Charlie HillsFree guide · Claude & Claude Code
5 rules for Fable 5.2 before you let it loose
The five settings and habits that keep Fable 5.2 fast, cheap and safe: effort level, one agent, style first, Opus with a Fable advisor, and approval before anything gets sent. Every command and prompt included.
Charlie Hills Added 13 November 2026 · Free
What’s inside
- 1The five rules at a glance
- 2Rule 1: Keep effort on medium
- 3Rule 2: One agent owns the whole project
- 4Rule 3: Show it what good looks like
- 5Rule 4: Opus builds, Fable checks
- 6Rule 5: Nothing gets sent without your OK
- 7When something doesn't work
The five rules at a glance
|
Rule |
What you do |
Time |
|
1. Keep effort on medium |
Type /effort and pick medium |
30 seconds |
|
2. One agent owns the project |
Paste the one-agent brief |
2 minutes |
|
3. Show it what good looks like |
Paste the style-first prompt with your examples |
3 minutes |
|
4. Opus builds, Fable checks |
Type /model opus, then /advisor fable |
30 seconds |
|
5. Nothing gets sent without your OK |
Paste the permissions prompt |
3 minutes |
Rule 1: Keep effort on medium
Low and medium effort handle almost everything with Fable 5.2. Extra high is very, very slow, and it only pays off on the thorniest problems.
In Claude Code, type:
/effortPick medium. Save extra high for one hard problem you're happy to walk away from while it runs.
What you should see, and the check
Claude Code shows the effort picker and confirms the new level. The check: your next simple request should come back in seconds, not minutes. If it still crawls, run /effort again and check it says medium.
That’s the first part. The rest of this guide is free too.
