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Building more effective AI agents

Anthropic’s Alex Albert (Claude Relations) sits down with Erik (Multi-Agent Research and co-author of our blog post, Building Effective Agents) for a discussion on the evolution of agents over the past six months, including tips for building multi-agent systems, common multi-agent patterns, and best practices for using skills, MCP servers, and tools. 00:00 - Introductions 00:35 - Training Claude to tackle agentic tasks 1:30 - Making Claude more autonomous with code 3:20 - Using the Claude Agent SDK to build agents 5:00 - Tips for using Agent Skills 6:40 - The evolution of workflows and agents (workflows of agents) 8:30 - The value of simple agent architectures 9:30 - Building multi-agent systems: orchestrators, subagents, and tool calling 11:40 - Training Claude to use subagents 12:25 - Multi-agent use design patterns: parallelization, MapReduce, and test-time compute 13:20 - Coordinating problem solving with tools and subagents 14:15 - Common agent failure modes 15:00 - Best practices for getting started with building agents (context engineering, MCPs, and tools) 17:15 - The future of agents: coding, computer use, and beyond Read the original blog post: https://www.anthropic.com/engineering/building-effective-agents Learn more about Agent Skills: https://www.anthropic.com/engineering/equipping-agents-for-the-real-world-with-agent-skills

ErikguestAlex Alberthost
Oct 16, 202518mWatch on YouTube ↗

At a glance

WHAT IT’S REALLY ABOUT

How Anthropic builds, scales, and debugs effective Claude agents

  1. Claude’s agent strength comes from training on open-ended, multi-step tasks with tool use and reinforcement learning across environments like coding and search.
  2. Anthropic frames coding as a foundational agent skill because code can generate artifacts, automate repetition, and unlock capabilities in many non-coding domains.
  3. The Claude Code SDK provides a polished “agent loop” scaffold so developers avoid reinventing orchestration, tool execution, file interaction, and MCP integration.
  4. The ecosystem is shifting from rigid prompt workflows to agent loops, and further toward “workflows of agents,” where each stage is itself a closed-loop iteration with feedback.
  5. Multi-agent systems (orchestrator + subagents) enable parallelization, context protection, and higher-quality “test-time compute,” but increase complexity, observability challenges, and coordination overhead.

IDEAS WORTH REMEMBERING

5 ideas

Claude excels at agents because it was trained to act like one.

Erik attributes Claude’s performance to practice on open-ended problems requiring many steps, tool use, exploration, and iterative correction, reinforced via RL across domains (notably coding and search).

Treat coding as an enabling layer for many “non-coding” tasks.

Because an agent that can write and run code can generate files (e.g., spreadsheets, SVG diagrams) and automate repetitive actions (loops), coding capability spills over into broad productivity workflows.

Use Claude Code SDK to avoid rebuilding the core agent loop.

The SDK packages common agent infrastructure—iteration loops, tool execution, file interactions, and MCP connectivity—so developers can focus on domain tools and business logic rather than plumbing.

Skills turn one-off context into reusable agent capabilities.

Skills generalize “Claude MD” from notes into arbitrary reusable assets (templates, scripts, images, headshots), letting agents consistently draw on the same resources across tasks and projects.

Agent loops outperform static workflows when quality matters.

Instead of one-shot steps that can silently fail (e.g., bad SQL leading to broken downstream charting), closed-loop agents run, observe outputs, and iterate until they reach a correct intermediate result.

WORDS WORTH SAVING

5 quotes

So during our training, we let Claude practice being an agent. We give it open-ended problems for it to work on, where it can take m- many steps and use tools, explore where it is and what it's working on before giving a final answer.

Erik

But once you have an amazing coding agent, a coding agent can do any other kind of work.

Erik

So yeah, I think that for a lot of cases, writing code to produce some artifact will be much better than just trying to create that artifact directly.

Erik

I still really believe that even though the models are much more capable today than they were a year ago, and they can work better in an agent or even more complex setups, I think that simplicity is still a really important thing, and that even though you can build a big workflow of agents, you should still start sort of by, from the simplest possible thing and then work up-

Erik

And I think actually tools for the model or MCPs should be one-to-one, uh, with your UI, not your API, because ultimately the model is a user of these things.

Erik

Agent training with RL and tool useCoding as a general-purpose agent primitiveClaude Code SDK as agent-loop scaffoldingSkills as reusable resources beyond instructionsWorkflows vs agent loops vs workflows of agentsMulti-agent orchestration and subagent tool-callingFailure modes: overbuilding and communication overheadTool/MCP design: model UI-first vs API-first

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