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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.301 ·

SDK-type MCP servers can now be recognised as one of Claude Code's own servers

A check that recognises a particular built-in session MCP server now also accepts SDK-type servers that meet several conditions

Under the hood Internal Changes
JSON All of v2.1.301
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.301,
Internal ChangesSection of the release

Unclear What being recognised as this server allows or changes is not stated.

What

MCP servers are add-on programs that give Claude Code extra tools. Claude Code has a check that recognises one particular server of its own used inside sessions. Before, only http servers added during a session could match. Servers of type sdk can now match too, when all of these hold:

  • the server announces a matching server ID
  • its name is the expected one
  • it is not running in remote mode
  • a particular environment setting is not set
Why

This changes which servers Claude Code treats as this particular first-party server.

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 doubtWhat being recognised as this server allows or changes is not stated.

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