diff --git a/packages/plugin/handlers/commandHandlers.ts b/packages/plugin/handlers/commandHandlers.ts
index bbc28685..e924a876 100644
--- a/packages/plugin/handlers/commandHandlers.ts
+++ b/packages/plugin/handlers/commandHandlers.ts
@@ -1,13 +1,9 @@
 import { WorkspaceLeaf } from "obsidian";
 import FileOrganizer from "../index";
 import { ORGANIZER_VIEW_TYPE, AssistantViewWrapper } from "../views/assistant/view";
-import { App, TFile } from "obsidian";
-import { logger } from "../services/logger";
-
-
+import { App } from "obsidian";
 
 export function initializeOrganizer(plugin: FileOrganizer) {
-
   plugin.registerView(
     ORGANIZER_VIEW_TYPE,
     (leaf: WorkspaceLeaf) => new AssistantViewWrapper(leaf, plugin)
@@ -16,11 +12,9 @@ export function initializeOrganizer(plugin: FileOrganizer) {
   plugin.addRibbonIcon("sparkle", "Fo2k Assistant View", () => {
     plugin.ensureAssistantView();
   });
-
 }
 
 export function initializeFileOrganizationCommands(plugin: FileOrganizer) {
-
   plugin.addCommand({
     id: "add-to-inbox",
     name: "Put in inbox",
@@ -32,43 +26,3 @@ export function initializeFileOrganizationCommands(plugin: FileOrganizer) {
     },
   });
 }
-
-export async function addTextToDocument(app: App, content: string, path?: string): Promise<void> {
-  try {
-    let targetFile: TFile;
-    console.log("path", path, 'addTextToDocument');
-    
-    if (path) {
-      targetFile = app.vault.getAbstractFileByPath(path) as TFile;
-      if (!targetFile) {
-        throw new Error(`File not found at path: ${path}`);
-      }
-    } else {
-      // Get the active file
-      targetFile = app.workspace.getActiveFile();
-      if (!targetFile) {
-        throw new Error("No active file found");
-      }
-    }
-
-    // Get current content
-    const currentContent = await app.vault.read(targetFile);
-    
-    // Get editor if it exists
-    const editor = app.workspace.activeEditor?.editor;
-    
-    if (editor) {
-      // If we have an editor, insert at cursor position
-      const cursor = editor.getCursor();
-      editor.replaceRange(content, cursor);
-    } else {
-      // Otherwise append to the end
-      await app.vault.modify(targetFile, currentContent + "\n" + content);
-    }
-    
-    logger.info(`Successfully added text to document: ${targetFile.path}`);
-  } catch (error) {
-    logger.error("Error adding text to document:", error);
-    throw error;
-  }
-}
diff --git a/packages/plugin/views/assistant/ai-chat/tool-handlers/add-text-handler.tsx b/packages/plugin/views/assistant/ai-chat/tool-handlers/add-text-handler.tsx
index cdfe4e9f..c6aa08aa 100644
--- a/packages/plugin/views/assistant/ai-chat/tool-handlers/add-text-handler.tsx
+++ b/packages/plugin/views/assistant/ai-chat/tool-handlers/add-text-handler.tsx
@@ -1,6 +1,5 @@
 import React, { useRef, useState } from "react";
-import { App } from "obsidian";
-import { addTextToDocument } from "../../../../handlers/commandHandlers";
+import { App, TFile } from "obsidian";
 import { logger } from "../../../../services/logger";
 
