Developer Device Platform Basics
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Provides guidance and instructions on managing remote devices on Developer Device Platform (DDP).
A skill your agent uses when adding, removing, or modifying columns, indexes, or tables in any Exposed table object (files under infrastructure/exposed/ ending in Table.kt).
Install Exposed Migration
$ npx skills add GerardPaligot/Confily --skill exposed-migration -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install GerardPaligot/Confily exposed-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/GerardPaligot/Confily.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.github/skills/exposed-migration .claude/skills/exposed-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 "exposed-migration" agent skill from https://github.com/GerardPaligot/Confily/tree/main/.github/skills/exposed-migration into .claude/skills/exposed-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exposed-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/GerardPaligot/Confily/tree/main/.github/skills/exposed-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 GerardPaligot/Confily --skill exposed-migration -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install GerardPaligot/Confily exposed-migration --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GerardPaligot/Confily.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.github/skills/exposed-migration .agents/skills/exposed-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 "exposed-migration" agent skill from https://github.com/GerardPaligot/Confily/tree/main/.github/skills/exposed-migration into .agents/skills/exposed-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exposed-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 GerardPaligot/Confily --skill exposed-migration -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install GerardPaligot/Confily exposed-migration --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GerardPaligot/Confily.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.github/skills/exposed-migration .cursor/skills/exposed-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 "exposed-migration" agent skill from https://github.com/GerardPaligot/Confily/tree/main/.github/skills/exposed-migration into .cursor/skills/exposed-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exposed-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/GerardPaligot/Confily.git --path .github/skills/exposed-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 GerardPaligot/Confily --skill exposed-migration -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install GerardPaligot/Confily exposed-migration --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GerardPaligot/Confily.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.github/skills/exposed-migration .gemini/skills/exposed-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 "exposed-migration" agent skill from https://github.com/GerardPaligot/Confily/tree/main/.github/skills/exposed-migration into .gemini/skills/exposed-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exposed-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 GerardPaligot/Confily exposed-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 GerardPaligot/Confily --skill exposed-migration -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/GerardPaligot/Confily.git skills-src && mkdir -p .github/skills && cp -r skills-src/.github/skills/exposed-migration .github/skills/exposed-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 "exposed-migration" agent skill from https://github.com/GerardPaligot/Confily/tree/main/.github/skills/exposed-migration into .github/skills/exposed-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exposed-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 GerardPaligot/Confily --skill exposed-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 GerardPaligot/Confily exposed-migration --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/GerardPaligot/Confily.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.github/skills/exposed-migration .opencode/skills/exposed-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 "exposed-migration" agent skill from https://github.com/GerardPaligot/Confily/tree/main/.github/skills/exposed-migration into .opencode/skills/exposed-migration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exposed-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
exposed-migration- GitHub stars
- 152
- Token cost
- ~1.3k tokens
- SKILL.md length
- 404 words
- Files
- 1
- Skills in repo
- 3
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
A skill your agent uses when adding, removing, or modifying columns, indexes, or tables in any Exposed table object (files under infrastructure/exposed/ ending in Table.kt).
- Works in 2 steps: Create the migration class → Register it in MigrationRegistry
- Modifying columns
- SKILL.md covers When a Migration Is Required, Project Infrastructure, How to Create a Migration and ID Convention, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Exposed Migration is an agent skill from GerardPaligot/Confily. Use this skill when adding, removing, or modifying columns, indexes, or tables in any Exposed table object (files under infrastructure/exposed/ ending in Table.kt). Explains when a migration is required, how to create one following the project convention, and how to register it so it runs automatically at startup.
Its SKILL.md is about 1.3k 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 Mobile. It works with Firebase, Google Cloud, Cloud Firestore and Android. The repository describes itself as: Real life Kotlin Multiplatform project with an iOS application developed in Swift with SwiftUI, an Android application developed in Kotlin with Jetpack Compose and a backend in… The licence is Apache-2.0.
