Extract Command from Git::Lib
ruby-git/ruby-git
Migrates a direct command call in Ruby Git's Git::Lib to a Git::Commands class, as part of a Strangler Fig redesign, with a plan, legacy tests and a pull request.
Refactor legacy codebases, migrate outdated frameworks, and implement gradual modernization.
Install Legacy Modernizer
$ npx skills add Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill legacy-modernizer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI legacy-modernizer --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agent/skills/legacy-modernizer .claude/skills/legacy-modernizer && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "legacy-modernizer" agent skill from https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI/tree/main/.agent/skills/legacy-modernizer into .claude/skills/legacy-modernizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "legacy-modernizer", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI/tree/main/.agent/skills/legacy-modernizerType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill legacy-modernizer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI legacy-modernizer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agent/skills/legacy-modernizer .agents/skills/legacy-modernizer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "legacy-modernizer" agent skill from https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI/tree/main/.agent/skills/legacy-modernizer into .agents/skills/legacy-modernizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "legacy-modernizer", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill legacy-modernizer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI legacy-modernizer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agent/skills/legacy-modernizer .cursor/skills/legacy-modernizer && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "legacy-modernizer" agent skill from https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI/tree/main/.agent/skills/legacy-modernizer into .cursor/skills/legacy-modernizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "legacy-modernizer", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI.git --path .agent/skills/legacy-modernizer--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill legacy-modernizer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI legacy-modernizer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agent/skills/legacy-modernizer .gemini/skills/legacy-modernizer && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "legacy-modernizer" agent skill from https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI/tree/main/.agent/skills/legacy-modernizer into .gemini/skills/legacy-modernizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "legacy-modernizer", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI legacy-modernizerInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill legacy-modernizer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agent/skills/legacy-modernizer .github/skills/legacy-modernizer && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "legacy-modernizer" agent skill from https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI/tree/main/.agent/skills/legacy-modernizer into .github/skills/legacy-modernizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "legacy-modernizer", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill legacy-modernizer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI legacy-modernizer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agent/skills/legacy-modernizer .opencode/skills/legacy-modernizer && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "legacy-modernizer" agent skill from https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI/tree/main/.agent/skills/legacy-modernizer into .opencode/skills/legacy-modernizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "legacy-modernizer", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
legacy-modernizer- GitHub stars
- 508
- Token cost
- ~769 tokens
- SKILL.md length
- 340 words
- Files
- 5 (incl. scripts)
- Skills in repo
- 27
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Refactor legacy codebases, migrate outdated frameworks, and implement gradual modernization.
- Works in 5 steps: Modernization Strategy (Strangler Fig) → Dependency & Version Upgrades → Code Migration & Refactoring → …
- Tasks that involve Legacy modernization
- SKILL.md covers 📑 Internal Menu, 1. Modernization Strategy…, 2. Dependency & Version Upgrades and 3. Code Migration & Refactoring, plus 4 more sections
- Runs JavaScript and Python scripts from its folder
What it does
Legacy Modernizer is an agent skill from Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI. Refactor legacy codebases, migrate outdated frameworks, and implement gradual modernization.
Its SKILL.md is about 770 tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including scripts (for example `resources/strangler_fig_pattern.md`, `scripts/refactor_suggestion.js` and `scripts/refactor_suggestion.py`).
It sits in Development, covering Legacy modernization, Refactoring and Code migrations.
When your agent uses it
- Tasks that involve Legacy modernization
- Tasks that involve Refactoring
- Tasks that involve Code migrations
Example prompts
- “/legacy-modernizer”
Requirements
- Python 3
- Node.js
Workflow steps
5 steps, taken from the step headings in SKILL.md.
- Modernization Strategy (Strangler Fig)
- Dependency & Version Upgrades
- Code Migration & Refactoring
- Framework Transitions
- Validation & Backward Compatibility
What it can do on your machine
Read from SKILL.md and the folder at commit c4a059b. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 2 files in scripts/ (JavaScript and Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Legacy Modernizer loads about 769 tokens when it runs. Until then it costs about 28 tokens; SKILL.md has 340 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 340 words (~769 tokens).
“You are a Principal Modernization Engineer and Software Strategist. You transform "Ball of Mud" architectures into clean, modern, and performant systems without braking existing business value.”
- name
- legacy-modernizer
- category
- development
- version
- 4.1.0-fractal
- layer
- master-skill
Files
SKILL.md and 4 other files (scripts) in .agent/skills/legacy-modernizer of Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI.
