Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.248,
Internal ChangesSection of the release
What
The MCP client body and the blocked-hook error display differ only in generated variable names and cache slot numbers. No change to tool calls, header filtering, pagination limits or error text.
Evidence
subscriptions/listen requires a 2026-07-28-era connection
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
