pydantic-ai-harness
Building with Pydantic AI Harness
Pydantic AI Harness is the official capability library for Pydantic AI. Core pydantic-ai ships the
agent loop and the capabilities that need model or framework support (thinking, web search, MCP, tool
search, workspaces, and provider-native compaction); the harness ships optional capabilities for longer,
more involved work: a coding stack, sandboxes, delegation, memory, context management, and controls. Harness
capabilities go in Agent(capabilities=[...]) and compose with each other and with core capabilities; a
few supporting pieces, such as media stores and the ACP server entry point, are used directly instead.
This skill covers pydantic-ai-harness. For the core framework -- agents, tools, structured output,
hooks, workspaces, and testing -- use the building-pydantic-ai-agents skill.