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 san-npm/skills-ws --skill postgres-masterygit clone --depth 1 https://github.com/san-npm/skills-wsWrote 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/san-npm/skills-ws/postgres-mastery)<a href="https://agentmods.dev/skills/san-npm/skills-ws/postgres-mastery"><img src="https://agentmods.dev/badge/skills/san-npm/skills-ws/postgres-mastery/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/san-npm/skills-ws/postgres-mastery"><img src="https://agentmods.dev/badge/skills/san-npm/skills-ws/postgres-mastery.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 | $0.00069 | $0.00468 |
| Opus 5.5 | $0.00028 | $0.00187 |
| Sonnet 5.5 | $0.00014 | $0.00094 |
| Haiku 4.5 | $0.00007 | $0.00047 |
Grade A, and why
postgres-mastery 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 2mo 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.
What it actually says
PostgreSQL Mastery
Production PostgreSQL patterns that go beyond CREATE INDEX. Index selection, query plan analysis, partitioning, pgvector for embeddings, zero-downtime migrations, and replication.
Reference guide
Read only the references needed for the current request:
- 1. Index Types — When to Use Each: references/1-index-types-when-to-use-each.md
- 2. EXPLAIN ANALYZE Deep Dive: references/2-explain-analyze-deep-dive.md
- 3. Partitioning: references/3-partitioning.md
- 4. pgvector — Embeddings & Similarity Search: references/4-pgvector-embeddings-similarity-search.md
- 5. Connection Pooling — PgBouncer: references/5-connection-pooling-pgbouncer.md
- 6. Zero-Downtime Migrations: references/6-zero-downtime-migrations.md
- 7. Backup & Recovery: references/7-backup-recovery.md
- 8. Replication: references/8-replication.md
- 9. Query Optimization Case Studies: references/9-query-optimization-case-studies.md
- 10. Essential Configuration: references/10-essential-configuration.md
What ships with it
11 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.
- agents/openai.yaml 181 B
- references/1-index-types-when-to-use-each.md 3.8 KB
- references/10-essential-configuration.md 1.9 KB
- references/2-explain-analyze-deep-dive.md 3.1 KB
- references/3-partitioning.md 4.2 KB
- references/4-pgvector-embeddings-similarity-search.md 4.9 KB
- references/5-connection-pooling-pgbouncer.md 3.7 KB
- references/6-zero-downtime-migrations.md 2.8 KB
- references/7-backup-recovery.md 4.8 KB
- references/8-replication.md 3.2 KB
- references/9-query-optimization-case-studies.md 2.2 KB
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.
- 2mo ago First seen · 25 lines · 69 tokens per session scan A 0f0724a0d72c
postgres-mastery is a skill published in the GitHub repository san-npm/skills-ws (4 stars, last pushed 1mo ago), licensed MIT. It adds 69 tokens to every session and 468 once invoked, about $0.0003 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 2026-08-31.
postgres-mastery compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| postgres-masterysan-npm/skills-ws | Skill | 4 | 1mo ago | MIT | A | 69 | Codex |
| alloydb-basicsgoogle/skills | Skill | 22k | yesterday | Apache-2.0 | A | 72 | Claude Code, Codex |
| postgresql-table-designwshobson/agents | Skill | 42k | yesterday | MIT | A | 37 | Claude Code |
| db-repairgarrytan/gbrain | Skill | 32k | yesterday | MIT | A | 96 | Claude Code |
| volcengine-rds-postgresqlbytedance/agentkit-samples | Skill | 484 | today | Apache-2.0 | A | 63 | Claude Code, Codex |
| dsqlawslabs/agent-plugins | Skill | 937 | yesterday | Apache-2.0 | A | 246 | Claude Code |
| analyzing-insights-across-teamsPostHog/posthog-foss | Skill | 728 | yesterday | MIT | A | 115 | Claude Code, Codex |