Don't Build Agents, Build Skills Instead — Barry Zhang & Mahesh Murag
by AI Engineer
Anthropic's case that the unit of agent capability is a folder of markdown and scripts.
Overview
Barry Zhang and Mahesh Murag open with the observation that model intelligence has advanced quickly and the industry has converged on broadly similar agent scaffolding, leaving domain expertise as the binding constraint: raw capability alone does not make an agent good at legal review or a financial close. Their answer is Agent Skills. A skill is a folder of markdown instructions plus scripts that packages procedural knowledge an agent can load on demand. Because a skill is just files, it can live in Git or Google Drive, be versioned and reviewed like code, and be read and edited by humans as easily as by agents. The talk stresses progressive disclosure, where the agent sees skill metadata first and loads full contents only when relevant, which is what keeps a large skill library from flooding the context window. It draws a clean line against MCP: MCP provides connectivity to external systems, while skills provide the expertise needed to use those connections well. Five weeks after launch the speakers describe thousands of skills across three categories: foundational skills, third-party partner skills such as Browserbase's browser automation, and enterprise-internal skills at Fortune 100 companies. They note skills being authored by finance and legal staff rather than only engineers, and close by framing skills as an applications layer built on top of agents.
At a Glance
- Topic
- Skills
- Level
- Intermediate
- Format
- Video
- Cost
- Free
- Duration
- ~16 min conference talk
- Provider
- AI Engineer
- Hands-on
- No
- Certificate
- None
What You’ll Learn
- ✓Explain why domain expertise, not scaffolding, now limits agent usefulness
- ✓Structure a skill as a folder of markdown instructions plus executable scripts
- ✓Use progressive disclosure to keep a large skill library out of the context window
- ✓Distinguish what MCP solves from what Agent Skills solve
- ✓Recognise the three skill categories: foundational, third-party partner and enterprise-internal
- ✓Version, review and share skills through ordinary Git or file-sharing workflows
- ✓Judge when a non-engineer can author a useful skill without writing code
Highlights
- •Straight from the Anthropic team that shipped Agent Skills, five weeks after launch
- •Argues a specific architectural position rather than surveying the landscape
- •Names real adoption categories and partners instead of hypothetical use cases
- •Sixteen minutes, and the shortest credible explanation of skills versus MCP
- •Treats bash and the filesystem as the scaffolding, which is unusually concrete
Who It’s For
Best For
- ✓Engineers deciding between building an agent and writing a skill
- ✓Platform teams designing how internal expertise gets shared with agents
- ✓Anyone already using MCP who wants to know where skills fit
Prerequisites
- •Basic familiarity with LLM agents and tool use
- •Some exposure to MCP is helpful but not required
FAQ
What is Don't Build Agents, Build Skills Instead — Barry Zhang & Mahesh Murag?
A conference talk from Anthropic's Barry Zhang and Mahesh Murag, published on the AI Engineer channel in December 2025, arguing that once model capability and agent scaffolding have converged, the remaining gap is domain expertise, and that the right way to close it is packaging procedural knowledge as portable Agent Skills rather than building yet another bespoke agent.
Is Don't Build Agents, Build Skills Instead — Barry Zhang & Mahesh Murag free?
Don't Build Agents, Build Skills Instead — Barry Zhang & Mahesh Murag is free to access.
What level is Don't Build Agents, Build Skills Instead — Barry Zhang & Mahesh Murag for?
Don't Build Agents, Build Skills Instead — Barry Zhang & Mahesh Murag is aimed at a intermediate audience. Recommended background: Basic familiarity with LLM agents and tool use, Some exposure to MCP is helpful but not required.
How long does Don't Build Agents, Build Skills Instead — Barry Zhang & Mahesh Murag take?
Expect roughly ~16 min conference talk. Most learners work through it at their own pace.
What will I learn from Don't Build Agents, Build Skills Instead — Barry Zhang & Mahesh Murag?
You'll learn: Explain why domain expertise, not scaffolding, now limits agent usefulness; Structure a skill as a folder of markdown instructions plus executable scripts; Use progressive disclosure to keep a large skill library out of the context window; Distinguish what MCP solves from what Agent Skills solve; Recognise the three skill categories: foundational, third-party partner and enterprise-internal; Version, review and share skills through ordinary Git or file-sharing workflows; Judge when a non-engineer can author a useful skill without writing code.
Topics
Sources
This page was written from 3 sources, 2 on domains other than youtube.com.