append-text-to-file

name	append-text-to-file
description	Append or add new text content to an existing file. Use this skill when the user asks to update a file, add content, append text, add a verse, add a section, or extend a document with additional material. Supports any text-based file format including .txt, .md, .py, .json, and more.

Append Text To File

Input Parameters

Parameter	Required	Description	Example
file_path	Yes	Path to the file to update	~/Downloads/poem.txt
new_content	Yes	The text content to append to the file	And as the algorithms learn and grow,
Through neural networks, row by row,
We stand together, human and machine,
Building worlds we've never seen.
preserve_formatting	No	Whether to maintain existing line breaks and spacing	true

Procedure

1. Locate the target file using find command or ask user for file path if not provided
2. Retrieve the current file content to understand context and formatting
3. Prepare the new content to append, ensuring it matches the existing style and format
4. Append the new content to the file using write_file tool with the combined original + new content
5. Verify the file was updated by checking file size and displaying the appended section
6. Confirm success with user, showing what was added

Output

Updated file with appended content. Returns confirmation message with file size change (bytes before/after) and preview of the newly added text.

Reference Commands

cat {{FILE_PATH}} && echo '{{NEW_CONTENT}}' >> {{FILE_PATH}}

Example

add another verse to the poem file
append a new section to the document
update the file with additional content
add a closing paragraph to the text file
extend the story with one more chapter

Notes

• Always retrieve and display the current file content before appending to understand context
• Ensure new content matches the existing formatting, style, and tone
• Use write_file tool rather than shell append (>>) for reliable file handling
• Consider asking user for clarification on placement if file has multiple sections