Function select_catalog_schema 

pub fn select_catalog_schema(
    supported: &[Value],
    capabilities: &ClientCapabilities,
    accepts_inline: bool,
) -> Result<Value>

Picks the catalog document both sides can speak.

The renderer’s order is the preference order. When it supplies inline catalogs and accepts_inline is set, their components are merged into the selection — keeping the selected catalog’s catalogId, because that id is what the two sides negotiated on and what createSurface will carry.

Errors

Returns Error::Catalog when the renderer supports none of the agent’s catalogs, when it offers inline catalogs the agent does not accept, or when the agent has no catalogs at all.