I/O capability reference

Runtime registration uses the type names below. custom is available only when the runtime policy permits an approved class alias or import path.

Sources

Type	Implementation	Data and attributes	Slice reads	Extra
hdf	HDFSource	Yes	Yes	Base
csv	CSVSource	Yes	Yes	Base
yaml	YAMLSource	Yes	Yes for array values	Base
buffer	BufferSource	Yes	Yes	Server-managed memory
tiled	TiledSource	Yes	Yes	tiled extra

Sinks

Type	Implementation	Complete writes	Chunk lifecycle	Extra
csv	CSVSink	Yes	No	Base
hdf, hdf_processing	HDFProcessingSink	Yes	No	Base
hdf_chunked	HDFChunkedProcessingSink	No	Yes	Server workflows
buffer	BufferSink	Yes	No	Server-managed memory
tiled	TiledSink	Yes	No	tiled extra
plotly, plotly_json, visualization	PlotlyJSONSink	Plot payload	No	plotting plus server buffer store

The base IoSource exposes data, shape, dtype, attributes, and static metadata. Unsupported capabilities return the documented neutral value or raise the explicit capability error. The base IoSink rejects chunk operations unless the implementation advertises supports_chunked_writes.

See Sources, Sinks, and the I/O extension guide.