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Skills framework-migration-legacy-modernize
📦
framework-migration-legacy-modernize
Content revision r2 Safe ⚙️ External commands
Modernize Legacy Systems Incrementally
Legacy modernization can disrupt critical operations and hide integration risks. This skill structures assessment, testing, incremental replacement, rollout, and decommissioning with measurable safeguards.
Supports: Claude Codex Code(CC)
Install with my Agent
Copy this request to your Agent. It includes the canonical Skill page and manifest.
Agent request
Review the Skillstore skill "framework-migration-legacy-modernize" from https://skillstore.io/skills/sickn33-framework-migration-legacy-modernize.md and its manifest at https://skillstore.io/api/skills/sickn33-framework-migration-legacy-modernize/manifest. Verify the artifact. You may proceed after verification, subject to the environment's own policy.Your Agent should still show its plan and request any confirmation required by the security policy.
Agent-readable resources
Use these links when an AI agent, crawler, or script needs clean context instead of reading the full page.
Test it
Using "framework-migration-legacy-modernize". Assess a monolithic billing service for incremental modernization.
Expected outcome:
Prioritize invoice rendering as a quick win, map database coupling, and add characterization tests before routing production traffic.
Using "framework-migration-legacy-modernize". Create a progressive rollout plan for a replacement API.
Expected outcome:
Route traffic through 5%, 25%, 50%, and 100% stages. Roll back when errors exceed 1% or latency doubles.
Using "framework-migration-legacy-modernize". Define decommissioning criteria for a replaced component.
Expected outcome:
Require 30 days at zero traffic, no remaining dependencies, archived documentation, updated pipelines, and approved data cleanup.
Security Audit
Safev5 • 7/23/2026 Open versioned report
The sole static finding is a false positive caused by Markdown backticks around a referenced file path. SKILL.md contains workflow instructions only, with no shell execution, executable code, prompt injection, or malicious intent.
1
Files scanned
141
Lines analyzed
0
Review items
0
False positives ignored
Risk Factors
⚙️ External commands (1)
No confirmed security findings were detected by the latest completed static and semantic audit. This does not prove the skill has no side effects.
Audited by: codex View Audit History →
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APA citation
sickn33. (2026). framework-migration-legacy-modernize security audit report (audit version 5) [Author version unspecified]. Skillstore. https://skillstore.io/skills/sickn33-framework-migration-legacy-modernize/audits/5BibTeX citation
@techreport{sickn33-sickn33-framework-migration-legacy-modernize-2026,
author = {sickn33},
title = {framework-migration-legacy-modernize security audit report (audit version 5)},
institution = {Skillstore},
year = {2026},
number = {5},
url = {https://skillstore.io/skills/sickn33-framework-migration-legacy-modernize/audits/5},
note = {Author version unspecified}
}CITATION.cff
cff-version: 1.2.0
message: "If you use this Skill, cite its author and this versioned security audit report."
title: "framework-migration-legacy-modernize security audit report (audit version 5)"
version: "unspecified"
type: report
authors:
- name: "sickn33"
date-released: "2026-07-23"
url: "https://skillstore.io/skills/sickn33-framework-migration-legacy-modernize/audits/5"
identifiers:
- type: other
value: "skillstore:sickn33-framework-migration-legacy-modernize:audit:5"
description: "Skillstore immutable audit report identifier"
Skillstore Score
Why this score Evidence Confidence: High 55
Architecture
85
Maintainability
87
Content
68
Community
83
Spec Compliance
What You Can Build
Build a modernization roadmap
Prioritize legacy components using technical debt, dependencies, business criticality, risk, and quick-win potential.
Establish migration safety tests
Plan characterization, contract, performance, and data consistency testing before component replacement.
Control a progressive rollout
Define traffic stages, monitoring, automatic rollback triggers, fallback mechanisms, and observation periods.
Try These Prompts
Assess a legacy system
Assess [system]. Identify technical debt, dependencies, business risks, quick wins, and missing information needed for modernization.
Design migration test coverage
Design testing for [components]. Include characterization tests, integration contracts, test data, performance baselines, and acceptance criteria.
Plan a strangler migration
Plan migration for [component]. Define routing, adapters, data consistency, feature flags, observability, rollback triggers, and phased traffic percentages.
Challenge an advanced migration plan
Evaluate [migration plan] against [constraints]. Rank failure modes, challenge assumptions, define automated gates, and specify evidence required for decommissioning.
Best Practices
- Capture current behavior with characterization and contract tests before replacing components.
- Define measurable rollback triggers and observe each rollout stage before increasing traffic.
- Retain legacy fallbacks until dependency, traffic, data consistency, and stability evidence support decommissioning.
Avoid
- Do not start implementation before mapping dependencies, business criticality, and shared data.
- Do not use dual writes without reconciliation monitoring and a documented recovery process.
- Do not decommission legacy components immediately after traffic reaches zero.
Frequently Asked Questions
What migration approach does this skill support?
It focuses on gradual replacement through the strangler fig pattern, while also presenting feature, database, API, and full-cutover options.
Can it perform a migration automatically?
No. It structures analysis and implementation work, but repository access, suitable tools, validation, and human approval remain necessary.
What inputs produce the best results?
Provide the target codebase, architecture, dependencies, business criticality, service levels, compliance needs, current tests, and production metrics.
Does it support full cutovers?
Yes. Full cutover is listed as an option, but it carries more risk than the default incremental approach.
How does the workflow reduce migration risk?
It establishes tests, baselines, routing controls, monitoring, fallback mechanisms, progressive traffic stages, and explicit rollback triggers.
When can a legacy component be decommissioned?
Decommission after 30 days at zero traffic, with dependencies removed, stability verified, documentation archived, and cleanup approved.
Developer Details
Author
sickn33License
MIT
Skillstore revision
r2
Version notice
The author did not declare a version.
Ref
88a8e9a07f4c54ab105c1c41b6267c287146b07b
Maintenance freshness
7/26/2026
Usage
7 downloads · 97 views
File structure
📄 SKILL.md
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