An MCP server is an add-on that gives Claude Code extra tools, and it sends Claude Code a list of those tools. Claude Code can now remove fields set to an empty value (null) from that list, including from each tool's own details, and it drops an empty marker for the next page of results.
This only runs behind the remote switch tengu_lovely_quail, which is off unless Anthropic's servers switch it on. Readings taken before this release found it off for this site's account.
It lets Claude Code cope with MCP servers that send empty values for optional fields instead of leaving them out.
tengu_lovely_quail Off in both readingsThe flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.
This account: off · anonymous baseline: off · compiled default in v2.1.323: 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 v2.1.323. It isn't a statement about your account. What a flag value here can and cannot tell you