You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.302,
ImprovementsSection of the release
What
MCP (Model Context Protocol) is the standard Claude Code uses to connect to outside servers that give Claude extra tools. When Claude Code works out the protocol version with a server automatically, these things are different:
If a server's result leaves out the required fields resultType, ttlMs or cacheScope, Claude Code fills them in instead of rejecting the result, and logs this once per kind of request.
A web request to a server can be sent again once, after a check approves the retry.
Reconnecting to a long-running MCP task has a new option to take a single quick look, without redialing the stored connection or waiting.
Why
Servers that speak the 2026-07-28 version of the protocol but leave out required fields should now connect instead of failing.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeFixed MCP servers showing no tools, or every tool call failing, when the server negotiates protocol version 2026-07-28 but omits resultType…
