Evolving The Data Model
TriliumNext/Trilium
A skill your agent uses when adding a DB migration or a new column/field to a Becca entity in Trilium ("add a migration", "new column on notes/attributes", "ALTER TABLE", "add a field to…
Write safe, reversible database migrations for this repo's conventions.
Install Migration Writer
$ npx skills add Archive228/loopkit --skill migration-writer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Archive228/loopkit migration-writer --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/Archive228/loopkit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/migration-writer .claude/skills/migration-writer && 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 "migration-writer" agent skill from https://github.com/Archive228/loopkit/tree/main/skills/migration-writer into .claude/skills/migration-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-writer", 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/Archive228/loopkit/tree/main/skills/migration-writerType 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 Archive228/loopkit --skill migration-writer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Archive228/loopkit migration-writer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Archive228/loopkit.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/migration-writer .agents/skills/migration-writer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "migration-writer" agent skill from https://github.com/Archive228/loopkit/tree/main/skills/migration-writer into .agents/skills/migration-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-writer", 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 Archive228/loopkit --skill migration-writer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Archive228/loopkit migration-writer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Archive228/loopkit.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/migration-writer .cursor/skills/migration-writer && 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 "migration-writer" agent skill from https://github.com/Archive228/loopkit/tree/main/skills/migration-writer into .cursor/skills/migration-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-writer", 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/Archive228/loopkit.git --path skills/migration-writer--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 Archive228/loopkit --skill migration-writer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Archive228/loopkit migration-writer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Archive228/loopkit.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/migration-writer .gemini/skills/migration-writer && 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 "migration-writer" agent skill from https://github.com/Archive228/loopkit/tree/main/skills/migration-writer into .gemini/skills/migration-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-writer", 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 Archive228/loopkit migration-writerInstalls 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 Archive228/loopkit --skill migration-writer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Archive228/loopkit.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/migration-writer .github/skills/migration-writer && 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 "migration-writer" agent skill from https://github.com/Archive228/loopkit/tree/main/skills/migration-writer into .github/skills/migration-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-writer", 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 Archive228/loopkit --skill migration-writer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Archive228/loopkit migration-writer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Archive228/loopkit.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/migration-writer .opencode/skills/migration-writer && 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 "migration-writer" agent skill from https://github.com/Archive228/loopkit/tree/main/skills/migration-writer into .opencode/skills/migration-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-writer", 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
migration-writer- GitHub stars
- 756
- Token cost
- ~204 tokens
- SKILL.md length
- 97 words
- Files
- 1
- Skills in repo
- 43
- Repo updated
- First seen
- Licence
- MIT
At a glance
Write safe, reversible database migrations for this repo's conventions.
- Works in 5 steps: Read the current schema first. Match the… → Write BOTH up and down. A migration you… → Live-safe: on a hot table, adding a NOT… → …
- Any schema change
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Tasks that involve Database migrations
What it does
Migration Writer is an agent skill from Archive228/loopkit. Write safe, reversible database migrations for this repo's conventions. Use for any schema change.
Its SKILL.md is about 200 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Databases, covering Database migrations. The repository describes itself as: 33 battle-tested skills + minimal .claude harness for any coding agent (Claude Code, Cursor, Codex, Gemini CLI). The licence is MIT.
When your agent uses it
- Any schema change
- Tasks that involve Database migrations
Example prompts
- “/migration-writer”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Read the current schema first. Match the repo's migration tool and naming (NNN__).
- Write BOTH up and down. A migration you can't reverse is a migration you can't deploy safely.
- Live-safe: on a hot table, adding a NOT NULL column with no default, or an index without CONCURRENTLY, takes a blocking lock. Split into…
- Backfill large tables in batches, not one statement.
- Never edit an already-merged migration — add a new one.
What it can do on your machine
Read from SKILL.md and the folder at commit 5ae033e. 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
Migration Writer loads about 204 tokens when it runs. Until then it costs about 29 tokens; SKILL.md has 97 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 Archive228/loopkit at commit 5ae033e, republished under its MIT licence (© Archive228). 97 words, ~204 tokens.
Download SKILL.mdSave it as
.claude/skills/migration-writer/SKILL.md (or your agent's skills folder).- name
- migration-writer
- description
- Write safe, reversible database migrations for this repo's conventions. Use for any schema change.
- when_to_use
- add/alter a table, column, index, or constraint
Migration Writer
- Read the current schema first. Match the repo's migration tool and naming (
NNN_<verb>_<noun>). - Write BOTH up and down. A migration you can't reverse is a migration you can't deploy safely.
