How to Build Claude Subagents Better Than 99% of People

In This Issue

• Sub-agents let you delegate bulk work to cheap models. Here's how to build them right.
• Santella had no experience with this tech two weeks ago. Today she has a working automation.
• Anthropic released Fable 5. Stripe used it to finish a two-month migration in one day.

New Video:

How to Build Claude Subagents Better Than 99% of People

Sub-agents let your main Claude session delegate work to separate sessions running cheaper models. The main session stays uncluttered. The bulk work runs in parallel at a fraction of the compute cost.

The mistake most people make: Running everything through one session. Context fills up, you pay Opus rates for tasks Haiku could handle, and nothing runs in parallel. Sub-agents fix all three — but only if they're configured correctly.

How this helps you: You'll know when to use sub-agents, how to build the YAML file so Claude actually invokes them, and when to skip them entirely. Faster pipelines, lower compute costs, and no more grinding through tasks that could run side by side.

Winning Is All We Do

Santella built a working email-to-Sheets automation in 24 hours

What happened: Two weeks ago, Santella Austin knew nothing about this technology. This week she shipped a working automation that logs emails directly into Google Sheets. When rows stopped being added, she didn't just report the bug. She used Claude to find the root cause herself and fixed it.

The opportunity for you: Twenty-four hours of focused work. A real system running. That's the pace this community moves at. You don't need years of experience to ship something useful. You need the right environment and the willingness to stay in it.

Stories like this happen every week inside AIS+. AIS Live (July 11-12) is where you see exactly how: practitioners walking through real projects on stage, from first idea to working system.

In the News

Anthropic Releases World's Strongest AI, Fable 5

The news: Anthropic released Fable 5 on June 9. It's the most capable model the company has made publicly available. Stripe put it to work on a 50-million-line codebase migration that would have taken a team two months. It took one day. Pricing is $10 per million input tokens and $50 per million output tokens. Available now via the Claude API, with a phased rollout on subscription plans through June 22.

How it affects automation: The standout capability is autonomy. Fable 5 holds context across millions of tokens and can drive extended, multi-step projects without losing the thread. Tasks you'd normally supervise closely can now run longer on their own. For builders, that changes the scope of what you can delegate and how long you can step away.