OutOfProcessReferenceResolver.ResponseV2.identifierAndCapabilities(_:_:)

The initial identifier-and-capabilities message.

case identifierAndCapabilities(DocumentationBundle.Identifier, OutOfProcessReferenceResolver.Capabilities)

Discussion

Your external link resolver should send this message, exactly once, after it has launched to signal that its ready to receive requests.

The capabilities that your external link resolver declares in this message determines which optional request messages that DocC will send. If your resolver doesn’t declare any capabilities it only needs to handle the 3 default requests. See RequestV2.