Morgan Stanley: AI agents will add $16 trillion to the stock market

Welcome back to Building AI Agents, your biweekly guide to everything new in the field of agentic AI!

If none of the AI agents is blowing its bonus on a Ferrari after its 3rd divorce, I don’t believe this actually mirrors the dynamics of real-world trading firms.

🏖️ There will be no issue of Building AI Agents next Monday, September 1 for the Labor Day holiday. Unlike LLMs, human writers need R&R.

In today’s issue…

• Agents could add $16 trillion to the S&P 500

• Prompting 101

• 15 enterprise agent playbooks

• Do you have too many AI products?

• Best practices for building agentic systems

…and more

🔥 IN CASE YOU MISSED IT

Readers’ favorite items from the past week

1. A huge collection of practical agent apps

2. The best agents from OpenAI’s GPT-5 hackathon

3. How to use agents as a data scientist

4. 10 essentials for enterprise MCP servers

5. Building trustworthy agents