You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
Bug FixesKind: in v2.1.286,
Bug FixesSection of the release
What
MCP servers are outside programs that give Claude extra tools. Elicitation is a feature that lets a server ask you for information through a form or a link. Servers built with Java MCP SDK 0.17.0 or older can reject that feature when Claude Code connects.
Before, Claude Code reconnected once without elicitation. Now:
the first rejection makes Claude Code redial straight away with a connection that leaves elicitation out
if the server rejects it again on that reconnect, Claude Code redials once more in legacy mode, the older HTTP plus SSE way of connecting
The legacy fallback is still controlled by the same remote setting as before.
Why
Older Java MCP servers that refuse elicitation are more likely to connect instead of failing.
Read from
Feature flag
tengu_mcp_legacy_sse_fallbackNot 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 v2.1.286: 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.