 interface AddTextHandlerProps {
@@ -23,7 +22,37 @@ export function AddTextHandler({
         hasFetchedRef.current = true;
         const { content, path } = toolInvocation.args;
         try {
-          await addTextToDocument(app, content, path);
+          let targetFile: TFile;
+          
+          if (path) {
+            targetFile = app.vault.getAbstractFileByPath(path) as TFile;
+            if (!targetFile) {
+              throw new Error(`File not found at path: ${path}`);
+            }
+          } else {
+            // Get the active file
+            targetFile = app.workspace.getActiveFile();
+            if (!targetFile) {
+              throw new Error("No active file found");
+            }
+          }
+
+          // Get current content
+          const currentContent = await app.vault.read(targetFile);
+          
+          // Get editor if it exists
+          const editor = app.workspace.activeEditor?.editor;
+          
+          if (editor) {
+            // If we have an editor, insert at cursor position
+            const cursor = editor.getCursor();
+            editor.replaceRange(content, cursor);
+          } else {
+            // Otherwise append to the end
+            await app.vault.modify(targetFile, currentContent + "\n" + content);
+          }
+          
+          logger.info(`Successfully added text to document: ${targetFile.path}`);
           handleAddResult(`Successfully added text to document${path ? `: ${path}` : ""}`);
           setAddSuccess(true);
         } catch (error) {
diff --git a/packages/plugin/views/assistant/ai-chat/tool-handlers/modify-text-handler.tsx b/packages/plugin/views/assistant/ai-chat/tool-handlers/modify-text-handler.tsx
new file mode 100644
index 00000000..4cf5f8c8
--- /dev/null
+++ b/packages/plugin/views/assistant/ai-chat/tool-handlers/modify-text-handler.tsx
@@ -0,0 +1,81 @@
+import React, { useRef, useState } from "react";
+import { App, TFile } from "obsidian";
+import { logger } from "../../../../services/logger";
+
+interface ModifyTextHandlerProps {
+  toolInvocation: any;
+  handleAddResult: (result: string) => void;
+  app: App;
+}
+
+export function ModifyTextHandler({
+  toolInvocation,
+  handleAddResult,
+  app,
+}: ModifyTextHandlerProps) {
+  const hasFetchedRef = useRef(false);
+  const [modifySuccess, setModifySuccess] = useState<boolean | null>(null);
+
+  React.useEffect(() => {
+    const handleModifyText = async () => {
+      if (!hasFetchedRef.current && !("result" in toolInvocation)) {
+        hasFetchedRef.current = true;
+        const { content, path } = toolInvocation.args;
+        try {
+          let targetFile: TFile;
+          
+          if (path) {
+            targetFile = app.vault.getAbstractFileByPath(path) as TFile;
+            if (!targetFile) {
+              throw new Error(`File not found at path: ${path}`);
+            }
+          } else {
+            // Get the active file
+            targetFile = app.workspace.getActiveFile();
+            if (!targetFile) {
+              throw new Error("No active file found");
+            }
+          }
+          
+          // Get editor if it exists
+          const editor = app.workspace.activeEditor?.editor;
+          
+          if (editor) {
+            // If we have an editor, replace the selected text or entire content
+            const selection = editor.getSelection();
+            if (selection) {
+              // If there's selected text, replace just that
+              editor.replaceSelection(content);
+            } else {
+              // If no selection, replace entire content
+              editor.setValue(content);
+            }
+          } else {
+            // If no editor is open, modify the entire file
+            await app.vault.modify(targetFile, content);
+          }
+          
+          logger.info(`Successfully modified text in document: ${targetFile.path}`);
+          handleAddResult(`Successfully modified text in document${path ? `: ${path}` : ""}`);
+          setModifySuccess(true);
+        } catch (error) {
+          logger.error("Error modifying text in document:", error);
+          handleAddResult(`Error: ${error.message}`);
+          setModifySuccess(false);
+        }
+      }
+    };
+
+    handleModifyText();
+  }, [toolInvocation, handleAddResult, app]);
+
+  if (modifySuccess === null) {
+    return <div className="text-sm text-[--text-muted]">Modifying text in document...</div>;
+  }
+
+  if (modifySuccess) {
+    return <div className="text-sm text-[--text-muted]">Text successfully modified in document</div>;
+  }
+
+  return <div className="text-sm text-[--text-error]">Failed to modify text in document</div>;
+} 
\ No newline at end of file
diff --git a/packages/plugin/views/assistant/ai-chat/tool-handlers/tool-invocation-handler.tsx b/packages/plugin/views/assistant/ai-chat/tool-handlers/tool-invocation-handler.tsx
index 7641d83b..60122a5f 100644
--- a/packages/plugin/views/assistant/ai-chat/tool-handlers/tool-invocation-handler.tsx
+++ b/packages/plugin/views/assistant/ai-chat/tool-handlers/tool-invocation-handler.tsx
@@ -15,6 +15,7 @@ import { RenameFilesHandler } from "./rename-files-handler";
 import { SearchRenameHandler } from "./search-rename-handler";
 import { ExecuteActionsHandler } from "./execute-actions-handler";
 import { AddTextHandler } from "./add-text-handler";
+import { ModifyTextHandler } from "./modify-text-handler";
 
 interface ToolInvocationHandlerProps {
   toolInvocation: ToolInvocation;
@@ -48,6 +49,7 @@ function ToolInvocationHandler({
       searchByName: "Search Files by Name",
       executeActionsOnFileBasedOnPrompt: "Execute Actions on Files",
       addTextToDocument: "Adding Text to Document",
+      modifyDocumentText: "Modifying Document Text",
     };
     return toolTitles[toolName] || "Tool Invocation";
   };
@@ -142,6 +144,13 @@ function ToolInvocationHandler({
           app={app}
         />
       ),
+      modifyDocumentText: () => (
+        <ModifyTextHandler
+          toolInvocation={toolInvocation}
+          handleAddResult={handleAddResult}
+          app={app}
+        />
+      ),
     };
 
     return handlers[toolInvocation.toolName]?.() || null;
diff --git a/packages/web/app/api/(newai)/chat/route.ts b/packages/web/app/api/(newai)/chat/route.ts
index b94d12e9..f77ea9b1 100644
--- a/packages/web/app/api/(newai)/chat/route.ts
+++ b/packages/web/app/api/(newai)/chat/route.ts
@@ -113,6 +113,13 @@ export async function POST(req: NextRequest) {
             path: z.string().optional().describe("Optional path to the document. If not provided, uses current document"),
           }),
         },
+        modifyDocumentText: {
+          description: "Modifies the text in the current document or selected text according to user's request",
+          parameters: z.object({
+            content: z.string().describe("The new text content to replace the current content or selection"),
+            path: z.string().optional().describe("Optional path to the document. If not provided, uses current document"),
+          }),
+        },
         generateSettings: {
           description:
             "Generate vault organization settings based on user preferences",