When your agent uses it
- Modifying columns
- Tables in any Exposed table object (files under infrastructure/exposed/ ending in Table.kt)
Example prompts
- “/exposed-migration”
Workflow steps
2 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 61ad38f. 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 kotlin).
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
Exposed Migration loads about 1.3k tokens when it runs. Until then it costs about 83 tokens; SKILL.md has 404 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 GerardPaligot/Confily at commit 61ad38f, republished under its Apache-2.0 licence (© GerardPaligot). 404 words, ~1,251 tokens.
Download SKILL.mdSave it as
.claude/skills/exposed-migration/SKILL.md (or your agent's skills folder).- name
- exposed-migration
- description
- Use this skill when adding, removing, or modifying columns, indexes, or tables in any Exposed table object (files under infrastructure/exposed/ ending in Table.kt). Explains when a migration is required, how to create one following the project convention, and how to register it so it runs automatically at startup.
Exposed Migration Skill
When a Migration Is Required
A migration must be created whenever you change an Exposed table definition in a way that alters the existing database schema. SchemaUtils.create() only creates tables that do not exist yet — it never modifies existing ones.
| Change | Migration needed? |
|---|---|
Add a new Table object | No — SchemaUtils.create() handles it |
| Add a column to an existing table | Yes |
| Remove a column from an existing table | Yes (manual ALTER TABLE DROP COLUMN) |
| Change a column type or constraint | Yes |
| Add or remove an index on an existing table | Yes |
| Rename a column | Yes |
| Add a new nullable column with a default | Yes |
If you skip the migration, the new column/index will exist in code but not in the production database, causing runtime crashes on the next deployment.
Project Infrastructure
The migration system lives at:
backend/src/main/java/com/paligot/confily/backend/internals/infrastructure/exposed/migrations/
Migration.kt — interface every migration implements
MigrationsTable.kt — schema_migrations table that tracks what has been applied
MigrationManager.kt — runs pending migrations at startup, records applied ones
MigrationRegistry.kt — ordered list of all migrations
versions/ — one file per migrationDatabaseFactory.init() calls MigrationManager(MigrationRegistry.allMigrations).migrate(database) after SchemaUtils.create(). Each migration is run exactly once: its id is written to schema_migrations on success and skipped on all subsequent startups.
How to Create a Migration
1. Create the migration class
Add a new file in versions/ named after what the migration does:
// backend/.../migrations/versions/AddMyNewColumnMigration.kt
package com.paligot.confily.backend.internals.infrastructure.exposed.migrations.versions
import com.paligot.confily.backend.some.infrastructure.exposed.SomeTable
import com.paligot.confily.backend.internals.infrastructure.exposed.migrations.Migration
import org.jetbrains.exposed.sql.SchemaUtils
object AddMyNewColumnMigration : Migration {
override val id = "YYYYMMDD_add_my_new_column"
override val description = "Add <column_name> to <table_name> for <reason>"
override fun up() {
SchemaUtils.createMissingTablesAndColumns(SomeTable)
}
}2. Register it in MigrationRegistry
Open MigrationRegistry.kt and append the new migration at the end of allMigrations:
val allMigrations: List<Migration> = listOf(
// ... existing migrations ...
AddMyNewColumnMigration
)Do not reorder existing entries — migrations are applied in list order and each runs only once.
ID Convention
Use YYYYMMDD_short_snake_case_description, e.g.:
20260326_add_activities_external_provider20260401_add_partner_video_url
The id must be unique across all migrations and sortable chronologically. The MigrationManager sorts by id before applying, so the date prefix guarantees correct ordering.
Show full SKILL.md (154 more words)Show less
Patterns for Common Changes
Add nullable columns to an existing table
Just add the column to the table object and call SchemaUtils.createMissingTablesAndColumns:
override fun up() {
SchemaUtils.createMissingTablesAndColumns(TargetTable)
}Execute raw SQL (e.g. drop a column, add a partial index)
Use exec() inside a Transaction:
override fun up() {
exec("ALTER TABLE my_table DROP COLUMN IF EXISTS old_column")
}up() is always called inside an active transaction (from MigrationManager), so exec() is available directly.
