Borrowing it
Nothing to install: this file belongs to sbamin/pgmcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/sbamin/pgmcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/sbamin/pgmcpWrote 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/instructions/sbamin/pgmcp/claude-md)<a href="https://agentmods.dev/instructions/sbamin/pgmcp/claude-md"><img src="https://agentmods.dev/badge/instructions/sbamin/pgmcp/claude-md/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/instructions/sbamin/pgmcp/claude-md"><img src="https://agentmods.dev/badge/instructions/sbamin/pgmcp/claude-md.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 | $0.00409 | $0.00409 |
| Opus 5.5 | $0.00164 | $0.00164 |
| Sonnet 5.5 | $0.00082 | $0.00082 |
| Haiku 4.5 | $0.00041 | $0.00041 |
Grade A, and why
pgmcp CLAUDE.md 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.
What it actually says
pgmcp
A read-only MCP server exposing a PostgreSQL database as a guarded SQL query gateway.
Read first
CONTEXT.md— glossary. Key point: "read-only" is layered; the server connects aspgmcp_ro, which is notpg_read_all_data.SETUP.md— setup runbook, database-first.docs/adr/0001..0006— the decisions and why. Supersede an ADR explicitly rather than silently reversing it.
Invariants — never regress these
- Grants are the security boundary.
pgmcp_rohas no write grants and is never a member ofpg_read_all_data. The AST guard and READ ONLY transaction are defense-in-depth, not the boundary. - Reject multi-statement SQL. The
COMMIT; DROP …payload that escaped a READ ONLY envelope in a reference Postgres MCP server is an explicit test case. - Sensitive columns: expose them only through
curatedviews that omit them; never grant the sensitive base tables. - Network: the server binds loopback; the reverse proxy is the only listener,
with
Origin/Hostvalidated. - Prefer
uv pip installunder a local.venv/.
Config is the single source of truth
PGMCP_ALLOWED_SCHEMAS must mirror the grants in db/03_grants.sql. The guard,
cost gate, and introspection all read the allowlist from SETTINGS.
Build & test
- Role/view/grant DDL:
db/01_role.sql,db/02_curated_views.sql,db/03_grants.sql. - Tests:
pytest tests/(no DB needed);PGMCP_DSN=… pytest tests/test_live.pyfor the end-to-end corpus.
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 · 38 lines · 409 tokens per session scan A d28f71591f00
pgmcp CLAUDE.md is an instructions file published in the GitHub repository sbamin/pgmcp (1 stars, last pushed 3mo ago), licensed MIT. It adds 409 tokens to every session, about $0.0016 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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