# Invalid Side Effect

> Exercises detection of an implicitly invocable mutating skill.

- Skill: `shipshitdev/invalid-side-effect` (Agent Skill)
- Install (CLI): `npx skillmds@latest add shipshitdev/invalid-side-effect`
- Raw SKILL.md: https://api.skillmd.com/api/skills/shipshitdev/invalid-side-effect/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: shipshitdev (https://skillmd.com/u/shipshitdev)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/shipshitdev/invalid-side-effect

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# Invalid Side Effect Fixture

## Contract

Inputs:

- A target file

Outputs:

- Updated content

Creates/Modifies:

- The target file

External Side Effects:

- Local file writes

Confirmation Required:

- None

Delegates To:

- None