Heimdall

概要

Heimdall acts as a crucial security gatekeeper, sitting between Large Language Models (LLMs) and PostgreSQL databases. It allows AI clients to safely query and explore database schemas, answering questions without the risk of accidental or malicious data modification. By employing an Abstract Syntax Tree (AST) parser, Heimdall meticulously deconstructs every incoming SQL query, rejecting any command that attempts to mutate data (such as INSERT, UPDATE, DELETE, DROP, or ALTER) before it can even touch the database. This robust approach ensures critical production data remains protected, offering superior security compared to regex-based filtering.

主な機能

• High-performance PostgreSQL driver with connection pooling
• Prevents SQL injection and data mutation by LLMs
• Native Model Context Protocol (MCP) integration
• 0 GitHub stars
• AST-Based SQL Security for strict read-only enforcement
• Hexagonal architecture for decoupled and maintainable design

ユースケース

• Enabling LLMs to perform schema discovery and safe data retrieval
• Securely allowing LLMs to query production databases
• Preventing accidental or malicious data modifications by AI clients