You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
SDKArea: what it touches
Bug FixesKind: in v2.1.301,
Bug FixesSection of the release
What
MCP (Model Context Protocol) servers are the add-ons that give Claude extra tools. SDK servers are those supplied by a program that embeds Claude Code.
When Claude Code refreshes its MCP state, it now also re-applies SDK servers listed in sdkServersUpdated whose configuration is unchanged since the last snapshot. The quick check for whether anything needs doing considers these too. Before, only added, removed and changed servers were merged.
When checking on a long-running MCP task returns error -32602, Claude Code no longer fails at once. It logs "the server rejected the task's id (-32602); asking again" and retries, within its reconnect allowance. Before, -32602 failed straight away as expired or unknown to the server.
Why
Updates to SDK servers should no longer be lost, and long MCP tasks are less likely to fail when the server is restarted.
