The four list-fetching state managers fired their list RPC against every
server on connect regardless of advertised capabilities, so a server that
doesn't implement a given primitive replied -32601 "Method not found",
surfacing in the console on every connect. Mirrors the `tasks`-capability
gate added for ManagedRequestorTasksState in #1349.
- managedToolsState → gate on capabilities.tools
- managedPromptsState → gate on capabilities.prompts
- managedResourcesState → gate on capabilities.resources
- managedResourceTemplatesState → gate on capabilities.resources
(the spec defines no separate resourceTemplates capability;
resources/templates/list is part of the resources surface)
When the capability is absent each manager sets an empty list, dispatches
its change event, and returns — the right semantics for "this server
doesn't support X."
Tests: existing flow tests now construct their FakeInspectorClient with
the relevant capability so the live list path is still exercised; added a
"refresh skips listX when capability absent" and a "connect against an
X-less server doesn't fire listX" test per manager. Updated the
useManagedX peers and resourceSubscriptionsState (which drives a
ManagedResourcesState refresh) to advertise the capability too.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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