MCP permission rules can match tools by an extra alias name

MCP tools are tools supplied by an MCP server, an add-on that connects Claude Code to outside tools and data. When Claude Code decides whether a permission rule applies to one of these tools, or whether to defer it (hold its full description back until it is needed), it can now also match the tool by an alternative name called nameKey. This extra match is used only when an internal check is on.

Tool search, the step that loads deferred tools when needed, also now treats a tool as costing nothing when it is marked free and no tools match.