The identity of one registered router component shown to an authorization policy.
name is the registered component name, which the router keeps unique within
each catalog. uri carries the exact registered resource URI or resource URI
template and is nil for tools and prompts. requested_uri carries the
concrete URI for a resource-template read or subscription read check. It is
nil during discovery and template completion, where no concrete resource
URI was requested. A policy may key on these fields; new fields are additive,
so match with a map pattern rather than positionally.