magnus919_agent-skills/supabase/SKILL.md

name, description, license, compatibility, metadata

name	description	license	compatibility	metadata
supabase	Use this skill when developing applications with Supabase, running the Supabase CLI, designing migrations and RLS policies, testing database behavior, generating client types, deploying the official self-hosted Docker stack, or administering its Postgres, Auth, Storage, Realtime, Functions, API gateway, backups, upgrades, and security. Use it for managed and self-hosted projects. Do not use it for generic PostgreSQL work with no Supabase services or conventions.	MIT	Requires network access for documentation lookup. Local development requires the Supabase CLI and a Docker-compatible runtime; self-hosting requires Linux, Git, Docker Engine, and Docker Compose.	source research_checked https://supabase.com/docs 2026-07-16

Supabase

Treat Supabase as a Postgres-centered system with multiple independently versioned services, not as one opaque backend. The managed platform, CLI local stack, and official self-hosted Compose stack share concepts but are different operating environments. Identify which one the task targets before choosing commands.

Operating contract

1. Discover the target and current state before changing it: managed project, CLI local stack, or self-hosted Compose; CLI and service versions; project link; database and migration state; enabled services; public URLs; backup and rollback path.
2. Confirm target, scope, and rollback path before the first mutation. Read-only discovery may proceed without confirmation. An explicit user directive to deploy or change the named target satisfies this gate.
3. Keep publishable keys client-side and secret/service-role keys server-side only. Never print, commit, or place secret keys, database passwords, JWT signing material, SMTP credentials, or connection strings containing passwords in reports.
4. Make database changes through versioned migrations. Review generated diffs as drafts, replay the full chain, test RLS negative cases, and regenerate client types before deployment.
5. For self-hosting, use the official supabase/supabase Docker directory and its setup.sh, run.sh, update notes, and tests. Do not invent a reduced Compose stack unless the user explicitly wants one and accepts the lost capabilities.
6. Verify at the delivery boundary: container health is not API health; an API response is not authorization proof; a backup is not recovery evidence.

Choose the path

Need	Read first
Understand services, trust boundaries, keys, and environment differences	architecture and boundaries
Install/use the CLI, establish a local workflow, or operate managed Functions, secrets, branches, SSL enforcement, CIDR restrictions, and network bans	local development and CLI
Create schemas, migrations, seed data, RLS policies, tests, and generated types	database development and testing
Build with Auth, REST, Realtime, Storage, and Edge Functions	application services
Deploy or harden the official Docker stack	self-hosting deployment
Back up, restore, update, upgrade, monitor, or recover a self-hosted instance	administration and recovery
Diagnose unhealthy containers, bad URLs, auth failures, drift, or migration failures	troubleshooting
Check claim currency or authoritative source coverage	source index

First read-only discovery

supabase --version
supabase status --output json       # CLI local project; may fail when stopped
supabase migration list            # linked/local migration comparison when configured
docker compose config --quiet       # self-hosted project directory
docker compose ps --format json

For a managed project, also establish the project reference, linked status, target environment, and whether direct production changes have created drift. For self-hosting, inspect docker/CHANGELOG.md, docker/versions.md, the active COMPOSE_FILE, disk/memory headroom, and backup evidence before updates.

Development loop

Use one schema-authoring mode per project:

# Declarative: edit supabase/schemas/*.sql first
supabase db diff -f change-name

# Imperative: write the generated migration directly
supabase migration new change-name

# Both paths converge on the same checks
supabase db reset
supabase test db
supabase gen types --lang typescript --local > database.types.ts

Review every generated migration. db diff does not capture DML and has known gaps around policy renames, views, and some privileges. db reset is destructive to the local database but is the reproducibility proof: migrations in order, then seed data.

Before a linked deployment:

supabase migration list
supabase db push --dry-run
supabase db push

Never use db reset --linked or db push --include-seed against production. Pass --local or --linked explicitly when ambiguity could hit the wrong database; command defaults differ.

Self-hosted lifecycle

Use the checked-in official helper scripts from the deployment directory:

sh run.sh config
sh run.sh compose-config >/dev/null
docker compose config --quiet
sh run.sh start
sh run.sh status
sh tests/test-self-hosted.sh http://localhost:8000

Production requires real secrets, correct external URLs, TLS termination, WebSocket forwarding, protected database ports, SMTP/provider configuration as needed, backups, and restore tests. The official default stack exposes Kong on 8000, Kong TLS on 8443, and Supavisor on 5432/6543; bind or firewall them deliberately.

Verification matrix

Layer	Minimum evidence
Configuration	docker compose config --quiet; no placeholder secrets; URLs agree with proxy/auth callbacks
Runtime	Every required service is running and healthy; bounded logs show no current failure loop
Database	Expected Postgres version; migration history matches; representative query succeeds
API gateway	Studio auth boundary, Auth health, REST with correct key role, JWKS endpoint
Authorization	Positive and negative RLS tests as anon/authenticated users; service-role bypass never used as proof
Storage	Bucket/object upload, download, integrity, signed URL, and cleanup
Realtime	WebSocket subscription and database-change delivery, not just an HTTP route
Functions	Invoke a real function through /functions/v1; verify auth behavior and logs
Recovery	Independent logical/physical backup plus restore into a separate test target

Hard boundaries and gotchas

• The CLI local stack is development-only: default credentials, no TLS, and no production rate limiting. Do not expose it publicly.
• RLS must be enabled on every table in an exposed schema. A publishable key is safe in a client only when grants and RLS policies are correct. Test denial paths.
• Secret/service-role keys bypass RLS. They never belong in browser bundles, mobile apps, logs, examples, or chat output.
• API_EXTERNAL_URL includes /auth/v1 in the current self-hosted configuration. SITE_URL is the application landing URL, not necessarily the Supabase hostname.
• Update the Compose configuration as a tested release set. Pulling arbitrary latest images independently can create incompatible service combinations.
• Postgres 17 is the current default for new self-hosted deployments. Never point it at a Postgres 15 data directory. Preserve both database data and the db-config volume containing the pgsodium root key.
• docker compose down -v, reset.sh, remote reset, key regeneration, and migration-history repair can destroy data, access, or sessions. Treat them as separate confirmed operations with recovery evidence.
• Self-hosted feature parity is not managed-platform parity. Backups, availability, upgrades, abuse controls, SMTP, observability, and support are operator responsibilities.

Exit criteria

The task is complete only when the requested artifact or state exists and the relevant boundary has been exercised: a local project replays from migrations and passes tests; a deployment passes configuration, health, and service-level smoke tests; an update has rollback evidence and post-update checks; a backup has been restored into a separate target; and no secret material appears in committed or reported output.