Write

Creates new files or completely replaces existing file contents.

Runtime Comparison

Aspect	Claude Code	Opencode
Tool name	Write	write
Path parameter	file_path (absolute)	file_path (relative or absolute)
Overwrites existing	Yes	Yes
Creates directories	No (parent must exist)	Yes (creates parent directories)
Pre-read requirement	Yes (for existing files)	No

Write is atomic. If something fails mid-write, you won't get a half-written file.

Use Write for new files and complete replacements; use Edit for targeted modifications.