LangChain Upgrades Agent Builder With File Uploads and Unified Tool Registry

LangChain rolled out a significant update to its LangSmith Agent Builder on February 18, introducing file upload capabilities, a centralized tool registry, and the ability to convert any chat conversation into a reusable AI agent.

The update arrives roughly five weeks after Agent Builder moved from public beta to general availability on January 13, 2026, signaling an aggressive development pace for the no-code AI agent platform.

What Changed

The headline feature is a new persistent "Chat" agent that maintains access to every tool connected to a workspace—Slack, Gmail, Linear, Pylon, and any remote MCP servers. Users can now run ad hoc queries like pulling open Linear tickets or summarizing Slack channels without first configuring a dedicated agent.

File uploads represent a capability gap that's now closed. Users can drop CSVs, images, and text documents directly into conversations. A sales team could upload quarterly numbers and ask for trend analysis. Someone could snap a whiteboard photo and have it converted to a Google Doc. Style guides and existing prompts can serve as reference material when building new agents.

The "conversation-to-agent" workflow addresses a friction point in agent creation. Work through a task conversationally, refine the output, then click once to save it as a recurring agent. No prompt engineering required—the conversation history becomes the configuration. These agents can then run manually, on schedules, or triggered by external events.

Tool Management Gets Centralized

A new tools registry consolidates authentication and management into one interface. Admins can view all connected tools, spot authentication issues immediately, and control which tools agents can access. When a new tool gets connected, it's instantly available across all agents in the workspace.

Only workspace administrators can add new tools—a governance feature that matters as organizations scale their agent deployments.

Context for Builders

LangSmith Agent Builder has evolved rapidly since its December 2, 2025 public beta launch. The platform targets non-developers who want production-ready AI agents without writing code, competing in an increasingly crowded space of no-code AI tools.

The free tier remains available for individual developers, with paid plans scaling based on per-seat fees and trace volume consumption. For teams already invested in the LangChain ecosystem, this update reduces the gap between experimenting with an idea and deploying an automated workflow.

Whether the conversation-to-agent pattern catches on will depend on how well the system captures user intent from natural dialogue. The approach bets that iterative refinement through chat beats traditional prompt engineering for most use cases.