Safe Database Migration Patterns
affaan-m/ECC
Rules and examples for safe, reversible schema changes in production: zero-downtime column and index changes, large data backfills and ORM migration workflows.
A skill your agent uses when changing how a v3 public API maps to v4, editing migration annotations, or regenerating migration/v3-to-v4.md.
MITAuto-check passed
Install Migration Guidance
$ npx skills add foldkit/foldkit --skill migration-guidance -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install foldkit/foldkit migration-guidance --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/foldkit/foldkit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/repos/effect/.agents/skills/migration-guidance .claude/skills/migration-guidance && 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-guidance" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/migration-guidance into .claude/skills/migration-guidance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-guidance", 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/foldkit/foldkit/tree/main/repos/effect/.agents/skills/migration-guidanceType 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 foldkit/foldkit --skill migration-guidance -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install foldkit/foldkit migration-guidance --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/foldkit/foldkit.git skills-src && mkdir -p .agents/skills && cp -r skills-src/repos/effect/.agents/skills/migration-guidance .agents/skills/migration-guidance && 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-guidance" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/migration-guidance into .agents/skills/migration-guidance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-guidance", 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 foldkit/foldkit --skill migration-guidance -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install foldkit/foldkit migration-guidance --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/foldkit/foldkit.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/repos/effect/.agents/skills/migration-guidance .cursor/skills/migration-guidance && 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-guidance" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/migration-guidance into .cursor/skills/migration-guidance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-guidance", 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/foldkit/foldkit.git --path repos/effect/.agents/skills/migration-guidance--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 foldkit/foldkit --skill migration-guidance -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install foldkit/foldkit migration-guidance --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/foldkit/foldkit.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/repos/effect/.agents/skills/migration-guidance .gemini/skills/migration-guidance && 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-guidance" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/migration-guidance into .gemini/skills/migration-guidance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-guidance", 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 foldkit/foldkit migration-guidanceInstalls 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 foldkit/foldkit --skill migration-guidance -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/foldkit/foldkit.git skills-src && mkdir -p .github/skills && cp -r skills-src/repos/effect/.agents/skills/migration-guidance .github/skills/migration-guidance && 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-guidance" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/migration-guidance into .github/skills/migration-guidance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-guidance", 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 foldkit/foldkit --skill migration-guidance -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install foldkit/foldkit migration-guidance --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/foldkit/foldkit.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/repos/effect/.agents/skills/migration-guidance .opencode/skills/migration-guidance && 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-guidance" agent skill from https://github.com/foldkit/foldkit/tree/main/repos/effect/.agents/skills/migration-guidance into .opencode/skills/migration-guidance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migration-guidance", 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-guidance- GitHub stars
- 912
- Token cost
- ~283 tokens
- SKILL.md length
- 138 words
- Files
- 3
- Skills in repo
- 17
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when changing how a v3 public API maps to v4, editing migration annotations, or regenerating migration/v3-to-v4.md.
- Works in 4 steps: Account for every affected v3 symbol. → Read annotations.md before adding or… → When checking or regenerating the… → …
- Changing how a v3 public API maps to v4
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Editing migration annotations
What it does
Migration Guidance is an agent skill from foldkit/foldkit. Use when changing how a v3 public API maps to v4, editing migration annotations, or regenerating migration/v3-to-v4.md.
Its SKILL.md is about 280 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `annotations.md` and `generation.md`).
The licence is MIT.
When your agent uses it
- Changing how a v3 public API maps to v4
- Editing migration annotations
- Regenerating migration/v3-to-v4.md
Example prompts
- “/migration-guidance”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Account for every affected v3 symbol.
- Read annotations.md before adding or changing annotation
- When checking or regenerating the reference, or when the API change exists in
- When output was generated, inspect it for unrelated movement and stale refs.
What it can do on your machine
Read from SKILL.md and the folder at commit ffbbde1. 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 Guidance loads about 283 tokens when it runs. Until then it costs about 35 tokens; SKILL.md has 138 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 foldkit/foldkit at commit ffbbde1, republished under its MIT licence (© foldkit). 138 words, ~283 tokens.
