Subvolts take Anthropic builds an open AI ecosystem by sharing standards, not by owning the whole stack. Jul 14, 2026 - Developers
- Learn about Anthropic's layered platform and how they enable external builders and agent interoperability through open standards.
- Business
- Understand Anthropic's strategy for fostering an open AI ecosystem and their approach to partnerships and industry standards.
This is a solid interview with Anthropic leaders discussing their developer platform and ecosystem strategy.
Anthropic's Katelyn Lesse & Angela Jiang: Building an Ecosystem, not a Walled Garden
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From Subvolts
Summary and analysis by Subvolts editorial, AI-assisted.
Anthropic's Katelyn Lesse and Angela Jiang discuss building an open AI ecosystem, not a walled garden. They explain their three-layer developer platform: knowledge, execution, and coordination. Their strategy focuses on open standards and interoperability, allowing agents to work together, while keeping model routing proprietary to tune harnesses for specific model families like Claude.
Anthropic's Katelyn Lesse and Angela Jiang describe their system for AI tools as a three-layer cake. They want anyone to build on top of it, like how electricity became widespread because everyone could plug in, not because one company controlled everything.
This episode offers insight into Anthropic's developer platform strategy, framed as an open ecosystem. Listeners learn about their layered architecture and their bet on industry standards for agent interoperability. It's for developers and product managers interested in how AI platforms are being built and integrated. This contrasts with more closed approaches and highlights Anthropic's focus on enabling external builders, aligning with broader industry trends toward open standards in AI.
- HostSequoia Capital
- GuestKatelyn LesseAnthropic
- GuestAngela JiangAnthropic
- Guests: Katelyn Lesse and Angela Jiang
- Show: Training Data (Anthropic)
- Length: 49 minutes
- Platform Layers: Knowledge, execution, and coordination
- Partnerships Mentioned: Modal, Vercel, Cloudflare
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
- meta-harnesses
- Angela Jiang
- advanced instructions or strategies that guide AI agents
- MCP spec
- Katelyn Lesse
- a standard specification for AI agent communication and interaction
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2 h 09Questions people ask
- What is Anthropic's developer platform strategy?
- Anthropic views its developer platform as a three-layer stack: knowledge, execution, and coordination, focusing on open standards and interoperability for agents.
- Does Anthropic want to own the entire AI stack?
- No, they are not precious about owning the stack and partner with companies like Modal, Vercel, and Cloudflare, emphasizing sound architecture and open standards.
Page generated Oct 19, 2026. Summaries are Subvolts' own; the audio, artwork and notes belong to Sequoia Capital.