pydantic-ai-harness

79 / 100 · Review before installing

Check before installing. Some of what it can do is expected: a coding skill usually runs build and test commands.

By stanfish06/skillquarium (GitHub) · coding · 12 stars · scanned at commit ced6c96

Extend Pydantic AI agents with capabilities from pydantic-ai-harness -- the Coder coding agent, file and shell tools in local or sandboxed workspaces (Modal, E2B, Sprites, smolvm), Code Mode, sub-agents and planning, memory and skills, context compaction, guardrails and spend limits, web research and browsers, hosted SaaS integrations, step persistence, and background agents on Render Workflows. Use when the user mentions pydantic-ai-harness or pydantic_ai_harness, imports a harness capability …

Works with any agent that supports SKILL.md skills.

What this skill can do

Runs commands on your computer

This is disclosed by the author in the skill's SKILL.md or README. Expected for a coding skill.

Found in 4 places.

skills/pydantic-ai-harness/SKILL.md, line 49uv add "pydantic-ai-harness[coder,anthropic]"
skills/pydantic-ai-harness/SKILL.md, line 75uv add "pydantic-ai-harness[coder,modal,anthropic]"
skills/pydantic-ai-harness/SKILL.md, line 146uv add "pydantic-ai-harness[codemode,anthropic]"

Show 1 more

skills/pydantic-ai-harness/SKILL.md, line 219uv add pydantic-ai-harness

Connects to the internet

This is disclosed by the author in the skill's SKILL.md or README.

Found in 10 places.

skills/pydantic-ai-harness/SKILL.md, line 172from pydantic_ai.capabilities import LocalWorkspace, WebSearch
skills/pydantic-ai-harness/SKILL.md, line 182WebSearch(), # core
skills/pydantic-ai-harness/references/RESEARCH-AND-BROWSING.md, line 12| Search and read public pages; follow whatever the model's provider offers | Core `WebSearch(local=True)` + `WebFetch(local=True)` from `pydantic_ai.capabiliti

Show 7 more

skills/pydantic-ai-harness/references/RESEARCH-AND-BROWSING.md, line 20fetching is acceptable. `WebSearch()` and `WebFetch()` with no arguments are native-only and raise on
skills/pydantic-ai-harness/references/RESEARCH-AND-BROWSING.md, line 24Tool-name collisions: core `WebSearch` (its native tool on Anthropic models), `ExaSearch`, and `YouSearch` all expose a
skills/pydantic-ai-harness/references/RESEARCH-AND-BROWSING.md, line 27class also needs its own `id=`, since each carries a default one), or use `WebSearch(native=False, local=True)`
skills/pydantic-ai-harness/references/RESEARCH-AND-BROWSING.md, line 28(needs the `pydantic-ai-slim[duckduckgo]` extra) whose DuckDuckGo tool is `duckduckgo_search`. `Researcher` includes core `WebSearch`, so do not add
skills/pydantic-ai-harness/references/RESEARCH-AND-BROWSING.md, line 33native search; `get_page` stays), or pass `WebSearch(local=ExaSearch().web_search_tool())` to keep core
skills/pydantic-ai-harness/references/RESEARCH-AND-BROWSING.md, line 34`WebSearch`'s native options.
skills/pydantic-ai-harness/references/RESEARCH-AND-BROWSING.md, line 38A combined capability: default research instructions, `WebSearch(local=True)`, `WebFetch(local=True)`,

Downloads and installs other software

The author does not mention this.

Found in 3 places.

skills/pydantic-ai-harness/references/CODING-AND-WORKSPACES.md, line 117uvx --with "pydantic-ai-harness[coder]" clai -a pydantic_ai_harness.coder:coder_agent -m anthropic:claude-opus-5-5
skills/pydantic-ai-harness/references/RESEARCH-AND-BROWSING.md, line 76`uvx --with 'pydantic-ai-harness[researcher]' clai -a pydantic_ai_harness.researcher:researcher_agent -m <model>`.
skills/pydantic-ai-harness/references/RUNTIME-AND-EXTENSION.md, line 535`safeoutputs_add_comment` tool). Install extra dependencies with a workflow `steps:` `pip install --user`.

Safer alternatives

Low-risk skills in the same category (coding) that look related. Check that one does what you need.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'pydantic-ai-harness' ] || [ -L ~/.agents/skills/'pydantic-ai-harness' ]; then echo 'A skill folder named pydantic-ai-harness already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/stanfish06/skillquarium' "$d" && git -C "$d" checkout --quiet 'ced6c96bd67acccbf0280a5071e59a523c118c66' -- 'skills/pydantic-ai-harness' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/pydantic-ai-harness' ~/.agents/skills/'pydantic-ai-harness' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'pydantic-ai-harness' ~/.claude/skills/'pydantic-ai-harness' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history

Date	Version	Score
2026-11-13	`ced6c96`	79
2026-11-08	`f748ea9`	85