Read

Retrieves file contents from the filesystem.

Runtime Comparison

Aspect	Claude Code	Opencode
Tool name	Read	read
Path parameter	file_path (absolute)	file_path (relative or absolute)
Line limits	offset, limit for pagination	offset, limit for pagination
Binary files	Images rendered visually	Returns error
PDF support	Yes	No
Jupyter support	Yes (.ipynb)	No

Both runtimes require reading a file before editing it. This catches cases where the file changed since the conversation started.