SafeDB MCP
SafeDB MCP is a secure Model Context Protocol server that lets AI agents inspect and query Postgres, MySQL, MariaDB, and SQLite with strict read-only guardrails. It is designed for teams that want useful database access without handing an agent unrestricted production credentials.
Direct database credentials are dangerous for agents because a single bad prompt, tool call, or generated SQL statement can mutate data, exfiltrate sensitive columns, or run expensive queries. SafeDB MCP puts a policy layer between the agent and your database: only configured schemas and tables are visible, SQL is parsed and validated before execution, row counts are capped, results are masked, and every query attempt is audited.
This project is an MVP. It prefers false positives and blocked queries over unsafe access, and it does not claim perfect SQL security.
Features
- MCP tools:
list_schemas,list_tables,describe_table,run_readonly_query,explain_query,get_safedb_policy - Postgres support through
pg - MySQL and MariaDB support through
mysql2 - SQLite file support through
sql.js - YAML or JSON config with environment expansion
- AST-backed read-only SQL guardrails for
SELECT,WITH ... SELECT,UNION, andEXPLAIN SELECT - Table detection through joins, CTEs, nested subqueries, aliases, and unions
- Column projection checks that block masked fields selected through aliases or expressions
- Configurable table allowlists, denylists, row limits, and statement timeout
- PII masking:
redact,email,partial, and deterministichash - JSONL audit log with no raw result data
- CLI binary:
safedb-mcp - TypeScript, Vitest, ESLint, Prettier
