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.
Migrate existing projects off @commandkit/legacy to modern CommandKit patterns.
MITAuto-check passed
Install Commandkit Legacy Migration
$ npx skills add neplexlabs/commandkit --skill commandkit-legacy-migration -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install neplexlabs/commandkit commandkit-legacy-migration --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/neplexlabs/commandkit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/commandkit-legacy-migration .claude/skills/commandkit-legacy-migration && 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 "commandkit-legacy-migration" agent skill from https://github.com/neplexlabs/commandkit/tree/main/skills/commandkit-legacy-migration into .claude/skills/commandkit-legacy-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "commandkit-legacy-migration", 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/neplexlabs/commandkit/tree/main/skills/commandkit-legacy-migrationType 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 neplexlabs/commandkit --skill commandkit-legacy-migration -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install neplexlabs/commandkit commandkit-legacy-migration --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/neplexlabs/commandkit.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/commandkit-legacy-migration .agents/skills/commandkit-legacy-migration && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "commandkit-legacy-migration" agent skill from https://github.com/neplexlabs/commandkit/tree/main/skills/commandkit-legacy-migration into .agents/skills/commandkit-legacy-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "commandkit-legacy-migration", 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 neplexlabs/commandkit --skill commandkit-legacy-migration -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install neplexlabs/commandkit commandkit-legacy-migration --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/neplexlabs/commandkit.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/commandkit-legacy-migration .cursor/skills/commandkit-legacy-migration && 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 "commandkit-legacy-migration" agent skill from https://github.com/neplexlabs/commandkit/tree/main/skills/commandkit-legacy-migration into .cursor/skills/commandkit-legacy-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "commandkit-legacy-migration", 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/neplexlabs/commandkit.git --path skills/commandkit-legacy-migration--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 neplexlabs/commandkit --skill commandkit-legacy-migration -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install neplexlabs/commandkit commandkit-legacy-migration --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/neplexlabs/commandkit.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/commandkit-legacy-migration .gemini/skills/commandkit-legacy-migration && 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 "commandkit-legacy-migration" agent skill from https://github.com/neplexlabs/commandkit/tree/main/skills/commandkit-legacy-migration into .gemini/skills/commandkit-legacy-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "commandkit-legacy-migration", 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 neplexlabs/commandkit commandkit-legacy-migrationInstalls 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 neplexlabs/commandkit --skill commandkit-legacy-migration -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/neplexlabs/commandkit.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/commandkit-legacy-migration .github/skills/commandkit-legacy-migration && 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 "commandkit-legacy-migration" agent skill from https://github.com/neplexlabs/commandkit/tree/main/skills/commandkit-legacy-migration into .github/skills/commandkit-legacy-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "commandkit-legacy-migration", 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 neplexlabs/commandkit --skill commandkit-legacy-migration -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install neplexlabs/commandkit commandkit-legacy-migration --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/neplexlabs/commandkit.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/commandkit-legacy-migration .opencode/skills/commandkit-legacy-migration && 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 "commandkit-legacy-migration" agent skill from https://github.com/neplexlabs/commandkit/tree/main/skills/commandkit-legacy-migration into .opencode/skills/commandkit-legacy-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "commandkit-legacy-migration", 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
commandkit-legacy-migration- GitHub stars
- 165
- Token cost
- ~415 tokens
- SKILL.md length
- 112 words
- Files
- 5 (incl. references)
- Skills in repo
- 13
- Repo updated
- First seen
- Licence
- MIT
At a glance
Migrate existing projects off @commandkit/legacy to modern CommandKit patterns.
- Works in 4 steps: Detect legacy dependencies and plugin… → Inventory parity requirements. → Migrate incrementally by domain/feature… → …
- SKILL.md covers Activation guidance, Required filesystem expectations, Execution workflow and Guardrails, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Commandkit Legacy Migration is an agent skill from neplexlabs/commandkit. Migrate existing projects off @commandkit/legacy to modern CommandKit patterns. This skill is migration-only and must not promote new legacy adoption.
Its SKILL.md is about 420 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including reference files (for example `README.md`, `references/00-filesystem-structure.md` and `references/01-legacy-plugin-detection.md`).
The repository describes itself as: The discord.js meta-framework with features such as AI-powered command handler, analytics, feature flags, and more. The licence is MIT.
Example prompts
- “/commandkit-legacy-migration”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Detect legacy dependencies and plugin usage.
- Inventory parity requirements.
- Migrate incrementally by domain/feature slices.
- Remove legacy() only after parity validation.
What it can do on your machine
Read from SKILL.md and the folder at commit d771e6b. 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
No scripts in the folder and no shell commands in SKILL.md.
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
Commandkit Legacy Migration loads about 415 tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 45 tokens; SKILL.md has 112 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); files beside SKILL.md are not scanned.
SKILL.md
The full file from neplexlabs/commandkit at commit d771e6b, republished under its MIT licence (© neplexlabs). 112 words, ~415 tokens.
Download SKILL.mdSave it as
.claude/skills/commandkit-legacy-migration/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- commandkit-legacy-migration
- description
- Migrate existing projects off @commandkit/legacy to modern CommandKit patterns. This skill is migration-only and must not promote new legacy adoption.
