Reversible Migration
JuliusBrussee/caveman
Implement reversible compatibility-safe transitions. Use for schema, data, API, protocol, configuration, or dependency migrations requiring rollback and…
Convert LocalQuickFix or IntentionAction to the ModCommand API.
OfficialCustom licenceAuto-check passed
Install Modcommand Migration
$ npx skills add JetBrains/intellij-community --skill modcommand-migration -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install JetBrains/intellij-community modcommand-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/JetBrains/intellij-community.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/modcommand-migration .claude/skills/modcommand-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 "modcommand-migration" agent skill from https://github.com/JetBrains/intellij-community/tree/master/.agents/skills/modcommand-migration into .claude/skills/modcommand-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "modcommand-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/JetBrains/intellij-community/tree/master/.agents/skills/modcommand-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 JetBrains/intellij-community --skill modcommand-migration -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install JetBrains/intellij-community modcommand-migration --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/JetBrains/intellij-community.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/modcommand-migration .agents/skills/modcommand-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 "modcommand-migration" agent skill from https://github.com/JetBrains/intellij-community/tree/master/.agents/skills/modcommand-migration into .agents/skills/modcommand-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "modcommand-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 JetBrains/intellij-community --skill modcommand-migration -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install JetBrains/intellij-community modcommand-migration --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/JetBrains/intellij-community.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/modcommand-migration .cursor/skills/modcommand-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 "modcommand-migration" agent skill from https://github.com/JetBrains/intellij-community/tree/master/.agents/skills/modcommand-migration into .cursor/skills/modcommand-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "modcommand-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/JetBrains/intellij-community.git --path .agents/skills/modcommand-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 JetBrains/intellij-community --skill modcommand-migration -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install JetBrains/intellij-community modcommand-migration --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/JetBrains/intellij-community.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/modcommand-migration .gemini/skills/modcommand-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 "modcommand-migration" agent skill from https://github.com/JetBrains/intellij-community/tree/master/.agents/skills/modcommand-migration into .gemini/skills/modcommand-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "modcommand-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 JetBrains/intellij-community modcommand-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 JetBrains/intellij-community --skill modcommand-migration -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/JetBrains/intellij-community.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/modcommand-migration .github/skills/modcommand-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 "modcommand-migration" agent skill from https://github.com/JetBrains/intellij-community/tree/master/.agents/skills/modcommand-migration into .github/skills/modcommand-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "modcommand-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 JetBrains/intellij-community --skill modcommand-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 JetBrains/intellij-community modcommand-migration --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/JetBrains/intellij-community.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/modcommand-migration .opencode/skills/modcommand-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 "modcommand-migration" agent skill from https://github.com/JetBrains/intellij-community/tree/master/.agents/skills/modcommand-migration into .opencode/skills/modcommand-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "modcommand-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
modcommand-migration- GitHub stars
- 21k
- Token cost
- ~3.7k tokens
- SKILL.md length
- 1,610 words
- Files
- 4 (incl. references)
- Skills in repo
- 38
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Convert LocalQuickFix or IntentionAction to the ModCommand API.
- Works in 5 steps: Triage before you touch anything → Pick the target base class → Mechanical edits → …
- SKILL.md covers Step 1 — Triage before you…, Step 2 — Pick the target base…, Step 3 — Mechanical edits and Step 4 — Rules inside psiUpdate, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Modcommand Migration is an agent skill from JetBrains/intellij-community, published by the product's own GitHub organization. Convert LocalQuickFix or IntentionAction to the ModCommand API.
Its SKILL.md is about 3.7k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `references/capabilities.md`, `references/psi-updater.md` and `references/recipes.md`).
The repository describes itself as: IntelliJ IDEA & IntelliJ Platform.
Example prompts
- “/modcommand-migration”
Workflow steps
5 steps, taken from the step headings in SKILL.md.
- Triage before you touch anything
- Pick the target base class
- Mechanical edits
- Rules inside psiUpdate
- Find more candidates
What it can do on your machine
Read from SKILL.md and the folder at commit 562e3a2. 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 (its code samples are java).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
jetbrains.teamdocs.google.com
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
Modcommand Migration loads about 3.7k tokens when it runs, and up to ~11k if it reads all its reference files. Until then it costs about 21 tokens; SKILL.md has 1,610 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,610 words (~3,691 tokens).
