@mcpolyglot/connector-sql

SQL connector for mcpolyglot. One package, three dialects: Postgres, MySQL/MariaDB, and SQLite. Read-only by default with per-dialect enforcement at the database boundary.

Tools exposed

For every SQL source mcpolyglot generates:

• <id>.list_tables — every table across non-system schemas, with columns.
• <id>.describe_table — one table's columns, types, and primary key.
• <id>.query — read-only SQL with parameterized args, row cap, and timeout.

(Opt-in per-table tools like users.find_by_email are scaffolded by mcpolyglot init and land fully in Wave 3.)

How read-only is enforced

| Dialect | Enforcement | | -------- | ------------------------------------------------------------------------------------------------------------- | | Postgres | BEGIN READ ONLY transaction; rolled back at the end of every call. | | SQLite | PRAGMA query_only = 1; database opened read-only when possible. | | MySQL | AST gate (node-sql-parser mysql grammar) + SET SESSION TRANSACTION READ ONLY + MAX_EXECUTION_TIME hint. |

The AST gate matters on MySQL because SET TRANSACTION READ ONLY is partially honored — the parser refuses anything whose top-level statement isn't a read.

Drivers are optional deps

The dialect drivers (pg, mysql2, better-sqlite3) are declared as optionalDependencies. Install only what you use.

Docs

• Architecture → https://github.com/ishay60/mcpolyglot/blob/develop/ARCHITECTURE.md
• Examples →
  • examples/postgres
  • examples/mysql
  • examples/sqlite

MIT licensed.