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Sweep 12 Nov 2026 · 23:00Z Build v2.1.323 540 read Stable v2.1.311 Latest v2.1.323 Next v2.1.323 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.323 ·

SDK token refresh requests now say why, and server records note where a server came from

Agent SDK token refresh requests now carry a reason, and MCP server records can note whether a server came from Anthropic, claude.ai or the user

Under the hood Improvements
JSON All of v2.1.323
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SDKArea: what it touches
ImprovementsKind: in v2.1.323,
ImprovementsSection of the release
What

The Agent SDK is the toolkit that lets other programs, such as desktop apps, run Claude Code. Three of its message formats change:

  • MCP server settings (for add-ons that give Claude extra tools) gain an internal field recording where the host got the server: Anthropic, a claude.ai connector, or the user's own setup.
  • The request to refresh a sign-in token gains a field saying whether the token was refused or not.
  • The request asking the host app to refresh its own sign-in token gains a status of 401 or 403, the two usual web codes for a rejected sign-in.
Why

Apps built on Claude Code, such as Desktop and Cowork, can tell why a token was asked for and where an MCP server came from.

See this entry in the whole of v2.1.323 →

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