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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 v2.1.248 ·

MCP timeout and two new connection batch-size settings

Two new env vars set how many MCP servers connect at once, local and remote.

Use it now Notable Improvements
JSON All of v2.1.248
Use it nowTier: how much it should matter to you
4Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.248,
What probably matters to youSection of the release
What

MCP_TOOL_TIMEOUT is now read through the central environment reader rather than parsed inline, and two new environment variables control how many MCP servers are connected at once: MCP_SERVER_CONNECTION_BATCH_SIZE (default 3) and MCP_REMOTE_SERVER_CONNECTION_BATCH_SIZE (default 20).

Details
  • The old inline parse required a value greater than zero; both tool-timeout helpers now share the one source.
  • Raise the remote batch size if you have many remote MCP servers and startup connection is slow.
Usage
MCP_REMOTE_SERVER_CONNECTION_BATCH_SIZE=40 claude
Evidence

MCP_REMOTE_SERVER_CONNECTION_BATCH_SIZE

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from
Names in the bundleMCP_SERVER_CONNECTION_BATCH_SIZEMCP_REMOTE_SERVER_CONNECTION_BATCH_SIZEMCP_TOOL_TIMEOUT
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Confirmed since Anthropic's documentation has since written up MCP_TOOL_TIMEOUT, on Code in Claude Desktop on 3P. | `mcpToolTimeoutSec` | Applies your per-call MCP tool timeout to Code sessions as well, taking precedence over a user-set `MCP_TOOL_TIMEOUT`. | third-party/claude-desktop/code see the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up MCP_TOOL_TIMEOUT, on Code in Claude Desktop on 3P.

See this entry in the whole of v2.1.248 →

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