Sweep 19 Sep 2026 · 02:36Z Build v2.1.278 500 read Stable v2.1.267 Latest v2.1.278 Next v2.1.278 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.261 ·

New mcp_set_servers binding-changed sync hook

MCP server config changes now trigger sync hooks to keep SDK hosts' binding state in sync.

TierUnder the hoodhow much it should matter to you
Useful2my rating, 1 to 5
Signal2worth watching, 1 to 5
AreaMCPwhat it touches
KindInternal Changesin v2.1.261,
Under the hood No documentation found

MCP server config changes now trigger sync hooks to keep SDK hosts' binding state in sync.

The control-request handler for mcp_set_servers now calls a .sync("binding_changed") hook before applying server config changes, with a .sync("startup") hook invoked earlier during session init. This appears to be new plumbing for keeping an SDK host's server-binding state in sync with dynamic MCP server updates.

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Names in the bundlemcp_set_servers

See this entry in the whole of v2.1.261 →