# Typed Boundaries

> Make package and I/O boundaries explicit with types.

- Skill: `idanmann10/typed-boundaries` (Agent Skill, multi-file: 5 files)
- Install (CLI): `npx skillmds@latest add idanmann10/typed-boundaries`
- Raw SKILL.md: https://api.skillmd.com/api/skills/idanmann10/typed-boundaries/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: idanmann10 (https://skillmd.com/u/idanmann10)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/idanmann10/typed-boundaries

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# Typed Boundaries

Use discriminated unions and readonly interfaces at boundaries. Convert unknown inputs at the edge.

## Steps

1. Identify the reusable situation.
2. Apply the behavior with local evidence.
3. Record whether it helped.

# Provenance

Seeded during Phase 0 from goal.md. Inspired by: local roadmap.