# Principle Boundary Discipline

> Validate and normalize at boundaries, trust internal invariants, and keep business logic free of adapter noise. Use when at parsing, framework, process, network, storage, or user-input boundaries.

- Skill: `theonlyfusioncube/principle-boundary-discipline` (Agent Skill)
- Install (CLI): `npx skillmds@latest add theonlyfusioncube/principle-boundary-discipline`
- Raw SKILL.md: https://api.skillmd.com/api/skills/theonlyfusioncube/principle-boundary-discipline/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: TheOnlyFusionCube (https://skillmd.com/u/theonlyfusioncube)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/theonlyfusioncube/principle-boundary-discipline

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# Boundary Discipline

## Trigger

At parsing, framework, process, network, storage, or user-input boundaries.

## Rule

Validate and normalize at boundaries, trust internal invariants, and keep business logic free of adapter noise.

## Application

1. Name the concrete decision this principle changes.
2. Apply the rule to that decision, not as a decorative citation.
3. Prefer evidence from the current repository/runtime over generic preference.
4. If the principle conflicts with an explicit user constraint, keep the constraint and state the tradeoff.