diff --git a/README.md b/README.md
index 208e614..5219c27 100644
--- a/README.md
+++ b/README.md
@@ -156,6 +156,7 @@ flowchart TD
 | ------------ | --------------------------------------------------------- |
 | `readFile`   | Reads the contents of a file from disk                    |
 | `writeFile`  | Writes or overwrites a file on disk                       |
+| `appendFile` | Appends content to a file on disk.                        |
 | `deleteFile` | Deletes a file from disk                                  |
 | `listDir`    | Lists all files in a directory                            |
 | `fetchURL`   | Fetches the content of a URL and returns it as plain text |
diff --git a/src/agent.js b/src/agent.js
index 2532969..d1f43dd 100644
--- a/src/agent.js
+++ b/src/agent.js
@@ -29,6 +29,7 @@ const SYSTEM_PROMPT = `
   TOOL {"name":"listDir","args":{"path":"."}}-{"Reason":"user wants folder content."}
   TOOL {"name":"readFile","args":{"path":"package.json"}}-{"Reason":"user wants file conetnt."}
   TOOL {"name":"writeFile","args":{"path":"test.txt","content":"hello"}}-{"Reason":"user want to write in teh file."}
+  TOOL {"name":"appendFile","args":{"path":"test.txt","content":"hello"}}-{"Reason":"user wants to append content to the file."}
   TOOL {"name":"deleteFile","args":{"path":"test.txt"}}-{"Reason":"user wants to delete the file."}
   TOOL {"name":"fetchURL","args":{"url":"https://example.com"}}-{"Reason":"user asks about website content."}
   TOOL {"name":"runCommand","args":{"command":"git status"}}-{"Reason":"user wants to inspect the repository state."}
diff --git a/src/functions.js b/src/functions.js
index bba63ef..8b1fc64 100644
--- a/src/functions.js
+++ b/src/functions.js
@@ -47,6 +47,23 @@ function writeFile(path, content) {
   }
 }
 
+function appendFile(path, content) {
+  try {
+    fs.appendFileSync(path, content, "utf8");
+    return "Content appended successfully to the file";
+  } catch (error) {
+    if (error.code === "EISDIR") {
+      return `"${path}" is a directory, not a file.`;
+    }
+
+    if (error.code === "ENOENT") {
+      return `Content could not be appended to file "${path}" because its directory does not exist.`;
+    }
+
+    throw error;
+  }
+}
+
 function deleteFile(path) {
   try {
     fs.unlinkSync(path);
@@ -136,11 +153,4 @@ function runCommand(command) {
   }
 }
 
-module.exports = {
-  readFile,
-  writeFile,
-  deleteFile,
-  listDir,
-  fetchURL,
-  runCommand,
-};
+module.exports = { readFile, writeFile, appendFile, deleteFile, listDir, fetchURL, runCommand };
diff --git a/src/tools.js b/src/tools.js
index 7c5b812..64bb54e 100644
--- a/src/tools.js
+++ b/src/tools.js
@@ -26,6 +26,20 @@ const tools = {
     },
     func: funcs.writeFile,
   },
+  appendFile: {
+  description: "Appends content to the end of an existing file on the disk.",
+  parameters: {
+    path: {
+      type: "STRING",
+      description: "The path of the file in the disk, e.g. ~/home/resume.txt",
+    },
+    content: {
+      type: "STRING",
+      description: "The content to append to the file, e.g. Hello, World!",
+    },
+  },
+  func: funcs.appendFile,
+},
   deleteFile: {
     description: "Deletes a file from the disk.",
     parameters: {