SQL Safe MCP

Name: SQL Safe MCP
Author: proprock

by proprockversion 1.5.2i★ –iRuns on your computer

Registry nameio.github.proprock/sql-safe-mcp

Install

Overview

Description from the maker (original English)

Minimal, read-only, PII-safe MCP server for SQL databases.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Databases & datasets

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "sql-safe": {
      "command": "uvx",
      "args": [
        "sql-safe-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add sql-safe -- uvx sql-safe-mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "sql-safe": {
      "command": "uvx",
      "args": [
        "sql-safe-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "sql-safe": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "sql-safe-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account proprock, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Databases & datasetsi

More stars than 0% of the other 953 servers in this category
Published to the registry more recently than 66% of the other 953 servers in this category
Basic checks equal to or better than 100% of the other 953 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is SQL Safe MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.5.2) reached the registry 31 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Supabase, MongoDB MCP Server, Elasticsearch MCP Server

Alternatives

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

sql-safe-mcp

A PII-safe, read-only MCP server for coding agents working with SQL Server, MySQL and MariaDB: schema knowledge and safe queries without write-capable tools or plaintext exposure of configured PII columns.

Read the data. Protect the identity.

Give a coding agent the schema knowledge it needs to write correct code - servers, databases, tables, columns, keys, indexes, and stored procedures. On aliases you mark all_pii_safe, it can also query real rows while configured personal data stays hidden behind authenticated tokens.

PII-safe by default. Read-only by design.

PII-safe by default - on an all_pii_safe server, the columns you configure come back as alias-bound, authenticated tokens (pii:v1:...), never as plaintext. An agent can still project, count, and filter on them with = and IN using tokens it was given, so it can follow a record without reading it. Tokens do not work on another server alias or with another key.
Read-only by construction - seven tools, all annotated read-only. No tool writes data, and the server never executes SQL an agent wrote: metadata comes from SQLAlchemy Inspector and fixed catalog queries, and execute_sql runs only a validated, regenerated SELECT.
Multiple servers, isolated policies - one MCP process can expose multiple named SQL Server, MySQL, and MariaDB instances. Each alias has its own connection, access level, and, when enabled, PII key and protection rules. Every database operation targets an explicit alias; there is no network discovery.

Operational safeguards

Fails closed - SQL validation is an allowlist. Unknown syntax, unresolved lineage, and unsupported protected-value types are refused, not guessed at. The verification evidence is in the security model.
Least access first - access_level: metadata (the default) exposes database navigation and table structure; meta_and_code additionally exposes stored procedures; execute_sql needs an explicit all_pii_safe alias with its own key. Database permissions stay the primary control, so use a least-privilege login.
Secrets stay out of sight - connection URLs live in YAML with ${NAME} placeholders resolved from the environment. They never appear in logs or model-visible errors.
Compact, predictable output - object-rooted results with stable sorting, literal case-insensitive name filters, and stored procedure lists that do not expand definitions.
Errors an agent can act on - an ambiguous name lists the candidate schemas. Errors never contain connection details, credentials, keys, tokens, or rows.
Tested against attacks, not just examples - the SQL and PII boundary is checked with an adversarial corpus of hostile statements, property-based tests (token isolation, tamper resistance), a live attack run against a really writable login with before/after snapshots, and mutation testing. Results are in Verification of the SQL boundary.
Diagnosable failures - a timeout or connection error carries a Reference, and the stderr log records the connection stage, elapsed time, and driver error for the same reference, with credentials removed. See Logging.

Tool	Access	Purpose
`list_servers`	🟢 read	Configured server aliases
`list_databases`	🟢 read	Databases visible to the credentials
`list_tables`	🟢 read	Base tables, filtered by schema or name
`get_table_definition`	🟢 read	Columns, keys, constraints, and indexes of one table
`list_stored_procedures`	🟢 read	Stored procedures, without definitions; requires `meta_and_code` or `all_pii_safe`
`get_stored_procedure`	🟢 read	The definition of one stored procedure; requires `meta_and_code` or `all_pii_safe`
`execute_sql`	🟢 read	One restricted `SELECT` on an `all_pii_safe` server; protected columns return tokens

[!NOTE]

Status: SQL Server supports every tool. MySQL and MariaDB (engine: mysql or mariadb,

mysql+pymysql URLs) support every tool too. schema is always null there because the

database is the catalog, and execute_sql uses LIMIT instead of TOP. See

architecture.md.

Quick start

Install

uvx sql-safe-mcp

pip install sql-safe-mcp

Pin a version when you want a fixed surface: uvx sql-safe-mcp==1.5.2.

Requires Python 3.12–3.14, uv (or pip), and Microsoft ODBC Driver 18 for SQL Server when you connect to SQL Server. MySQL and MariaDB use the bundled PyMySQL driver and need nothing else.