Download SKILL.mdSave it as
.claude/skills/migration-guidance/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- migration-guidance
- description
- Use when changing how a v3 public API maps to v4, editing migration annotations, or regenerating migration/v3-to-v4.md.
Update guidance when a v3 public module or API is renamed, moved, removed, replaced, or gains a materially different v4 contract. A v4-only API without a v3 counterpart does not automatically need an annotation.
- Account for every affected v3 symbol.
- Read annotations.md before adding or changing annotation YAML. Verify every suggested replacement against implementation and tests.
- When checking or regenerating the reference, or when the API change exists in a committed ref, read generation.md. Otherwise report that generation is deferred.
- When output was generated, inspect it for unrelated movement and stale refs.
The task is complete when every affected v3 symbol is accounted for, annotation replacements are verified, checks and generation succeed when the change is in a committed ref, and every generated difference is explained. Report deferred checks explicitly for uncommitted API changes.
© foldkit, 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 2 other files in repos/effect/.agents/skills/migration-guidance of foldkit/foldkit.
- SKILL.md
- annotations.md
- generation.md
Open the folder on GitHubat commit ffbbde1
Compare with similar skills
Migration Guidance 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 Guidance this skillfoldkit/foldkit | 912 | — | ~283 | Automated safety check: Pass | MIT | |
| Safe Database Migration Patternsaffaan-m/ECC | 274k | — | ~3.3k | Automated safety check: Pass | MIT | |
| Database Migrationsaffaan-m/ECC | 274k | 4 repos | ~3k | Automated safety check: Pass | MIT | |
| Reversible MigrationJuliusBrussee/caveman | 110k | 1 repos | ~196 | Automated safety check: Pass | Apache-2.0 | |
| Database Migrationsaffaan-m/ECC | 274k | 1 repos | ~2.4k | Automated safety check: Pass | MIT | |
| Migrationkortix-ai/suna | 20k | — | ~1.2k | Automated safety check: Pass | Custom licence |
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Questions about Migration Guidance
What does Migration Guidance do?
A skill your agent uses when changing how a v3 public API maps to v4, editing migration annotations, or regenerating migration/v3-to-v4.md. Migration Guidance is an agent skill from foldkit/foldkit.md.
When should I use Migration Guidance?
Migration Guidance fits situations like: changing how a v3 public API maps to v4; editing migration annotations; regenerating migration/v3-to-v4.md.
How do I install Migration Guidance in Claude Code?
Run `npx skills add foldkit/foldkit --skill migration-guidance -a claude-code`. Or copy the skill folder (repos/effect/.agents/skills/migration-guidance in foldkit/foldkit) into .claude/skills/migration-guidance in your project. Claude Code loads it when a task matches its description.
How do I install Migration Guidance in Codex?
Run `npx skills add foldkit/foldkit --skill migration-guidance -a codex`. Or copy the skill folder (repos/effect/.agents/skills/migration-guidance in foldkit/foldkit) into .agents/skills/migration-guidance in your project. Codex loads it when a task matches its description.
Can I use Migration Guidance 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 foldkit/foldkit --skill migration-guidance -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-guidance, .gemini/skills/migration-guidance, .github/skills/migration-guidance and .opencode/skills/migration-guidance in your project.
What does Migration Guidance need to run?
SKILL.md names no scripts, command-line tools or credentials: Migration Guidance is instructions for the agent only.
Does Migration Guidance 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 Guidance 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 Guidance use?
Migration Guidance 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 Guidance use?
About 283 tokens (SKILL.md is roughly 1.1k 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 Migration Guidance?
Skills that share tags, products or a category with Migration Guidance: Safe Database Migration Patterns (affaan-m/ECC, 274k stars), Database Migrations (affaan-m/ECC, 274k stars), Reversible Migration (JuliusBrussee/caveman, 110k stars) and Database Migrations (affaan-m/ECC, 274k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Migration Guidance?
foldkit (a GitHub organization) maintains it in foldkit/foldkit, which has 912 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on October 7, 2026.
Source: foldkit/foldkit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.