You'll notice
Useful2 Signal2
A page asking for an unavailable MCP server now gets one of three specific rejections.
What's wrong with this entry?
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What
The single "reserved server name" rejection has been split into three distinct outcomes with separate counts: an internal host server name, an opaque server id, and a malformed manifest.
Details
- The error text now states that built-in Claude app servers are never exposed to pages as host servers.
- It lists the connectors seen during the session so you can pick a valid
servervalue.
Evidence
internal_host_server_name
Strings lifted out of the shipped bundle, so the claim above can be checked against them.