MCP servers are outside programs that give Claude Code extra tools. When Claude Code connects to one, it gives up after a time limit. That limit is now measured with a clock that keeps track of how long the computer has been awake, instead of the ordinary system time.
Two smaller changes come with it. A tool call that fails to send is now recorded as a request that never ran, rather than one that was answered. The tracking of sent tool calls has also been moved into a single shared piece of code.
This is meant to stop a connection from timing out only because the computer went to sleep while it was connecting, for example when you close a laptop lid.
tengu_mcp_legacy_sse_fallback Not enough to sayNothing 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 v2.1.307: on
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 v2.1.307. It isn't a statement about your account. What a flag value here can and cannot tell you