Pydantic AI v2: capable agentic loops

Pydantic AI v2 introduces a more advanced framework for developing AI agents by unifying various components into a single, composable unit called a "capability," which integrates instructions, tools, lifecycle hooks, and model settings. This approach allows agents to dynamically load tools and manage context, enhancing their adaptability and efficiency. The upgrade also emphasizes modularity, with core components remaining stable while additional features are developed in the Pydantic AI Harness, allowing for rapid innovation and community contributions. The release includes a shift in version policy, reducing the no-breaking-changes window between major versions from six months to three, to stay aligned with the fast-paced advancements in the field. The new capabilities, such as extended thinking, code mode, and tool search, demonstrate the framework's flexibility, while the integration of instrumentation allows agents to self-assess and suggest improvements. The system's design facilitates customization and scalability, enabling users to tailor agents to specific tasks while maintaining a stable core infrastructure.

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