View file contents or list directory.

For files:

• Returns content with line numbers (format: " N\t")

• Use view_range to read specific lines [start, end] (1-indexed, inclusive)

• Large files are truncated at 16000 characters

For directories:

• Lists contents with type indicator (/ for directories)

• Shows 2 levels deep by default

• Ignores hidden files and node_modules

Create or overwrite a file with the specified content.

• Creates parent directories if they don't exist

• Overwrites existing files without warning

• Use absolute paths

Replace an exact string in a file.

• old_str must match exactly and be unique in the file

• If old_str appears 0 times or more than once, the operation fails

• If new_str is omitted, old_str is deleted

• Use absolute paths

Insert text at a specific line in a file.

• insert_line = 0: Insert at the beginning

• insert_line = N: Insert after line N

• insert_line = -1: Insert at the end

• insert_text should typically end with a newline

• Use absolute paths