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Legacy code modernization subagent v1.0.0

Use this resource to plan the gradual modernization of a legacy system without interrupting production

New

  • 82 downloads
  • 32 likes
  • 188 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install legacy-migration-subagent

First time: connect the CLI with

npx --yes palatekit@latest login

The legacy-modernizer subagent is called to assess an existing system (code quality, technical debt, dependencies, security), then propose a step-by-step migration: strangler fig pattern, branch by abstraction, parallel service and database refactoring.

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Updated November 2, 2026

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Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • The subagent file (in English): role, checklist and migration strategies
  • A roadmap with priorities, risks and rollback paths

Good fit for

  • An application more than ten years old that cannot be rewritten at once
  • A team that wants to move off a shared database without downtime

Not for

    Tags

    • modernization
    • technical debt
    • migration
    • monolith

    About

    You say

    “Propose a roadmap to extract billing from our monolith without service interruption.”

    Card for “Legacy code modernization subagent”

    Subagent published by VoltAgent under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Copy the file into .claude/agents/ (project) or ~/.claude/agents/ (all your projects)
    2. Ask your agent to plan the gradual modernization of a legacy system without interrupting production, or call the subagent by name
    3. Review its work

    Content preview

    Files

    • legacy-migration-subagent.md6.9 KB
    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB

    Origin and licence

    Listed unmodified

    Author
    VoltAgent
    Source
    github.com/VoltAgent/awesome-claude-code-subagents/blob/f2e2ea7e0202cc05fa2d469fcb2c57fe08603450/categories/06-developer-experience/legacy-modernizer.md
    Licence
    MIT

    Notice

    « legacy-modernizer » (VoltAgent, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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