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Naming a locally-configured MCP server where a claude.ai connector is expected now gives a distinct host_unavailable error.
Publishing or declaring capabilities now surfaces a distinct host_unavailable error when a name refers to a locally-configured MCP server rather than a claude.ai connector. The error explains that host-configured servers aren't available in that session and points to using the connector's display name instead, or clearing the mcp capability.
Names in the bundlehost_unavailable