Ask HN: In Cursor/agents, do plugins hide MCP tools from the main agent?

Quick architecture question.

When using MCP servers directly in Cursor, the agent seems to see all tools at the same level.

But when using a plugin/extension that internally connects to MCP servers, does the main agent:

see only the plugin as a single tool and delegate to a sub-agent inside it, or

still see every underlying MCP tool individually?

In other words: do plugins act as a tool abstraction boundary, or just a packaging/install mechanism?