I've had a similar thought. A super refactor feature would be amazing, but wouldn't fit into the current zeitgeist of agent everything. Hopefully as the hype starts to die down and prices go up, we'll get some of these smaller, more targeted features.
You don't need a special feature for this. Just tell the coding assistant what to do.
Then watch it f'up half your codebase because it thinks it's slightly related to your examples. The alternative, giving it 10 examples, is actually more work.
I don’t think you’ve actually used any of these tools. 10 different examples in the same session would almost certainly make them perform worse.