Command

Mutating atoms. WRITE effect. Sub-shape: ScalarCommand. Commands yield nothing.

Core only - shapes and ext/ not included.

IO

User-facing commands that write to stdio. All declare own_effects = {0: WRITE} on the StdioRef position.

Name	Sub-shape	Signature	Effect	Meaning
Print	ScalarCommand	`Print(*values)`	WRITE	print messages to stdout
Log	ScalarCommand	`Log(message, *values, level, logger_name)`	WRITE	structured logging at given level
Debug	ScalarCommand	`Debug(*values, labels, prefix)`	WRITE	quick debug output for development

Lower-level stdio Commands operating on a StdioRef directly. Print, Log, Debug are sugar over these.

Name	Sub-shape	Signature	Effect	Meaning
StdioWrite	ScalarCommand	`StdioWrite(ref, *values)`	WRITE	write values to a stdio stream
StdioFlush	ScalarCommand	`StdioFlush(ref)`	WRITE	flush a stdio stream's buffer

StdioRead is a ScalarQuery (lives in queries surface). BufferedStdio is a Bracket Span (lives in spans surface).