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 ofershap/mcp-server-postgres --skill postgres-querygit clone --depth 1 https://github.com/ofershap/mcp-server-postgresWrote 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/ofershap/mcp-server-postgres/postgres-query)<a href="https://agentmods.dev/skills/ofershap/mcp-server-postgres/postgres-query"><img src="https://agentmods.dev/badge/skills/ofershap/mcp-server-postgres/postgres-query/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/ofershap/mcp-server-postgres/postgres-query"><img src="https://agentmods.dev/badge/skills/ofershap/mcp-server-postgres/postgres-query.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 | $0.00027 | $0.00549 |
| Opus 5.5 | $0.00011 | $0.00220 |
| Sonnet 5.5 | $0.00005 | $0.00110 |
| Haiku 4.5 | $0.00003 | $0.00055 |
Grade A, and why
postgres-query 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 1mo 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 — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.
PostgreSQL Query via MCP
Use this skill when you need to query PostgreSQL, inspect schemas, or optimize queries. Read-only by default for safety.
Available Tools
| Tool | What it does |
|---|---|
query |
Execute SQL (SELECT, WITH, EXPLAIN, SHOW, ANALYZE). Returns a text table. |
schema |
Tables in a schema with columns and approximate row counts |
table_info |
Detailed info for one table: columns, constraints, exact row count |
explain |
Run EXPLAIN (FORMAT TEXT), optionally EXPLAIN ANALYZE |
list_schemas |
List non-system schemas in the connected database |
Workflow
- Set
DATABASE_URLin MCP config (or passconnectionStringper tool call) list_schemasto see available schemasschemato understand tables inpublic(or another schema)table_infofor column-level detail on a specific tablequeryto run SELECT queries and inspect dataexplainto optimize slow queries
Key Patterns
- Read-only by default — only SELECT, WITH, EXPLAIN, SHOW, and ANALYZE are allowed
- Pass
readonly: falsein tool args to enable INSERT, UPDATE, DELETE, DDL schemauses cheap approximate counts;table_infouses exact COUNT(*)- Connection comes from
DATABASE_URLenv unless overridden per call
Safety
- Read-only mode is on by default — no accidental mutations
- Confirm with the user before enabling write mode (
readonly: false) - Use LIMIT in queries for large tables
explainwithanalyze: trueexecutes the query — use carefully on writes
When to use which tool
| Goal | Tool |
|---|---|
| Explore data | query with SELECT ... LIMIT |
| Understand database layout | schema first, then table_info for one table |
| Debug slow query | explain (analyze only when safe to run the query) |
| Find where tables live | list_schemas, then schema with schema name |
| One-off write / migration | query with readonly: false (confirm first) |
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.
- 1mo ago First seen · 52 lines · 27 tokens per session scan A 9e5be3892ea9
postgres-query is a skill published in the GitHub repository ofershap/mcp-server-postgres (0 stars, last pushed 2mo ago), licensed MIT. It adds 27 tokens to every session and 549 once invoked, about $0.0001 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.
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