---

name: migrate-to-skills description: | Convert legacy subagents, slash commands, and rules to the unified Agent Skills format. Use when migrating agent resources, consolidating legacy directories, or standardizing across Claude Code, Cursor, Copilot, Codex, and Open Code. disable-model-invocation: true argument-hint: <scope: all|subagents|commands|rules|path> allowed-tools: Read Write Edit Glob Grep Bash

Convert to Skills

Convert legacy agent resources to the unified Agent Skills format.

Workflow

Execute these phases in order. Always get user approval before making changes.

Phase 1: Discovery

Search for legacy resources. Run these searches immediately:

# Subagents
find . -path "*/.claude/agents/*.md" -o -path "*/.cursor/agents/*.md" -o -path "*/.codex/agents/*.md" 2>/dev/null

# Commands  
find . -path "*/.claude/commands/*.md" -o -path "*/.cursor/commands/*.md" -o -path "*/.codex/commands/*.md" 2>/dev/null

# Rules
find . -path "*/.claude/rules/*.md" -o -path "*/.cursor/rules/*.mdc" -o -path "*/.cursor/rules/*.md" 2>/dev/null

# Custom Prompts (Codex)
find . -path "*/.codex/prompts/*.md" 2>/dev/null

# AGENTS.md files
find . -name "AGENTS.md" 2>/dev/null

If $1 specifies a path, only scan that location.

Phase 2: Classification

Read each discovered file and classify it. Present findings as:

## Discovery Results

### Subagents (X found)
| File | Name | Recommended Action |
|------|------|-------------------|
| .claude/agents/reviewer.md | reviewer | Convert to skill |

### Commands (X found)
| File | Name | Recommended Action |
|------|------|-------------------|
| .claude/commands/test.md | test | Convert to skill |

### Rules (X found)
| File | Name | Type | Recommended Action |
|------|------|------|-------------------|
| .cursor/rules/style.mdc | style | always-apply | Import to CLAUDE.md |
| .cursor/rules/react.mdc | react | glob-scoped | Keep as rule |
| .claude/rules/security.md | security | knowledge | Convert to skill |

### Already Skills (No Action)
- .claude/skills/existing/ ✓

### Needs Manual Review
- [file]: [reason]

Rule classification logic:

• alwaysApply: true → Import to CLAUDE.md via @import
• Has globs pattern → Keep as rule (skills don't support glob activation)
• General knowledge → Convert to skill

Phase 3: Approval

Ask user:

"Found X resources to convert. Proceed with conversion? [Y/n/customize]"

If "customize": Let user select specific items or modify actions.

Phase 4: Conversion

For each approved conversion, apply the appropriate mapping:

Subagent → Skill:

• Add context: fork (required for subagent behavior)
• Simplify model names (see field-mappings.md)
• Keep allowed-tools
• Enhance description with trigger keywords

Command → Skill:

• Add disable-model-invocation: true
• Keep argument-hint
• Document $ARGUMENTS, $1, $2 usage

Rule → Skill (knowledge type only):

• Write description with auto-trigger keywords
• No disable-model-invocation (allow auto-activation)

Rule → CLAUDE.md (always-apply):

• Add @import path/to/rule.md to CLAUDE.md

Create skill structure:

.claude/skills/{name}/
├── SKILL.md
├── scripts/      # If original has executables
├── references/   # If original has docs
└── assets/       # If original has templates

Phase 5: Verification

After conversion, run:

# List created skills
ls -la .claude/skills/

# Verify frontmatter
for skill in .claude/skills/*/SKILL.md; do
  echo "=== $skill ===" && head -20 "$skill"
done

Present summary:

## Conversion Complete

### Created Skills
| Skill | Location | Source |
|-------|----------|--------|
| reviewer | .claude/skills/reviewer/ | .claude/agents/reviewer.md |

### Updated Files
- CLAUDE.md: Added 2 @import statements

### Verification
- [x] All skills have valid frontmatter
- [x] Names match directory names
- [x] No duplicate skills

Phase 6: Cleanup (Optional)

Ask user:

"Delete original files? [y/N/archive]"

• y: Delete originals
• N: Keep originals (default)
• archive: Move to .claude/archive/

Quick Reference

Key Conversion Rules

| Source Type | Target | Key Addition | |-------------|--------|--------------| | Subagent | Skill | context: fork | | Command | Skill | disable-model-invocation: true | | Rule (knowledge) | Skill | Trigger keywords in description | | Rule (always-apply) | CLAUDE.md | @import statement | | Rule (glob-scoped) | Keep as rule | No conversion needed |

Model Mapping

| Legacy | Skills | |--------|--------| | claude-opus-4-* | opus | | claude-sonnet-4-* | sonnet | | claude-3-5-haiku-* | haiku | | inherit / omitted | (omit) |

Tool Mapping

| Variations | Standard | |------------|----------| | read, ReadFile, file_read | Read | | write, WriteFile | Write | | bash, Terminal, Shell | Bash | | grep, Search | Grep | | glob, Find, list_files | Glob |

Reference Files

For detailed specifications, read these on-demand:

• references/spec-reference.md - Full Agent Skills specification
• references/field-mappings.md - Complete field conversion tables
• references/examples.md - Before/after conversion examples

Troubleshooting

| Issue | Solution | |-------|----------| | Skill not discovered | Check: name matches directory, valid YAML frontmatter | | Triggers too often | Add disable-model-invocation: true | | Doesn't auto-trigger | Remove disable-model-invocation, add keywords to description | | Subagent behavior changed | Ensure context: fork is present | | Hooks not working | Requires Claude Code 2.1+ |