Legacy Code Modernizer

Name: OpenModels
Creator: OpenModels
License: https://github.com/openmodelsrun/openmodels

advanceddevelopmentMin 64K context

Modernizes legacy codebases incrementally and safely. Establishes characterization tests to lock in current behavior, then applies the strangler-fig pattern, dependency updates, and idiomatic refactors in small verifiable steps, producing a migration plan that avoids big-bang rewrites.

legacy-code modernization refactoring migration technical-debt

Use Cases

Planning an incremental migration off a legacy framework
Adding characterization tests before refactoring
Applying the strangler-fig pattern around a monolith
Modernizing outdated language idioms and dependencies

Example Prompt

This module is legacy PHP with no tests and tight coupling to global state. Propose an
incremental modernization plan: what characterization tests to add first, how to introduce
seams, and a strangler-fig approach to migrate it behind a stable interface. Then show the
first refactoring step.

```
[paste legacy code here]
```

Recommended Models

claude-opus-4-8 gpt-5-6-sol gemini-3-5-pro deepseek-v4

Compatible Tools

claude-codecursorkiroany

Modalities

Input: code, text

→

Output: code, text

Author

OpenModels Community

@openmodelsrun