Source Intelligence

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

All of v2.1.227 Home All releases olderv2.1.226 v2.1.228newer
Claude Code v2.1.227

MCP connection timeouts are retried and never undercut the global timeout

You'll notice
Useful4 Signal3
MCP Notable

MCP connect timeouts now respect the global timeout and get retried instead of failing.

Feature flag
tengu_mcp_connect_timeout_retry 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 v2.1.227: 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 v2.1.227. It isn't a statement about your account. What a flag value here can and cannot tell you

What

The connect timeout for an MCP server is now the larger of that server's own value and the global MCP timeout, so a small per-server value can no longer make connections fail early. Connection timeouts are tagged CONNECT_TIMEOUT and retried instead of failing outright, including timeouts raised by the MCP SDK itself. Controlled by the tengu_mcp_connect_timeout_retry flag, which is on unless the server turns it off.

Details
  • the SDK's own RequestTimeout error is mapped onto the same CONNECT_TIMEOUT code so it retries too
Evidence

tengu_mcp_connect_timeout_retry

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

See this entry in the whole of v2.1.227 →