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

Overview

Shownote

Highlights

Transcript

Chapters

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

Training Data

Jul 14
Training Data

Training Data

Jul 14
OverviewShownoteHighlightsTranscriptChaptersPins

Shownote

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

Highlights

Anthropic's platform leads, Katelyn Lesse and Angela Jiang, discuss their strategy for building a developer platform that supports both external builders and internal product teams. They outline a three-layer stack of knowledge, execution, and coordination, emphasizing that the real leverage lies in the top coordination layer, where meta-harnesses assign different roles to tokens. The conversation covers their philosophy on open ecosystems, the importance of standards like MCP, and their approach to model routing.
00:00
Coordination layer uses meta-harnesses to assign token roles
01:49
Maximum leverage for internal teams to ship AGI-pilled products
02:27
Supporting builders externally, speed internally
03:54
Equal primitives for all builders
06:00
Anthropic now provides out-of-the-box infrastructure for agentic workflows
08:19
AI-native startups prefer primitives; enterprises prefer packaged offerings.
09:11
The bottom layer is knowledge, including primitives like the Messages API, tools, skills, and memory.
10:23
The execution layer involves Claude performing tasks beyond just answering questions.
11:09
Coordination layer assigns roles to tokens
14:37
AI is like electricity, a transformative utility.
15:39
Anthropic favors an open ecosystem over a walled garden
17:12
Form factors are dynamic and must evolve with AI capabilities
25:02
The hidden part of the iceberg is the most challenging and valuable.
35:25
MCP makes agents modular and interoperable
38:13
Shift from token maxing to token rationalization

Chapters

Introduction
00:00
Two North Stars
01:49
External Builders And Primitives
02:27
What To Externalize
03:54
From Messages To Agents
06:00
Managed Agents Adoption
08:19
Three Layer Cake
09:07
Execution Harnesses Explained
10:22
Coordination Strategies Roadmap
11:09
Ecosystem Standards And Safety
12:13
Open Ecosystem Not Walled
15:39
Vertical Products And Form Factors
17:12
Claude Tag Under The Hood
22:26
Harness Best Practices
26:04
Token Costs And Whats Next
38:13

Transcript

Angela Jiang: The last layer of abstraction on top of this is probably the coordination layer. So you have knowledge and you have execution, and you have coordination. And at the coordination layer, we're beginning to think of these things called like stra...