Streaming Agents with Pydantic AI over Typed WebSockets: Tools, Approvals, and a Generated Client
A practical guide to building typed WebSocket UIs for Pydantic AI agents, with streaming, tool calls, approval flows, AsyncAPI, and tests.
This article discusses the challenges faced when building real-time products, particularly in handling WebSockets and agent frameworks. The author built two tools to address these issues: chanx for WebSockets and Pydantic AI for agent frameworks. Pydantic AI provides typed tools, outputs, and dependency injection, which integrates well with chanx for a seamless development experience.
The author then explains how to create a bidirectional WebSocket agent using these tools, with a focus on the message contract and handling approval requests for destructive tools.
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