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Sweep 27 Oct 2026 · 19:04Z Build v2.1.312 531 read Stable v2.1.308 Latest v2.1.312 Next v2.1.312 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.311 ·

Claude Code can retry MCP servers that failed to connect when searching tools

Built in behind a server switch: during a tool search, Claude Code can retry some web-based MCP servers that failed to connect

Under the hood Internal Changes
JSON All of v2.1.311
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.311,
Internal ChangesSection of the release

Unclear What the server switch falls back to when the server sends nothing is not stated.

What

MCP servers are outside programs that add tools to Claude Code. A new helper lets Claude Code dial again to an MCP server that failed to connect, so a tool search can use that server's tools. It runs only when a server-controlled switch allows it.

A server qualifies only when all of these are true:

  • it connects over the web (HTTP or SSE)
  • its address is a public hostname
  • its URL contains no credentials and no query string
  • it has no OAuth (sign-in) configuration
  • it has failed fewer than a set number of retries

A second new function removes stored MCP sign-in tokens for one server at a time.

Why

This is automatic reconnection for MCP servers during tool search. It stays inactive unless the server switch is turned on.

Read from
Feature flag
tengu_floating_lagoon Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.311: off

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.311. It isn't a statement about your account. What a flag value here can and cannot tell you

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 server switch falls back to when the server sends nothing is not stated.
The name it cites is new in this buildNew in this build: tengu_floating_lagoon

See this entry in the whole of v2.1.311 →

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