You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.315,
ImprovementsSection of the release
What
mcp_authenticate signs in to an MCP server, an outside service that gives Claude extra tools. It now checks your organization's managed policy again right before it starts the sign-in, and again when it falls back to a custom redirect address. Before, it checked policy only once, at the start.
It also now stops if the Claude account you are signed in with changes while the sign-in is starting. The error says the Claude account changed while sign-in to the MCP server was starting, and asks you to try again.
Why
Sign-in can no longer go through if a policy block or an account switch happens in the moment between the first check and the sign-in itself.
