# Legacy Modernization

> Modernize legacy systems without rewriting from scratch. Use strangler fig, facade, and strategic refactoring.

- **Type:** Skill
- **Install:** `agentstack add skill-sethdford-claude-skills-legacy-modernization`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [sethdford](https://agentstack.voostack.com/s/sethdford)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [sethdford](https://github.com/sethdford)
- **Source:** https://github.com/sethdford/claude-skills/tree/main/architect/decision-making/skills/legacy-modernization

## Install

```sh
agentstack add skill-sethdford-claude-skills-legacy-modernization
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Legacy Modernization

Modernize legacy systems incrementally using strangler fig pattern, facade layers, and strategic refactoring.

## Instructions

1. **Assessment**: Understand current system behavior, pain points
2. **Strangler Fig**: New services alongside old monolith; gradually redirect traffic
3. **Facade Layer**: Wrap legacy with modern API without changing internals
4. **Refactoring**: Extract modules one at a time to modern stack
5. **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](https://github.com/sethdford)
- **Source:** [sethdford/claude-skills](https://github.com/sethdford/claude-skills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-sethdford-claude-skills-legacy-modernization
- Seller: https://agentstack.voostack.com/s/sethdford
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.