Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.286,
Internal ChangesSection of the release
What
MCP (Model Context Protocol) is the standard Claude Code uses to connect to outside servers that give it extra tools. Claude Code keeps a note of whether each server spoke an older or newer version of that protocol, so it can connect the right way next time.
That note used to be kept only for servers reached through claude.ai. It is now kept for other kinds of server as well. Claude Code also changes its assumption about a server's protocol version when an error comes back on a later request, not just on the first one.
Why
This changes how Claude Code settles on a protocol version with MCP servers that do not come through claude.ai, which may affect how those servers connect.
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not clear exactly which kinds of MCP server now have their protocol version remembered.
Anthropic's release notes agreeFixed claude auth status reporting a Console sign-in's stored API key as claude.ai; it now reports api_key, and the VS Code extension treats…