- Live-safe: on a hot table, adding a NOT NULL column with no default, or an index without CONCURRENTLY, takes a blocking lock. Split into steps: add nullable → backfill → add constraint.
- Backfill large tables in batches, not one statement.
- Never edit an already-merged migration — add a new one. Test with a dry-run before committing. Output the migration + the exact deploy order.
© Archive228, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/migration-writer of Archive228/loopkit.
Open the folder on GitHubat commit 5ae033e
Compare with similar skills
Migration Writer 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 |
|---|---|---|---|---|---|---|
| Migration Writer this skillArchive228/loopkit | 756 | — | ~204 | Automated safety check: Pass | MIT | |
| Evolving The Data ModelTriliumNext/Trilium | 38k | — | ~2.1k | Automated safety check: Pass | AGPL-3.0 | |
| Creating Database MigrationsNangoHQ/nango | 13k | — | ~449 | Automated safety check: Pass | Custom licence | |
| Openwrt Package UpdateNethServer/nethsecurity | 191 | — | ~841 | Automated safety check: Pass | Custom licence | |
| Free Willsyahiidkamil/Software-Engineer-AI-Agent-Atlas | 401 | — | ~3.4k | Automated safety check: Pass | None | |
| Ecto Migrationsoperately/operately | 577 | — | ~1.2k | Automated safety check: Pass | Custom licence |
Similar skills
Creating Database Migrations
NangoHQ/nango
A skill your agent uses when adding or editing Nango database migrations - covers migration directory selection, timestamped .cjs naming, matching recent migration style, down migration decisions…
Openwrt Package Update
NethServer/nethsecurity
A skill your agent uses when updating any forked OpenWrt package in a NethSecurity workspace from the upstream openwrt/packages feed.
Free Will
syahiidkamil/Software-Engineer-AI-Agent-Atlas
Deliberate-choice procedure for a medium-to-high-stakes engineering fork — when the first plausible solution (the instinct, the default next-token pull) would be costly to get wrong.
Ecto Migrations
operately/operately
Rules for Operately schema migrations (app/priv/repo/migrations/) and data migrations (app/lib/operately/data/change.ex).
DB Migrate
simstudioai/sim
Author or review a Drizzle DB migration for zero-downtime safety — expand/contract phasing, backward-compatibility with the deployed app version, and writing the -- migration-safe acknowledgment the…
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Related
Categories
Questions about Migration Writer
What does Migration Writer do?
Write safe, reversible database migrations for this repo's conventions. Migration Writer is an agent skill from Archive228/loopkit. Write safe, reversible database migrations for this repo's conventions.
When should I use Migration Writer?
Migration Writer fits situations like: any schema change; tasks that involve Database migrations.
How do I install Migration Writer in Claude Code?
Run `npx skills add Archive228/loopkit --skill migration-writer -a claude-code`. Or copy the skill folder (skills/migration-writer in Archive228/loopkit) into .claude/skills/migration-writer in your project. Claude Code loads it when a task matches its description.
How do I install Migration Writer in Codex?
Run `npx skills add Archive228/loopkit --skill migration-writer -a codex`. Or copy the skill folder (skills/migration-writer in Archive228/loopkit) into .agents/skills/migration-writer in your project. Codex loads it when a task matches its description.
Can I use Migration Writer 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 Archive228/loopkit --skill migration-writer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/migration-writer, .gemini/skills/migration-writer, .github/skills/migration-writer and .opencode/skills/migration-writer in your project.
What does Migration Writer need to run?
SKILL.md names no scripts, command-line tools or credentials: Migration Writer is instructions for the agent only.
Does Migration Writer 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 Migration Writer 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 Migration Writer use?
Migration Writer 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 Migration Writer use?
About 204 tokens (SKILL.md is roughly 816 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 Migration Writer?
Skills that share tags, products or a category with Migration Writer: Evolving The Data Model (TriliumNext/Trilium, 38k stars), Creating Database Migrations (NangoHQ/nango, 13k stars), Openwrt Package Update (NethServer/nethsecurity, 191 stars) and Free Will (syahiidkamil/Software-Engineer-AI-Agent-Atlas, 401 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Migration Writer?
Archive228 (a GitHub user) maintains it in Archive228/loopkit, which has 756 GitHub stars. The repository holds 43 skills in this directory. The repository was last updated on July 14, 2026.
Source: Archive228/loopkit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.