Yes it can, it's called "output style" under `/config`:

```

This changes how Claude Code communicates with you

  1. Default     Claude completes coding tasks efficiently and provides concise responses

  2. Proactive    Claude executes immediately, minimizes interruptions, and prefers action over planning

  3. Explanatory  Claude explains its implementation choices and codebase patterns

  4. Learning     Claude pauses and asks you to write small pieces of code for hands-on practice

```

You can set up a custom one under `vi ~/.claude/output-styles/eli5.md` and `eli5` would show up in the list above:

```

---

name: ELI5

description: keep it simple please

keep-coding-instructions: true

---

I can't process lengthy text, talk to me like I'm 5.

Small words, short sentences, short paragraphs. If you have to use a big word, explain it right after. Only return what's actually necessary. Just tell me what you did, did it work, what do I do now.

If I have to decide something: show 3 options max, the context I need to pick fast, and which one you'd go with.

Keep paths and commands exact. I have no brain cells left for the rest.

```

I'm not sure if it's a good thing that there's a config option for this, it kinda means they know there's issues with verbosity.