“Two APIs coexist in this repo, and they are not two styles of the same thing — they have opposite execution models:”
- name
- modcommand-migration
Files
SKILL.md and 3 other files (references) in .agents/skills/modcommand-migration of JetBrains/intellij-community.
- SKILL.md
- references/capabilities.md
- references/psi-updater.md
- references/recipes.md
Open the folder on GitHubat commit 562e3a2
Compare with similar skills
Modcommand 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 |
|---|---|---|---|---|---|---|
| Modcommand Migration this skillJetBrains/intellij-community | 21k | — | ~3.7k | Automated safety check: Pass | Custom licence | |
| Reversible MigrationJuliusBrussee/caveman | 110k | 1 repos | ~196 | Automated safety check: Pass | Apache-2.0 | |
| Convertremotion-dev/remotion | 62k | — | ~247 | Automated safety check: Pass | Custom licence | |
| Database Migrationsaffaan-m/ECC | 275k | 4 repos | ~3k | Automated safety check: Pass | MIT | |
| Database Migrationsaffaan-m/ECC | 275k | 1 repos | ~2.4k | Automated safety check: Pass | MIT | |
| Safe Database Migration Patternsaffaan-m/ECC | 275k | — | ~3.3k | Automated safety check: Pass | MIT |
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affaan-m/ECC
Safe, reversible database migration patterns: forward-only production changes, expand-contract zero-downtime renames, concurrent indexes, batched backfills, and per-tool workflows for PostgreSQL…
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Şema değişiklikleri, veri migration'ları, rollback'ler ve PostgreSQL, MySQL ve yaygın ORM'ler (Prisma, Drizzle, Django, TypeORM, golang-migrate) arasında sıfır kesinti deployment'ları için…
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Questions about Modcommand Migration
What does Modcommand Migration do?
Convert LocalQuickFix or IntentionAction to the ModCommand API. Modcommand Migration is an agent skill from JetBrains/intellij-community, published by the product's own GitHub organization. Convert LocalQuickFix or IntentionAction to the ModCommand API.
How do I install Modcommand Migration in Claude Code?
Run `npx skills add JetBrains/intellij-community --skill modcommand-migration -a claude-code`. Or copy the skill folder (.agents/skills/modcommand-migration in JetBrains/intellij-community) into .claude/skills/modcommand-migration in your project. Claude Code loads it when a task matches its description.
How do I install Modcommand Migration in Codex?
Run `npx skills add JetBrains/intellij-community --skill modcommand-migration -a codex`. Or copy the skill folder (.agents/skills/modcommand-migration in JetBrains/intellij-community) into .agents/skills/modcommand-migration in your project. Codex loads it when a task matches its description.
Can I use Modcommand 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 JetBrains/intellij-community --skill modcommand-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/modcommand-migration, .gemini/skills/modcommand-migration, .github/skills/modcommand-migration and .opencode/skills/modcommand-migration in your project.
What does Modcommand Migration need to run?
SKILL.md names no scripts, command-line tools or credentials: Modcommand Migration is instructions for the agent only.
Does Modcommand Migration access the network?
SKILL.md names 2 domains. As links in the text: jetbrains.team and docs.google.com. This is read from the text; nothing was executed.
Is Modcommand 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 Modcommand Migration use?
Modcommand Migration 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 Modcommand Migration use?
About 3.7k tokens (SKILL.md is roughly 15k 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 7.3k tokens, read only when the agent opens those files.
What are the alternatives to Modcommand Migration?
Skills that share tags, products or a category with Modcommand Migration: Reversible Migration (JuliusBrussee/caveman, 110k stars), Convert (remotion-dev/remotion, 62k stars), Database Migrations (affaan-m/ECC, 275k stars) and Database Migrations (affaan-m/ECC, 275k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Modcommand Migration?
JetBrains (a GitHub organization, an official publisher) maintains it in JetBrains/intellij-community, which has 20,613 GitHub stars. The repository holds 38 skills in this directory. The repository was last updated on October 8, 2026.
Source: JetBrains/intellij-community on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.