database-mcp

MCP servers that give AI clients safe, structured access to SQL databases.

One installable package per database engine, in TypeScript (npm) and Python

(PyPI). Every package exposes the same minimal two-tool surface,

`execute_sql` and `search_objects`, with guardrails on by default: read-only

mode, row caps, and statement timeouts.

Packages

Both lines are published and pass the same language-agnostic conformance

suite against real databases in CI, so behavior is identical regardless of

language. Every engine is also listed on the

MCP Registry with both install

options.

Go and Rust implementations are planned.

Design principles

• Two tools, no more. A tiny tool surface keeps the model's context window

clean. `search_objects` progressively discloses schema: call it with no

arguments to list tables, with a table name to get columns, indexes, and

foreign keys.

• Safe by default. Read-only mode is enforced in two layers: a

conservative SQL guard, plus a session-level read-only setting in the

database itself. Rows are capped (default 1000) and statements time out

(default 30s).

• Configured at launch, never via chat. Connection details come from

flags, a YAML config file, or environment variables. Credentials are never

accepted through a tool call.

• Secrets never appear in logs. Passwords live in non-printable secret

types, DSNs are sanitized before logging, and a redaction filter guards the

log boundary.

Quick start

Pick your engine's package; each README has the full config surface. SQLite

via npm:

{
  "mcpServers": {
    "sqlite": {
      "command": "npx",
      "args": ["-y", "@database-mcp/sqlite", "--dsn", "/absolute/path/to/database.db"]
    }
  }
}

Or via PyPI: use `"command": "uvx"` and

`"args": ["database-mcp-sqlite", "--dsn", "/absolute/path/to/database.db"]`.

Flags, environment variables, and YAML config are identical across both

lines.

Networked engines take credentials from the environment (`MYSQL_*`,

`MARIADB_*`, `POSTGRES_*`/`DATABASE_URL`, `LIBSQL_URL`/`LIBSQL_AUTH_TOKEN`),

`*_FILE` mounted secrets, or a YAML file via `--config`. Never from a chat

prompt.

Contributing

See CONTRIBUTING.md. The short version: the conformance

suite is the definition of done. A change is mergeable only when

`conformance/run.mjs` passes against every affected server.

License

MIT