agentmods.dev

supabase-postgres-best-practices

A PostgreSQL performance and design guide maintained by Supabase. PostgreSQL is a relational database, and these recommendations cover queries, indexes, security rules, schemas, connections, and monitoring.

In plain words
What is it for?
Use it when writing SQL, designing tables, creating migrations, adding indexes, tuning queries, configuring connection pooling, or reviewing row-level security.
Why use it?
It helps prevent slow queries, unsafe row-level access rules, poor table designs, and connection-management problems.

Skill for Claude CodeCodex

2.6k 20d ago A scan 182 tokens original MIT
View the source file supabase/agent-skills
Install

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.

agentmods
npx agentmods add skills/supabase/agent-skills/supabase-postgres-best-practices
Any agent
npx skills add supabase/agent-skills --skill supabase-postgres-best-practices
Clone the repo
git clone --depth 1 https://github.com/supabase/agent-skills

Made for: Claude Code, Codex.

Per session 182 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 707 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00182 $0.00707
Opus 5 $0.00091 $0.00353
Sonnet 5 $0.00036 $0.00141
Haiku 4.5 $0.00018 $0.00071

Measured yesterday against content hash ad65e776f45e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

supabase-postgres-best-practices 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 yesterday.

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.

Origin

Copies of this mod

8 near-identical copies found in the catalogue:

skills/supabase-postgres-best-practices/SKILL.md · 65 lines

What it actually says

Supabase Postgres Best Practices

Comprehensive performance optimization guide for Postgres, maintained by Supabase. Contains rules across 8 categories, prioritized by impact to guide automated query optimization and schema design.

When to Apply

Reference these guidelines when:

  • Writing SQL queries or designing schemas
  • Implementing indexes or query optimization
  • Reviewing database performance issues
  • Configuring connection pooling or scaling
  • Optimizing for Postgres-specific features
  • Working with Row-Level Security (RLS)

Rule Categories by Priority

Priority Category Impact Prefix
1 Query Performance CRITICAL query-
2 Connection Management CRITICAL conn-
3 Security & RLS CRITICAL security-
4 Schema Design HIGH schema-
5 Concurrency & Locking MEDIUM-HIGH lock-
6 Data Access Patterns MEDIUM data-
7 Monitoring & Diagnostics LOW-MEDIUM monitor-
8 Advanced Features LOW advanced-

How to Use

Read individual rule files for detailed explanations and SQL examples:

references/query-missing-indexes.md
references/query-partial-indexes.md
references/_sections.md

Each rule file contains:

  • Brief explanation of why it matters
  • Incorrect SQL example with explanation
  • Correct SQL example with explanation
  • Optional EXPLAIN output or metrics
  • Additional context and references
  • Supabase-specific notes (when applicable)

References

Files

What ships with it

35 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.

Changes

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.

  1. yesterday First seen · 65 lines · 182 tokens per session scan A ad65e776f45e

Subscribe to this mod's changes

supabase-postgres-best-practices is a skill published in the GitHub repository supabase/agent-skills (2,562 stars, last pushed 20d ago), licensed MIT. It adds 182 tokens to every session and 707 once invoked, about $0.0009 per session on Opus 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 2026-08-30.

DatabasesSecurityWriting and docsaiai-agentsskillssupabase
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