Meet LangSmith Agent Builder: An AI Agent That Helps You Build Custom AI Agents in 5 Minutes (No-Code)

Throughout 2025, we have seen plenty of companies and platforms promising tools that can help you vibe-code a full-stack app, automate your tasks, or build custom AI agents. While AI agents are the future at the current stage, building a custom AI agent isn't as simple as many platforms make you believe. I have tried multiple platforms throughout 2025 that promised the world, but I didn't go back to them. So, when LangChain announced the public beta of LangSmith Agent Builder, I thought I would be exactly like the other platforms I used. However, I might be wrong.

What is LangSmith Agent Builder?

LangSmith Agent Builder by LangChain is exactly what the name suggests: an AI agent-building platform that lets anyone build production-ready agents simply by chatting. You interact with LangSmith Agent Builder via chat, where you can describe the agent you want, and it iteratively builds prompts, chooses tools, and configures the agent's behavior.

Unlike traditional automation platforms, which require you to drag and drop nodes on a canvas and often come with a steep learning curve, LangSmith Agent Builder offers a simple chat-based interface for building agents.

What is under the hood?

You now know what LangSmith Agent Builder by LangChain is and what it does. But what makes it so capable? According to LangChain, LangSmith Agent Builder itself is an agent designed to help you build your own custom AI agent. It is trained on best practices LangChain has learned from millions of developers building and deploying agents at scale, from startups to large enterprises. The idea is that non-technical users get a fast way to create useful agents, while technical teams still retain control over tools, governance, and integrations.

Here are the standout features of the new Agent Builder:

• Chat-Driven Development: You can build and update agents using natural language. If the agent isn't performing correctly, you simply tell the builder what to change, and the system automatically updates the prompt.
• Bring Your Own Tools (MCP): The platform supports the Model Context Protocol (MCP), allowing developers to connect internal APIs and systems once and then let anyone in the workspace use those tools in their custom agents securely.
• Workspace Collaboration: Agents are no longer isolated in your own workspace. You can browse, copy, and clone agents created by your teammates. If a sales representative builds a great research agent, a marketing manager can clone it and tweak it for competitor analysis.
• Multi-Model Support: Users aren't locked into a single provider. You can choose between different AI models, such as those from OpenAI or Anthropic, depending on which performs better for your specific task.
• Programmatic Invocation: For the technical users, these agents aren't just stuck in a web interface. They can be called via API, meaning an agent built via chat can be embedded directly into existing software or workflows.

How to build your own AI agent in 5 minutes using LangSmith Agent Builder:

The LangSmith Agent Builder is fairly straightforward to use. You start by describing the agent you want to build in a one-line prompt, approve the right tools, and let your agent figure out the approach. Agent Builder can help you write the prompt, which can often be several paragraphs long or longer, and the agent uses long-term memory to learn from your feedback over time.

Prompt example: A market research assistant for the latest AI research and AI tools/agents launch.

You can choose the AI model or add a custom AI model based on your preference.

If you want to make changes, just tell Agent Builder what to update. The agent stores your guidance in its system prompt without you needing to rebuild from the start.

In Conclusion:

LangSmith Agent Builder makes it easier for anyone to build an agent without needing coding knowledge or the need to drag and drop nodes. It meaningfully lowers the barrier for non-developers to participate in agent design while still giving engineering and IT teams the control they need. LangSmith Agent Builder is free for Plus and Enterprise users during the beta period.