I've seen great improvements with just two MCP servers: context7 and playwright. The first is great on planning sessions and leads to better usage of new-ish libraries, and the second is giving the model a feedback loop. The advantage is that they work with pretty much any coding agent harness you use. So whatever worked with cursor will work with cc or opencode or whatever else.
What I want is a Skill that leverages a normal CLI executable that gives the LLM the same capabilities of browser use.