Pydantic AI Updates: May 28, 2026

1. Pydantic AI v1.103.0 Adds Prompt Management for McpServer

Pydantic AI. Pydantic AI v1.103.0 ships prompt management primitives for McpServer, message-timestamp support on the VercelAIAdapter, and eager input streaming for OpenRouterModel, alongside Bedrock model handling fixes and a UI file-URL security tightening. The McpServer prompt management piece is the most practically useful change: it lets MCP server authors register named prompts as first-class objects rather than relying on convention-only prompt files. Source