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framework-migration-legacy-modernize - Legacy system modernization using strangler fig pattern

Orchestrate legacy system modernization using strangler fig pattern to replace outdated components gradually while maintaining continuous business operations.

Tags

Updated: 2026-09-23

Capabilities

Typical Inputs

Typical Outputs

What this skill does

  • Analyze legacy codebase
  • Map dependencies and integrations
  • Assess business impact and risks
  • Establish characterization test coverage
  • Implement contract testing
  • Configure strangler fig infrastructure
  • Modernize components incrementally
  • Audit and harden security
  • Optimize system performance
  • Execute progressive traffic rollout
  • Decommission replaced legacy components
  • Generate system modernization documentation

Inputs

  • Legacy codebase
  • System constraints and goals
  • Implementation playbook

Outputs

  • Modernization readiness and risk report
  • Dependency map and integration catalog
  • Characterization and contract test suites
  • API gateway configuration and feature flags
  • Modernized application components
  • Security audit and performance reports
  • Decommissioning checklist and migration documentation

Requirements

  • Task tool with subagent support
  • Access to legacy codebase

Source

  • Spec: SKILL.md

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legacy-code
modernization
strangler-fig
refactoring
architecture
migration
Analyze legacy codebase
Map dependencies and integrations
Assess business impact and risks
Establish characterization test coverage
Legacy codebase
System constraints and goals
Implementation playbook
Modernization readiness and risk report
Dependency map and integration catalog
Characterization and contract test suites