- SKILL.md
- resources/strangler_fig_pattern.md
- scripts/refactor_suggestion.js
- scripts/refactor_suggestion.py
- sub-skills/strangler_fig_pattern.md
Open the folder on GitHubat commit c4a059b
Compare with similar skills
Legacy Modernizer next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Legacy Modernizer this skillDokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI | 508 | — | ~769 | Automated safety check: Pass | Custom licence | |
| Extract Command from Git::Libruby-git/ruby-git | 1.8k | — | ~4.4k | Automated safety check: Pass | MIT | |
| Legacy ModernizerJeffallan/claude-skills | 12k | — | ~1.6k | Automated safety check: Pass | MIT | |
| Golang Modernizeaiskillstore/marketplace | 433 | 1 repos | ~3.3k | Automated safety check: Pass | MIT | |
| Migrate Core Code to Submodulestinyhumansai/openhuman | 42k | — | ~2.6k | Automated safety check: Pass | GPL-3.0 | |
| ast-grep Structural Searchcode-yeongyu/oh-my-openagent | 70k | — | ~3.3k | Automated safety check: Pass | MIT |
Similar skills
Legacy Modernizer
Jeffallan/claude-skills
Plans incremental migrations of aging systems with the strangler fig pattern, using dependency maps, rollback plans, characterization tests and gradual traffic shifts.
Golang Modernize
aiskillstore/marketplace
Modernize Golang code to use recent language features, standard library improvements, and idiomatic patterns.
Migrate Core Code to Submodules
tinyhumansai/openhuman
Plans and carries out moving non-host-specific code and its tests from the OpenHuman core into vendored tiny submodule libraries, then releases the submodule and re-pins the host.
ast-grep Structural Search
code-yeongyu/oh-my-openagent
Searches and rewrites code by syntax-tree shape across 25 languages with ast-grep, for codemods, structural queries and YAML lint rules, using a Python wrapper script.
Code Refactoring Workflow
luongnv89/claude-howto
Guides systematic, test-backed refactoring in the style of Martin Fowler, moving through research, planning and small incremental changes with your approval at each phase.
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Related
Categories
Questions about Legacy Modernizer
What does Legacy Modernizer do?
Refactor legacy codebases, migrate outdated frameworks, and implement gradual modernization. Legacy Modernizer is an agent skill from Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI. Refactor legacy codebases, migrate outdated frameworks, and implement gradual modernization.
When should I use Legacy Modernizer?
Legacy Modernizer fits situations like: tasks that involve Legacy modernization; tasks that involve Refactoring; tasks that involve Code migrations.
How do I install Legacy Modernizer in Claude Code?
Run `npx skills add Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill legacy-modernizer -a claude-code`. Or copy the skill folder (.agent/skills/legacy-modernizer in Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI) into .claude/skills/legacy-modernizer in your project. Claude Code loads it when a task matches its description.
How do I install Legacy Modernizer in Codex?
Run `npx skills add Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill legacy-modernizer -a codex`. Or copy the skill folder (.agent/skills/legacy-modernizer in Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI) into .agents/skills/legacy-modernizer in your project. Codex loads it when a task matches its description.
Can I use Legacy Modernizer in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill legacy-modernizer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/legacy-modernizer, .gemini/skills/legacy-modernizer, .github/skills/legacy-modernizer and .opencode/skills/legacy-modernizer in your project.
What does Legacy Modernizer need to run?
Going by SKILL.md and its folder, Legacy Modernizer needs JavaScript and Python for the scripts in its folder. Our summary lists: Python 3; Node.js.
Does Legacy Modernizer access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Legacy Modernizer safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Legacy Modernizer use?
Legacy Modernizer has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Legacy Modernizer use?
About 769 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Legacy Modernizer?
Skills that share tags, products or a category with Legacy Modernizer: Extract Command from Git::Lib (ruby-git/ruby-git, 1.8k stars), Legacy Modernizer (Jeffallan/claude-skills, 12k stars), Golang Modernize (aiskillstore/marketplace, 433 stars) and Migrate Core Code to Submodules (tinyhumansai/openhuman, 42k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Legacy Modernizer?
Dokhacgiakhoa (a GitHub user) maintains it in Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI, which has 508 GitHub stars. The repository holds 27 skills in this directory. The repository was last updated on June 11, 2026.
Source: Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.