Framework Migration Legacy Modernize

This implements the strangler fig pattern for modernizing legacy codebases by orchestrating specialized agents across assessment, testing, migration, and security phases. You get a structured workflow that maps dependencies, establishes test coverage with characterization tests, sets up API gateway routing with feature flags, and gradually replaces old components while keeping both systems running. The approach is methodical, starting with risk analysis and quick wins before tackling complex refactoring. It's built for teams that can't afford big bang rewrites and need to maintain business operations during migration. The workflow assumes you have time to instrument things properly, so if you're under pressure to ship fast, the comprehensive testing and dual-system monitoring might feel heavy.

skills.sh installs: 216
GitHub stars: 39.4K
last updated: Jun 3, 2026

View on GitHub

Install

$ npx -y skills add sickn33/antigravity-awesome-skills --skill framework-migration-legacy-modernize --agent claude-code

Installs into .claude/skills of the current project.

Files

Legacy Code Modernization Workflow

Orchestrate a comprehensive legacy system modernization using the strangler fig pattern, enabling gradual replacement of outdated components while maintaining continuous business operations through expert agent coordination.

[Extended thinking: The strangler fig pattern, named after the tropical fig tree that gradually envelops and replaces its host, represents the gold standard for risk-managed legacy modernization. This workflow implements a systematic approach where new functionality gradually replaces legacy components, allowing both systems to coexist during transition. By orchestrating specialized agents for assessment, testing, security, and implementation, we ensure each migration phase is validated before proceeding, minimizing disruption while maximizing modernization velocity.]

Use this skill when

Working on legacy code modernization workflow tasks or workflows
Needing guidance, best practices, or checklists for legacy code modernization workflow