I was just wonering this myself, and the Context7 recommendation led me to these examples on its repo:

- Create a basic Next.js project with app router. use context7

- Create a script to delete the rows where the city is "" given PostgreSQL credentials. use context7

I feel like that Claude Code has independently invoked MCP Fetch a couple of times in the course of hundreds of interactions, but yes — it looks like specifically invoking them is the norm, at least until LLMs get better at matching tools to requests.