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 v2.1.132 Home All releases olderv2.1.131 v2.1.133newer

MCP Wait For Servers [Gradual Rollout]

Feature flag
tengu_ashen_kelp On for this account, and not off by default

The 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

What

Claude can wait briefly for MCP servers that are still connecting, then continue once their tools are available.

Usage
Claude calls WaitForMcpServers when an MCP server is still connecting.
Details
  • The new WaitForMcpServers tool 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.
Evidence

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.

See this entry in the whole of v2.1.132 →