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Pydantic AI Updates: August 7, 2026

pydantic-ai release agents tool-management

1. Pydantic AI v2.26.0 Adds Tool Hiding and First-Party Run Cancellation

Pydantic AI. Pydantic AI released v2.26.0, a feature-heavy update that introduces tool hiding via search, load_capability, or ToolReturn.tools, plus first-party run cancellation through AgentRun.cancel() and RunContext.cancel(). The release also adds a Model.resolve_prompt_cache_retention() method, promotes run_stream_events() to a public AgentRunEvents handle, and extends coverage to DeepSeek V4 Flash via OpenAIResponsesModel and DeepSeekProvider. Accompanying fixes address model_id forwarding through WrapperModel, OpenRouter reasoning mapping, and compacted-window transmission, giving developers finer control over agent runtime behavior and cost. Source