Data migration
Perform data manipulation with Exposed DSL inside up():
override fun up() {
SchemaUtils.createMissingTablesAndColumns(TargetTable)
TargetTable.update {
it[newColumn] = "default_value"
}
}Rules
- Never modify an already-applied migration. Once an
idis inschema_migrations, that migration will never run again. Fix mistakes with a new migration. - Never reorder
MigrationRegistry.allMigrations. The list order controls application order for new databases. - Keep
up()idempotent where possible. UseIF NOT EXISTS,IF EXISTS, andcreateMissingTablesAndColumnsso re-runs on a partially migrated database are safe. - One logical change per migration. Small, focused migrations are easier to debug and roll forward.
- Always provide a meaningful
description. It appears in logs andschema_migrationsfor auditability.
© GerardPaligot, Apache-2.0. 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 .github/skills/exposed-migration of GerardPaligot/Confily.
Open the folder on GitHubat commit 61ad38f
Compare with similar skills
Exposed 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 |
|---|---|---|---|---|---|---|
| Exposed Migration this skillGerardPaligot/Confily | 152 | — | ~1.3k | Automated safety check: Pass | Apache-2.0 | |
| Developer Device Platform Basicsgoogle/skills | 21k | — | ~2.5k | Automated safety check: Pass | Apache-2.0 | |
| Firebase Messagingevanca/flutter-ai-rules | 650 | — | ~3.2k | Automated safety check: Pass | MIT | |
| Maui Push Notificationsdavidortinau/maui-skills | 175 | — | ~1.2k | Automated safety check: Pass | MIT | |
| Cometchat Flutter V6 Pushcometchat/cometchat-skills | 131 | — | ~1.4k | Automated safety check: Pass | MIT | |
| Cometchat React Native Pushcometchat/cometchat-skills | 131 | — | ~1.3k | Automated safety check: Pass | MIT |
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Questions about Exposed Migration
What does Exposed Migration do?
A skill your agent uses when adding, removing, or modifying columns, indexes, or tables in any Exposed table object (files under infrastructure/exposed/ ending in Table.kt). Exposed Migration is an agent skill from GerardPaligot/Confily.kt).
When should I use Exposed Migration?
Exposed Migration fits situations like: modifying columns; tables in any Exposed table object (files under infrastructure/exposed/ ending in Table.kt).
How do I install Exposed Migration in Claude Code?
Run `npx skills add GerardPaligot/Confily --skill exposed-migration -a claude-code`. Or copy the skill folder (.github/skills/exposed-migration in GerardPaligot/Confily) into .claude/skills/exposed-migration in your project. Claude Code loads it when a task matches its description.
How do I install Exposed Migration in Codex?
Run `npx skills add GerardPaligot/Confily --skill exposed-migration -a codex`. Or copy the skill folder (.github/skills/exposed-migration in GerardPaligot/Confily) into .agents/skills/exposed-migration in your project. Codex loads it when a task matches its description.
Can I use Exposed 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 GerardPaligot/Confily --skill exposed-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/exposed-migration, .gemini/skills/exposed-migration, .github/skills/exposed-migration and .opencode/skills/exposed-migration in your project.
What does Exposed Migration need to run?
SKILL.md names no scripts, command-line tools or credentials: Exposed Migration is instructions for the agent only.
Does Exposed 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 Exposed 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 Exposed Migration use?
Exposed Migration is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Exposed Migration use?
About 1.3k tokens (SKILL.md is roughly 5k 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 Exposed Migration?
Skills that share tags, products or a category with Exposed Migration: Developer Device Platform Basics (google/skills, 21k stars), Firebase Messaging (evanca/flutter-ai-rules, 650 stars), Maui Push Notifications (davidortinau/maui-skills, 175 stars) and Cometchat Flutter V6 Push (cometchat/cometchat-skills, 131 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Exposed Migration?
GerardPaligot (a GitHub user) maintains it in GerardPaligot/Confily, which has 152 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on September 27, 2026.
Source: GerardPaligot/Confily on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.