Claude can wait briefly for MCP servers that are still connecting, then continue once their tools are available.
Claude calls WaitForMcpServers when an MCP server is still connecting.- The new
WaitForMcpServerstool waits for all pending servers, or for specific server names. - Results distinguish connected, failed, still pending, needs-auth, disabled, and unknown servers.
- Missing-tool guidance now tells Claude when a requested MCP tool belongs to a server that is still connecting.
- The tool is gated by
tengu_ashen_kelp, so it may not be visible for every user yet.
MCP wait tool and gated enablement (search for "WaitForMcpServers" and "The MCP server '")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
tengu_ashen_kelp On for this account, and not off by defaultThe flag server returned on for the one account this site reads, and nothing in this release compiles it off by default. The compiled default is shown below, and says which it is when we cannot read one: a fifth of gates compile in a string or a number rather than on or off, and most published releases have no gate table behind them at all. No client can see what the server returns for your account.
This account: on · anonymous baseline: on · compiled default in v2.1.132: no gate table built for this version
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 v2.1.132. It isn't a statement about your account. What a flag value here can and cannot tell you
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.