Legacy Modernization Pattern — Skills

Pattern: Legacy Modernization
Component: skills.md
Version: 1.3 | Updated: 2026-07-29

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Skill	Path	Why required
Architecture	skills/architecture.skill.md	Strangler seams and boundaries
Planning	skills/planning.skill.md	Incremental slices with behavior preservation
Testing	skills/testing.skill.md	Characterization and golden tests
Context	skills/context.skill.md	Legacy doc packs without noise

Related agents

• Architect agent
• Migration agent

Skill activation triggers

Run Architecture to own the strangler boundary before slicing. Run Characterization Testing before behavior-preserving moves. Run Planning for incremental ownership cuts. Run Context to pack legacy docs without drowning the model.

Verification that skills worked

• Characterization or golden tests cover the seam before rewrite slices
• Each slice names the strangler boundary owner
• Rewrite work never starts without a behavior-preservation gate

Changelog

• 1.3 (2026-07-29): Legacy Modernization skill activation and verification rewritten for this envelope.