Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add daffy0208/ai-dev-standards --skill supabase-developergit clone --depth 1 https://github.com/daffy0208/ai-dev-standardsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/daffy0208/ai-dev-standards/supabase-developer)<a href="https://agentmods.dev/skills/daffy0208/ai-dev-standards/supabase-developer"><img src="https://agentmods.dev/badge/skills/daffy0208/ai-dev-standards/supabase-developer/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/daffy0208/ai-dev-standards/supabase-developer"><img src="https://agentmods.dev/badge/skills/daffy0208/ai-dev-standards/supabase-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00049 | $0.08304 |
| Opus 5.5 | $0.00020 | $0.03322 |
| Sonnet 5.5 | $0.00010 | $0.01661 |
| Haiku 4.5 | $0.00005 | $0.00830 |
Grade A, and why
Supabase Developer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 1,471 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Supabase Developer
Build production-ready full-stack applications with Supabase.
Supabase is an open-source Firebase alternative providing PostgreSQL database, authentication, storage, real-time subscriptions, and edge functions. This skill guides you through building secure, scalable applications using Supabase's full feature set.
When to Use This Skill
- Authentication: Implementing user signup/login with email, OAuth, magic links, or phone auth
- Database: Designing PostgreSQL schemas with Row Level Security (RLS)
- Storage: Managing file uploads, downloads, and access control
- Real-time: Building live features with subscriptions and broadcasts
- Edge Functions: Serverless TypeScript functions at the edge
- Migrations: Managing database schema changes
- Integration: Connecting Next.js, React, Vue, or other frameworks
Core Supabase Concepts
1. Database (PostgreSQL)
Supabase uses PostgreSQL with extensions:
- PostgREST: Auto-generates REST API from schema
- pg_graphql: Optional GraphQL support
- Extensions: pgvector for embeddings, pg_cron for scheduled jobs
2. Authentication
Built-in auth with multiple providers:
- Email/password with confirmation
- Magic links (passwordless)
- OAuth (Google, GitHub, etc.)
- Phone/SMS authentication
- SAML SSO (enterprise)
3. Row Level Security (RLS)
PostgreSQL policies that enforce data access at the database level:
- User can only read their own data
- Admin can read all data
- Public read, authenticated write
4. Storage
S3-compatible object storage with RLS:
- Public and private buckets
- File size and type restrictions
- Image transformations on the fly
- CDN integration
5. Real-time
WebSocket-based subscriptions:
- Database changes (INSERT, UPDATE, DELETE)
- Broadcast messages to channels
- Presence tracking (who's online)
6. Edge Functions
Deno-based serverless functions:
- Deploy globally at the edge
- TypeScript/JavaScript runtime
- Background jobs and webhooks
- Custom API endpoints
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 1,471 lines · 49 tokens per session scan A 8ad191ee410e
Supabase Developer is a skill published in the GitHub repository daffy0208/ai-dev-standards (38 stars, last pushed 10mo ago), licensed MIT. It adds 49 tokens to every session and 8,304 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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