postgres

A read-only way to query PostgreSQL databases, which store application data in tables, and receive the results as compact YAML.

In plain words
What is it for?
Use it to view columns, sample rows, or run safe SELECT queries through named database profiles, containers, or connection strings.
Why use it?
It makes it easier to inspect table structures and data while blocking commands that change or delete database content.

Skill for Claude CodeCodex

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/eslider/2dph/postgres
Any agent
npx skills add eSlider/2dph --skill postgres
Clone the repo
git clone --depth 1 https://github.com/eSlider/2dph

Made for: Claude Code, Codex.

Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 375 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 $0.00041 $0.00375
Opus 5 $0.00020 $0.00187
Sonnet 5 $0.00008 $0.00075
Haiku 4.5 $0.00004 $0.00038

Measured yesterday against content hash 05da5fdc35cf, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 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.

skills/postgres/SKILL.md · 40 lines

What it actually says

postgres

bin/postgres/query.go wraps vendored scripts/db/psql-yq. Output is YAML (cheaper than psql ASCII, easy to slice with mikefarah/yq).

bin/postgres/query.go --profile onlyoffice -s document_asset   # column list
bin/postgres/query.go --profile onlyoffice -t task_result -l 20  # sample rows
bin/postgres/query.go --profile onlyoffice -c 'SELECT ...'     # query → YAML

Ad-hoc targets without a profile:

bin/postgres/query.go --container my-pg --db app -c 'SELECT 1'
bin/postgres/query.go --dsn 'postgres://user@host:5432/db' -c 'SELECT 1'

Profiles

Connection details live in $HOME/.config/brain/db-profiles.yml (mode 600), never in a project repo. A profile names either a container or a host; passwords are read from a separate password_env_file and never appear in argv.

Rules

  • Read-only. Any insert|update|delete|drop|truncate|alter|create|grant| revoke|vacuum|copy is rejected with exit 3. Do not work around it.
  • PII. Client CRM databases: aggregate and count freely; never copy names or addresses into chat, issues or docs.
  • Use -l to keep samples small. Twenty rows answer most questions.
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 · 40 lines · 41 tokens per session scan A 05da5fdc35cf

Subscribe to this mod's changes

postgres is a skill published in the GitHub repository eSlider/2dph (2 stars, last pushed 2d ago), licensed MIT. It adds 41 tokens to every session and 375 once invoked, about $0.0002 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 2026-08-31.

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