You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
MCPArea: what it touches
Bug FixesKind: in v2.1.219,
Bug FixesSection of the release
What
An MCP config with a literal __proto__ key under mcpServers used to be swallowed by prototype semantics, loading nothing and saying nothing. It is now detected and reported.
Details
Surfaces as a validation warning with skipReason reserved_name, which feeds the new skipped-server reporting
Warning messages and suggestions are now passed through a sanitizer before being pushed
Evidence
"__proto__" is a reserved MCP server name and was not loaded
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
