postgres-mcp: Instructions file for Claude Code

CLAUDE.md

postgres-mcp CLAUDE.md is an instructions file for Claude Code from mirenqinggege/postgres-mcp. It costs 1,101 tokens per session, scanned A, original, MIT.

A project instruction file for a PostgreSQL MCP server. PostgreSQL is a database system, and MCP is a way for AI tools to connect to software services.

In plain words
What is it for?
It helps install dependencies, run the database server, execute tests, format and check Python code, run type checks, build the package, and understand its database tools.
Why use it?
It gives an AI coding agent the project overview, setup commands, tests, checks, and architecture it needs to work in the repository.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is mirenqinggege/postgres-mcp's own configuration. It tells Claude Code how to work on postgres-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything postgres-mcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to mirenqinggege/postgres-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/mirenqinggege/postgres-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/mirenqinggege/postgres-mcp

Made for: Claude Code.

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When invoked 1,101 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.01101 $0.01101
Opus 5 $0.00550 $0.00550
Sonnet 5 $0.00220 $0.00220
Haiku 4.5 $0.00110 $0.00110

Measured 8d ago against content hash a8982cf91173, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

postgres-mcp 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 8d 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.

CLAUDE.md · 127 lines

How it starts

The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

项目概述

Postgres MCP Pro 是一个 PostgreSQL MCP (Model Context Protocol) 服务器,提供索引调优、执行计划分析、健康检查和安全 SQL 执行功能。

常用命令

开发设置

# 安装依赖
uv sync

# 运行服务器 (stdio 模式)
uv run postgres-mcp --access-mode=unrestricted

# 运行服务器 (SSE 模式)
uv run postgres-mcp --access-mode=unrestricted --transport=sse

# 运行服务器 (streamable-http 模式)
uv run postgres-mcp --access-mode=unrestricted --transport=streamable-http

测试

# 运行所有测试 (需要 Docker)
uv run pytest -v --log-cli-level=INFO

# 运行单个测试文件
uv run pytest tests/unit/sql/test_safe_sql.py -v

# 运行单个测试
uv run pytest tests/unit/sql/test_db_conn_pool.py::test_pool_connect_success -v

代码质量检查

# 格式化检查
uv run ruff format --check .

# 格式化修复
uv run ruff format .

# Lint 检查
uv run ruff check .

# Lint 修复
uv run ruff check . --fix

# 类型检查
uv run pyright

构建

uv build

核心架构

主入口

  • src/postgres_mcp/__init__.py: main() 入口点
  • src/postgres_mcp/server.py: FastMCP 服务器定义,包含所有 MCP 工具

MCP 工具 (server.py)

工具名 功能
list_schemas 列出数据库所有 schema
list_objects 列出 schema 内的对象 (表、视图、序列、扩展)
get_object_details 获取对象详细信息 (列、约束、索引)
execute_sql 执行 SQL (受访问模式限制)
explain_query 获取查询执行计划,支持假设索引模拟
get_top_queries 基于 pg_stat_statements 报告最慢查询
analyze_workload_indexes 分析工作负载并推荐索引
analyze_query_indexes 分析特定查询并推荐索引
analyze_db_health 全面健康检查

模块结构

  • sql: 数据库连接池 (DbConnPool) 和 SQL 执行驱动 (SqlDriver, SafeSqlDriver)

    • safe_sql.py: 只读事务保护,使用 pglast 解析 SQL 防止绕过
    • bind_params.py: 参数绑定,从表统计信息采样生成参数值
    • extension_utils.py: 检查 pg_stat_statements 和 hypopg 扩展状态
  • index: 索引调优 (基于 Microsoft DTA Anytime Algorithm)

    • dta_calc.py: DatabaseTuningAdvisor 核心算法
    • index_opt_base.py: 基础索引优化类
    • llm_opt.py: 实验性 LLM 索引优化
  • database_health: 数据库健康检查 (源自 PgHero)

    • 索引健康、缓冲缓存命中率、连接健康、Vacuum 健康、复制健康、约束健康、序列健康

Read the full file on GitHub · 127 lines

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. 8d ago First seen · 127 lines · 1,101 tokens per session scan A a8982cf91173

Subscribe to this mod's changes

postgres-mcp CLAUDE.md is an instructions file published in the GitHub repository mirenqinggege/postgres-mcp (0 stars, last pushed 4mo ago), licensed MIT. It adds 1,101 tokens to every session, about $0.0055 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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