Legacy Modernization
Modernize legacy systems without rewriting from scratch. Use strangler fig, facade, and strategic refactoring.
Install
$ agentstack add skill-sethdford-claude-skills-legacy-modernization ✓ scanned · ✓ verified — works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
About
Legacy Modernization
Modernize legacy systems incrementally using strangler fig pattern, facade layers, and strategic refactoring.
Instructions
- Assessment: Understand current system behavior, pain points
- Strangler Fig: New services alongside old monolith; gradually redirect traffic
- Facade Layer: Wrap legacy with modern API without changing internals
- Refactoring: Extract modules one at a time to modern stack
- Incremental Value: Each phase delivers business value
Anti-Patterns
- Rewrite Everything: "Let's rebuild it right." Result: 2-3 years, misses market. Guard: Keep old system running while new builds alongside.
- No Business Alignment: Modernize things users don't care about. Guard: Modernize parts causing business pain first.
Further Reading
- Monolith to Microservices — specific modernization patterns
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: sethdford
- Source: sethdford/claude-skills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.