Browse reusable Agent Skills, each with a clear purpose and practical guidance.
Migrate a downstream Open Mercato user codebase from 0.4.10 to 0.5.0. Executable companion to UPGRADE_NOTES.md — detects which codemod patterns are in use, applies them in place, typechecks, and reports what still needs human review. Triggers on "upgrade open-mercato to 0.5.0", "bump to 0.5.0", or "apply UPGRADE_NOTES migrations".
Design entities, relationships, and manage the migration lifecycle. Use when planning a data model, designing entities, choosing relationship patterns, adding cross-module references, or managing database migrations. Triggers on "design entity", "data model", "add entity", "database schema", "migration", "relationship", "many-to-many", "junction table", "foreign key", "jsonb", "add column".
Design System Guardian for Open Mercato. Use for frontend UI work, design-system compliance reviews, semantic token migration, hardcoded color or typography cleanup, DS-compliant page scaffolding, and common DS violations such as arbitrary text sizes, raw color classes, or missing shared states. Prefer this skill whenever you are building or reviewing Open Mercato UI.
Guide for safely ejecting and customizing core modules. Use when a developer needs to modify a core module's behavior beyond what UMES extensions support, wants to eject a module, or is considering whether to eject vs extend. Triggers on "eject", "customize module", "modify core module", "override module", "fork module", "change built-in", "should I eject".
Open Mercato app navigator. Use when a developer asks: "what should I do now?", "which skill should I use?", "where do I start?", "next steps?", "I'm lost", "what comes after X?", "how do I create/add/build Y?", "how do I extend module Z?", "how do I fix this error?", "where does X go?", "what's the sequence for a new module / feature / integration?". Covers both orientation (navigation mode) and technical how-to (knowledge mode).
Implement a specification (or specific phases of a spec) using coordinated subagents. Handles multi-phase spec implementation with unit tests, integration tests, documentation, and code-review compliance. Use when the user says "implement spec", "implement the spec", "implement phases", "build from spec", or "code the spec". Tracks progress by updating the spec with implementation status.
Build integration provider packages for the Open Mercato Integration Marketplace (payment, shipping, data-sync, webhook). Scaffolds the npm package, adapter, credentials, widget injection, webhook processing, health checks, i18n, tests. Triggers on "build integration", "add provider", "integrate with stripe/paypal/dhl".
Migrate custom module code from MikroORM v6 to v7. Fixes v7 type errors (FilterQuery, RequiredEntityData), replaces Knex raw queries with Kysely, migrates persistAndFlush/removeAndFlush, updates decorator imports. Triggers on "mikro-orm v7", "persistAndFlush deprecated", "knex to kysely".
Scaffold a new module from scratch with all required files and conventions. Use when creating a new module, adding a new entity with CRUD, or bootstrapping module features (API routes, backend pages, DI, ACL, events, search). Triggers on "create module", "new module", "scaffold module", "add module", "bootstrap module", "generate module".
Extend core modules using the Universal Module Extension System (UMES). Use when adding columns/fields/filters to existing tables/forms, enriching API responses, intercepting API routes, blocking/validating mutations, replacing UI components, injecting menu items, or reacting to domain events. Triggers on "extend", "add column to", "add field to", "inject into", "intercept", "enrich", "hook into", "customize", "override component", "add menu item", "react to event", "block mutation", "validate before save".