Migrate Python LangChain Deep Agents applications to Pydantic AI and Pydantic AI Harness. Use when the source uses the upstream `deepagents` package or demonstrably reproduces its middleware, backends, skills, memory, subagents, or sandbox contracts. Use `migrating-langchain-to-pydantic-ai` for plain LangChain, LangGraph, or LCEL migrations and `pydantic-ai-harness` for greenfield Harness usage.
Install
npx skills add pydantic/skills --skill migrating-deep-agents-to-pydantic-ai-harnessnpx skills add pydantic/skills --skill migrating-deep-agents-to-pydantic-ai-harness -a claude-code -gnpx skills add pydantic/skills --skill migrating-deep-agents-to-pydantic-ai-harness -a codex -ggemini skills install https://github.com/pydantic/skills.git --path skills/migrating-deep-agents-to-pydantic-ai-harnessgh skill install pydantic/skills migrating-deep-agents-to-pydantic-ai-harnessgit clone --depth 1 https://github.com/pydantic/skills /tmp/pydantic__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/pydantic__skills/skills/migrating-deep-agents-to-pydantic-ai-harness ~/.claude/skills/migrating-deep-agents-to-pydantic-ai-harness # Claude Code
cp -R /tmp/pydantic__skills/skills/migrating-deep-agents-to-pydantic-ai-harness ~/.agents/skills/migrating-deep-agents-to-pydantic-ai-harness # Codex, Cursor, Gemini CLI, Copilot, OpenCode