Framework Migration Legacy Modernize Agent Skill

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a comprehensive legacy system modernization using the strangler fig pattern, enabling gradual replacement of outdated components while maintaining continuous business operations through ex

3k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

505

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill framework-migration-legacy-modernize

What comes with it

9 176 bytes besides the instruction

sub-skills/1-comprehensive-legacy-system-analysis.md

sub-skills/1-legacy-code-test-coverage-analysis.md

sub-skills/1-legacy-component-decommissioning.md

sub-skills/1-performance-testing-and-optimization.md

sub-skills/1-strangler-fig-infrastructure-setup.md

sub-skills/2-component-modernization-first-wave.md

sub-skills/2-contract-testing-implementation.md

sub-skills/2-dependency-and-integration-mapping.md

sub-skills/2-documentation-and-knowledge-transfer.md

sub-skills/2-progressive-rollout-and-monitoring.md

sub-skills/3-business-impact-and-risk-assessment.md

sub-skills/3-security-hardening.md

sub-skills/3-test-data-management-strategy.md

The instruction itself

19 sections, as written by the author

Legacy Code Modernization Workflow

[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

Do not use this skill when

The task is unrelated to legacy code modernization workflow
You need a different domain or tool outside this scope

Instructions

Clarify goals, constraints, and required inputs.
Apply relevant best practices and validate outcomes.
Provide actionable steps and verification.
If detailed examples are required, open resources/implementation-playbook.md.

Phase 1: Legacy Assessment and Risk Analysis

🧠 Knowledge Modules (Fractal Skills)

1. 1. Comprehensive Legacy System Analysis

2. 2. Dependency and Integration Mapping

3. 3. Business Impact and Risk Assessment

4. 1. Legacy Code Test Coverage Analysis

5. 2. Contract Testing Implementation

6. 3. Test Data Management Strategy

7. 1. Strangler Fig Infrastructure Setup

8. 2. Component Modernization - First Wave

9. 3. Security Hardening

10. 1. Performance Testing and Optimization

11. 2. Progressive Rollout and Monitoring

12. 1. Legacy Component Decommissioning

13. 2. Documentation and Knowledge Transfer

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How to use it

Copy the folder

Take dokhacgiakhoa/framework-migration-legacy-modernize from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.