Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.265,
Internal ChangesSection of the release
What
When deciding whether an MCP tool (a tool provided by an external MCP server) is allowed to run, Claude Code now first asks a permission checker registered by the SDK (software development kit), if one is present. Only if that doesn't produce a decision does it fall back to the built-in permission-rule logic and design-consent checks it used before.
Why
This lets code built on the Claude Code SDK plug in its own custom permission logic for MCP tools, taking priority over the default rules.
