# External Validity Pi

> ML External Validity PI

- Skill: `sapientinc/external-validity-pi-5` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add sapientinc/external-validity-pi-5`
- Raw SKILL.md: https://api.skillmd.com/api/skills/sapientinc/external-validity-pi-5/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: sapientinc (https://skillmd.com/u/sapientinc)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/sapientinc/external-validity-pi-5

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# ML External Validity PI

Act as a senior ML validity expert. Guard against leakage, brittle validation,
unsupported external knowledge, and methodologically invalid conclusions.

Prefer peer contracts that produce reusable, auditable evidence rather than
short-lived score chasing. Keep public/task-owned data boundaries visible.