A PostgreSQL operations guide for safely running PostgreSQL, a database system used to store and query application data. It covers configuration, performance, backups, replication, upgrades, and incident diagnosis.

Use it to review settings, analyze indexes and query plans, manage vacuum and table bloat, verify backups and point-in-time recovery, operate replication, handle extensions, upgrade versions, and diagnose incidents.

It helps find database problems and plan risky operational work with evidence and rollback considerations. It also supports recovery and failover planning when a database becomes unavailable.

postgres — Skill for Claude Code and Codex by magnus919: A PostgreSQL operations guide for safely running PostgreSQL, a…

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/magnus919/agent-skills/postgres

Any agent

npx skills add magnus919/agent-skills --skill postgres

Clone the repo

git clone --depth 1 https://github.com/magnus919/agent-skills

Made for: Claude Code, Codex.

Its marketplace also offers this one on its own, as the plugin postgres — /plugin install postgres after adding the marketplace above.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/magnus919/agent-skills/postgres.svg)](https://agentmods.dev/skills/magnus919/agent-skills/postgres)

Your own site

<a href="https://agentmods.dev/skills/magnus919/agent-skills/postgres"><img src="https://agentmods.dev/badge/skills/magnus919/agent-skills/postgres.svg" alt="Measured on agentmods" height="20"></a>

Per session 107 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,654 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.

Model	Per session	Once invoked
Fable 5.1	$0.00107	$0.03654
Opus 5	$0.00053	$0.01827
Sonnet 5	$0.00021	$0.00731
Haiku 4.5	$0.00011	$0.00365

Measured 2d ago against content hash 006b67269046, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

postgres 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 2d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (tests/test_pgdiag.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

postgres/SKILL.md · 169 lines

How it starts

The opening of the file, as written. The whole thing — 169 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PostgreSQL Operations

Use this skill to operate PostgreSQL safely as the database engine it is: review configuration against workload, find index and query-plan problems, manage vacuum and bloat, set up and verify WAL archiving and point-in-time recovery, run replication with a defensible failover plan, handle extensions, plan major-version upgrades, and diagnose incidents with evidence. This is a tool skill for one named tool (PostgreSQL). Database methodology — backup strategy across engines, migration patterns, SQL analytical patterns — lives in data-engineering; application-level data access patterns belong to backend-engineering; schema and data modeling belong to data-architect and data-engineering. Supabase platform administration is supabase.

Operating contract

Read-only discovery before any mutation. Inspect configuration, catalog statistics, and logs first. The bundled pgdiag script collects read-only evidence and opens every session with default_transaction_read_only=on.
Confirm the target, scope, and rollback path before acting. Read-only discovery may proceed without confirmation. Mutations — a pg_ctl stop, a promotion, an extension install, a pg_upgrade run — require an explicit human directive naming the instance.
A backup is not recovery evidence. Verify restore on a scratch instance on a schedule; never claim recoverability from a backup log alone.
Keep evidence bounded. Summarize catalog queries and log excerpts; never dump full logs, postgresql.conf, or connection strings with passwords into chat.
Verify at the delivery boundary. A SELECT 1 answer proves connectivity, not health; a replayed pg_basebackup proves recoverability, not that today's WAL is being archived.

The pgdiag script

scripts/pgdiag is an agent-first, read-only diagnostic collector. It shells out to psql, opens every session with default_transaction_read_only=on, and emits bounded JSON. --help works with no server and no psql installed.

Read the full file on GitHub · 169 lines

Files

What ships with it

13 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.

2d ago First seen · 169 lines · 107 tokens per session scan A 006b67269046

Subscribe to this mod's changes

postgres is a skill published in the GitHub repository magnus919/agent-skills (67 stars, last pushed yesterday), licensed MIT. It adds 107 tokens to every session and 3,654 once invoked, about $0.0005 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 2026-09-03.

Databases DevOps and cloud LLM PostgreSQL agent-skills agentskills ai-agents automation

postgres

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

PostgreSQL Operations

Operating contract

The pgdiag script

What ships with it

What this file has done since we first saw it

Other skills, from other repositories

postgres-patterns

alembic-migration

postgresql-table-design

postgres-expert

sql-analyst

wisdom-index