# SC-063: MIGRATION.md Guide Exists for v3.x Users

> Covers: Migration Requirements — A MIGRATION.md guide for users of v3.x
> Type: Happy Path

## Given
- The repository has been updated to v4.0

## When
- The repository root is inspected for migration documentation

## Then
- A `MIGRATION.md` file exists at the repository root
- It documents how to update from v3.x to v4.0
- It covers: -cskill suffix removal, marketplace.json changes, SKILL.md restructuring, install.sh addition

## Verification Method

**Method**: CLI command

**Steps**:
1. Run: `test -f /Users/francylisboacharuto/agent-skill-creator/MIGRATION.md && echo "EXISTS" || echo "MISSING"`
2. Run: `grep -c "cskill\|marketplace.json\|install.sh\|v3\|v4\|migration" /Users/francylisboacharuto/agent-skill-creator/MIGRATION.md`

**Expected evidence**: `MIGRATION.md` exists. Contains references to -cskill removal, marketplace.json changes, and upgrade steps from v3.x to v4.0.