- version
- 1.2.0
- author
- neplextech
- emoji
- ♻️
- tags
- commandkit, legacy, migration, deprecation
CommandKit Legacy Migration
Activation guidance
Use only when legacy plugin usage already exists.
Required filesystem expectations
- legacy and modern structures may coexist during phased migration
- target end state uses
src/app/commands/**andsrc/app/events/**
Execution workflow
- Detect legacy dependencies and plugin usage.
- Inventory parity requirements.
- Migrate incrementally by domain/feature slices.
- Remove
legacy()only after parity validation.
Guardrails
- Never recommend new legacy adoption.
- Keep migration commits small and verifiable.
Reference index
| Name | Description |
|---|---|
references/00-filesystem-structure.md | Coexistence strategy and target modern structure. |
references/01-legacy-plugin-detection.md | How to identify legacy plugin and handler usage points. |
references/02-migration-plan-template.md | Stepwise migration plan template with safety checks. |
Tool index
| Name | Description |
|---|---|
N/A | This skill currently has no helper tool scripts. |
© neplexlabs, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 4 other files (references) in skills/commandkit-legacy-migration of neplexlabs/commandkit.
- SKILL.md
- README.md
- references/00-filesystem-structure.md
- references/01-legacy-plugin-detection.md
- references/02-migration-plan-template.md
Open the folder on GitHubat commit d771e6b
Compare with similar skills
Commandkit Legacy Migration 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 |
|---|---|---|---|---|---|---|
| Commandkit Legacy Migration this skillneplexlabs/commandkit | 165 | — | ~415 | Automated safety check: Pass | MIT | |
| Legacy ModernizerJeffallan/claude-skills | 12k | — | ~1.6k | Automated safety check: Pass | MIT | |
| Legacy Migration Plannertech-leads-club/agent-skills | 7k | — | ~1.8k | Automated safety check: Pass | CC-BY-4.0 | |
| AngularJS to Angular Migrationwshobson/agents | 40k | 11 repos | ~1.8k | Automated safety check: Pass | MIT | |
| Framework Migration Legacy Modernizeaiskillstore/marketplace | 430 | 7 repos | ~2.8k | Automated safety check: Pass | None | |
| Legacy ModernizerDokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI | 507 | — | ~769 | Automated safety check: Pass | Custom licence |
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AngularJS to Angular Migration
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Framework Migration Legacy Modernize
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Legacy Modernizer
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Refactor legacy codebases, migrate outdated frameworks, and implement gradual modernization.
React Modernization
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Upgrade React applications to latest versions, migrate from class components to hooks, and adopt concurrent features.
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Questions about Commandkit Legacy Migration
What does Commandkit Legacy Migration do?
Migrate existing projects off @commandkit/legacy to modern CommandKit patterns. Commandkit Legacy Migration is an agent skill from neplexlabs/commandkit. Migrate existing projects off @commandkit/legacy to modern CommandKit patterns.
How do I install Commandkit Legacy Migration in Claude Code?
Run `npx skills add neplexlabs/commandkit --skill commandkit-legacy-migration -a claude-code`. Or copy the skill folder (skills/commandkit-legacy-migration in neplexlabs/commandkit) into .claude/skills/commandkit-legacy-migration in your project. Claude Code loads it when a task matches its description.
How do I install Commandkit Legacy Migration in Codex?
Run `npx skills add neplexlabs/commandkit --skill commandkit-legacy-migration -a codex`. Or copy the skill folder (skills/commandkit-legacy-migration in neplexlabs/commandkit) into .agents/skills/commandkit-legacy-migration in your project. Codex loads it when a task matches its description.
Can I use Commandkit Legacy Migration 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 neplexlabs/commandkit --skill commandkit-legacy-migration -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/commandkit-legacy-migration, .gemini/skills/commandkit-legacy-migration, .github/skills/commandkit-legacy-migration and .opencode/skills/commandkit-legacy-migration in your project.
What does Commandkit Legacy Migration need to run?
SKILL.md names no scripts, command-line tools or credentials: Commandkit Legacy Migration is instructions for the agent only.
Does Commandkit Legacy Migration 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 Commandkit Legacy Migration 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. Review the folder before installing.
What licence does Commandkit Legacy Migration use?
Commandkit Legacy Migration is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Commandkit Legacy Migration use?
About 415 tokens (SKILL.md is roughly 1.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 871 tokens, read only when the agent opens those files.
What are the alternatives to Commandkit Legacy Migration?
Skills that share tags, products or a category with Commandkit Legacy Migration: Legacy Modernizer (Jeffallan/claude-skills, 12k stars), Legacy Migration Planner (tech-leads-club/agent-skills, 7k stars), AngularJS to Angular Migration (wshobson/agents, 40k stars) and Framework Migration Legacy Modernize (aiskillstore/marketplace, 430 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Commandkit Legacy Migration?
neplexlabs (a GitHub organization) maintains it in neplexlabs/commandkit, which has 165 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on September 26, 2026.
Source: neplexlabs/commandkit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.