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Sweep 23 Oct 2026 · 21:48Z Build v2.1.310 529 read Stable v2.1.308 Latest v2.1.310 Next v2.1.310 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.310 ·

MCP tool-list requests are now told apart from setup requests

Claude Code now classifies requests that list an MCP server's tools separately from the server's opening setup requests

Under the hood Internal Changes
JSON All of v2.1.310
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 v2.1.310,
Internal ChangesSection of the release

Unclear What the separate handling of tool-list requests changes for users is not known.

What

MCP servers are outside programs that give Claude Code extra tools. When Claude Code inspects requests sent to one, it used to only mark whether a request was part of the opening setup. It now sorts requests into:

  • setup, for the opening handshake messages
  • listing, for requests that ask the server for its list of tools
  • neither, for everything else
Why

This suggests requests that list a server's tools may now be handled differently from setup traffic, for example with their own timeouts or retries.

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 the separate handling of tool-list requests changes for users is not known.

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