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 agentmods add skills/vosslab/vosslab-skills/postgresql-expertnpx skills add vosslab/vosslab-skills --skill postgresql-expertgit clone --depth 1 https://github.com/vosslab/vosslab-skillsWrote 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/vosslab/vosslab-skills/postgresql-expert)<a href="https://agentmods.dev/skills/vosslab/vosslab-skills/postgresql-expert"><img src="https://agentmods.dev/badge/skills/vosslab/vosslab-skills/postgresql-expert.svg" alt="Measured on agentmods" 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 | $0.00064 | $0.01064 |
| Opus 5 | $0.00032 | $0.00532 |
| Sonnet 5 | $0.00013 | $0.00213 |
| Haiku 4.5 | $0.00006 | $0.00106 |
Grade A, and why
postgresql-expert 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 5d 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 — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.
PostgreSQL expert
Overview
Use this skill to make PostgreSQL changes from a stated workload, data model, and operational constraint. Start with the query, schema, cluster role, or recovery objective that the user needs to improve, then gather measured evidence before choosing a database change.
Keep application contracts, database schema, migration, query, and operations concerns explicit. Choose PostgreSQL-native types, constraints, transactions, and indexes that fit the observed access pattern. Treat a replica, a backup, and a tested recovery procedure as separate capabilities.
Workflow
- Classify the PostgreSQL task and select its evidence route.
- Name the affected schema, query, migration, cluster, pooler, or recovery target.
- Consult references/topic_index.md for the current-documentation route and executable oracle.
- Read references/task_selection.md when the work crosses an application or front-end boundary.
- Detect the project shape and establish a database contract.
- Decide whether the target is an existing service or a greenfield database-backed project.
- Existing: inventory migrations, schema definitions, queries, connection settings, monitoring, backup jobs, and deployment runbooks before changing behavior.
- Greenfield: write the data model, invariants, transaction boundaries, access patterns, and recovery objective before selecting an ORM, pooler, or index set.
- Read references/project_workflow.md for both project shapes.
- Capture a baseline that represents the workload.
- Reproduce the relevant query, write path, maintenance symptom, or recovery procedure with representative data and a recorded environment.
- Capture
EXPLAIN (ANALYZE, BUFFERS)before plan-affecting schema, statistics, or index changes. - Inspect transaction age, locks, table and index growth, replication state, or backup artifacts when the task concerns cluster operations.
What ships with it
7 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.
- 5d ago First seen · 91 lines · 64 tokens per session scan A 8b4be92d693a
postgresql-expert is a skill published in the GitHub repository vosslab/vosslab-skills (2 stars, last pushed 10d ago), licensed MIT. It adds 64 tokens to every session and 1,064 once invoked, about $0.0003 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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