PydanticAI repo
Type safe Python framework for building LLM agents, with a CLI called clai, sandboxed workspace backends, and a standalone AI Gateway for routing across model providers.
What it does for you: Gives Axion and Hermes a typed agent layer that catches schema mistakes before they reach a model call, and its new unified ctx.workspace lets Coder, FileSystem, and Shell tools run the same way whether YY is testing locally or inside a Modal sandbox. Matches the typed-agents-pydantic-ai skill already in YY's kit, so adoption is mostly wiring, not new learning.
In practice: Reads like a natural extension of Pydantic's validation habits applied to agent loops, not a bolt on framework.
For: Both runtimes. Pure Python library with no Claude Code specific hooks, runs the same inside Axion or a standalone Hermes process.
Verdict: build now. Direct match to an existing skill, low setup cost, typed interfaces reduce runtime errors, strong maintainer.
Build #1 PydanticAI: use the ai-implementation-build-intake skill to build this safely. Source: https://github.com/pydantic/pydantic-ai. Save canonical skill/agent under AXION\Skills and AXION\Agents.
Source · Version 2.54.0 released 2026-10-02, daily point release cadence confirms active maintenance, maintained by the Pydantic core team.