Verified against SQL Server 2022, MySQL 8.4, and MariaDB 11.4 (see checks.md).

Or you can even ask an agent to install it

Install sql-safe-mcp as a stdio MCP server.

Ask whether to install it for this project/workspace or at user level. Then: detect and preserve the host's existing MCP config; configure the server to run via uvx sql-safe-mcp; create a YAML config template with env placeholders only; add SQL_SAFE_MCP_CONFIG; report the env variables the user must set. Do not store secrets or connection data in tracked files or output. Validate with sql-safe-mcp --check-config once variables are available.

Configure server

Copy sql-safe-mcp.example-simple.yaml to sql-safe-mcp.yaml. This smallest configuration exposes schema metadata from one SQL Server instance and does not allow row queries. Keep the complete connection URL in an environment variable:

version: 1

servers: reporting: engine: sqlserver access_level: metadata connection_url: "${REPORTING_SQL_URL}"

Here reporting is the value an agent passes as server. A missing variable, or an engine that does not match the URL dialect, stops the MCP server at startup. For multiple servers, local PII rules, shared PII rule sets, logging, and runtime limits, use the commented examples in the configuration reference.

Check the configuration

After defining every environment variable referenced by the YAML file, point the server at it with SQL_SAFE_MCP_CONFIG (or --config) and check it without connecting to any database:

SQL_SAFE_MCP_CONFIG=sql-safe-mcp.yaml uvx sql-safe-mcp --check-config

Configuration is validated at startup, and an error names the problem without printing a URL or secret. Keep credentials in the host's own configuration and never commit them. The server acts with the database account's permissions, so use a dedicated login with the least access the job needs.

Connect an MCP client

Every client configuration needs SQL_SAFE_MCP_CONFIG plus the environment variables referenced by your YAML file. Keep connection URLs and PII keys in the MCP host's environment or configuration, never in the YAML file or other tracked files.

Claude Code

claude mcp add --env SQL_SAFE_MCP_CONFIG=/path/to/sql-safe-mcp.yaml --env REPORTING_SQL_URL=mssql+pyodbc://... --transport stdio sql-safe -- uvx sql-safe-mcp

Put at least one other option between the last --env and the server name, as above. Otherwise, the CLI reads the name as another KEY=value pair.

Claude Desktop

Add the server to claude_desktop_config.json:

"mcpServers": { "sql-safe": { "command": "uvx", "args": ["sql-safe-mcp"], "env": { "SQL_SAFE_MCP_CONFIG": "/path/to/sql-safe-mcp.yaml", "REPORTING_SQL_URL": "mssql+pyodbc://..." } } } }

Codex CLI

codex mcp add sql-safe --env SQL_SAFE_MCP_CONFIG=/path/to/sql-safe-mcp.yaml --env REPORTING_SQL_URL=mssql+pyodbc://... -- uvx sql-safe-mcp

Any other stdio host

Use command uvx, argument sql-safe-mcp, and set SQL_SAFE_MCP_CONFIG plus every environment variable referenced by the configuration file. The server writes MCP messages to stdout and logs only to stderr.

PII-safe queries

execute_sql on the billing alias allows one restricted SELECT. For example, these arguments:

"server": "billing", "database": "Billing", "sql": "SELECT CustomerId, Email FROM dbo.Customers" }

can return a row such as [42, "pii:v1:..."]: the agent can follow the customer without reading the email address. A token is accepted only in = and IN predicates on the same server alias. If FirstName is protected, SELECT FirstName FROM Users WHERE FirstName = 'Alice' is rejected before it reaches the database. Filter protected columns only with authentic pii:v1:... tokens returned by execute_sql for the same alias; a matching prefix alone is not enough. Each token is authenticated and alias-bound, then validated and converted to a bound database value. Protection covers the columns you list, so list every column that holds personal data.

Documentation

Configuration reference - aliases, connection URLs, PII rules, runtime limits, and logging.
Tool reference - arguments, responses, errors, and the accepted SQL subset.
Security model - trust boundaries, guarantees, limitations, and verification.
Checks - local, integration, and security verification commands.

Security

The MCP caller, SQL input, database metadata, rows, and tokens are untrusted. Database permissions remain the primary authorization control - this server never widens them. Read the full security model, including its limitations and verification evidence. To report a vulnerability, use the private channel in SECURITY.md.

Contributing

Setup, checks, the test commands, the branch and commit conventions, and the release model are in CONTRIBUTING.md. Changes that affect someone running the server are recorded in CHANGELOG.md.

License

MIT.

SQL Safe MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Databases & datasetsi

Common questions

Alternatives

Supabase

MongoDB MCP Server

Elasticsearch MCP Server

README from the maker

sql-safe-mcp

PII-safe by default. Read-only by design.

Operational safeguards

Quick start

Install

Configure server

Check the configuration

Connect an MCP client

PII-safe queries

Documentation

Security

Contributing

License