Anthropic's Katelyn Lesse & Angela Jiang: Building an Ecosystem, not a Walled Garden

Katelyn Lesse and Angela Jiang lead the team building Anthropic's developer platform - the layer that both outside builders and Anthropic's own products run on top of. Angela frames the platform as a three-layer stack: knowledge, execution, and coordination. She argues the real leverage is what’s at the top: "strategies," or meta-harnesses that give each token a different job, from advising to executing to reflecting to memory. On the question of open ecosystem vs. walled garden, they say they aren't precious about owning the stack. Katelyn points to Anthropic's self-hosted sandboxes with partners like Modal, Vercel, and Cloudflare. Whether the work runs on Anthropic's infrastructure or someone else's, what really matters to them is that the architecture is sound. The deeper bet is standards: they hand skills and MCP to the whole industry, build connectors on the MCP spec, and help agents (Claude and non-Claude) work together. The one place they stay closed is model routing: they argue harnesses should be tuned to a model family, so they're designing for Claude rather than routing across models. Angela's frame for the ecosystem bet is electricity: transformative only because everyone could plug in, and no company wired it alone.
Hosted by Sonya Huang and Lauren Reeder, Sequoia Capital

00:00 Introduction

01:49 Two North Stars

02:27 External Builders And Primitives

03:54 What To Externalize

06:00 From Messages To Agents

08:19 Managed Agents Adoption

09:07 Three Layer Cake

10:22 Execution Harnesses Explained

11:09 Coordination Strategies Roadmap

12:13 Ecosystem Standards And Safety

15:39 Open Ecosystem Not Walled

17:12 Vertical Products And Form Factors

22:26 Claude Tag Under The Hood

26:04 Harness Best Practices

38:13 Token Costs And Whats Next