML content:\n${htmlContent}`);
+        // Truncate logic
+        const maxLength = typeof args.maxLength === 'number' ? args.maxLength : 20000;
+        let output = htmlContent;
+        if (output.length > maxLength) {
+          output = output.slice(0, maxLength) + '\n<!-- Output truncated due to size limits -->';
+        }
+        return createSuccessResponse(`HTML content:\n${output}`);
       } catch (error) {
         return createErrorResponse(`Failed to get visible HTML content: ${(error as Error).message}`);
       }