Full read-write Claude connector for Microsoft SQL Server

Let Claude run scoped reads and writes against your Microsoft SQL Server data

Stop opening SSMS to hand-write SQL for every fix and backfill. Claude queries the live database, prepares parameterized writes and migrations where the data already sits, and runs anything destructive only inside a transaction you approve.

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Microsoft SQL Server is Microsoft's relational database engine, running on-premises, in Azure, or as Azure SQL. Teams want Claude to do more than describe a schema: to run real queries and apply changes against the data they already manage.

What is a Microsoft SQL Server MCP server?

A Microsoft SQL Server MCP server is a small hosted service that exposes Microsoft SQL Server's data and actions to Claude over the Model Context Protocol, so Claude can records, tables, and queries inside your own account. We build it as a custom connector with separate read and write tools, and destructive actions stay gated behind your approval.

What can Microsoft SQL Server's current connector do today?

Microsoft ships an official SQL MCP server, and it covers a fixed standard set of data tools: read and the core parameterized writes. It is built to work with data, not schema, so it does not apply migrations like adding a column or creating an index. A custom connector adds that, plus tighter scoping, your specific workflows, and human-in-the-loop confirmation on anything destructive.

What does full read-write Microsoft SQL Server access unlock?

Full read-write access lets Claude run parameterized INSERT, UPDATE, and DELETE statements, execute stored procedures, manage indexes, and apply schema migrations inside a transaction you approve. The investigation that used to mean opening SSMS and hand-writing SQL happens against the live database, with the same guardrails a careful engineer would use.

Run a parameterized INSERT or UPDATE against a specific table
Execute a stored procedure with the arguments you supply
Apply a schema migration (add a column, create an index) inside a transaction
Backfill or correct rows with a guarded, previewed DELETE
Bulk-update records matching a query you have reviewed
Roll a change back if the post-write check does not look right

Can Claude write to my Microsoft SQL Server database?

Claude can write to Microsoft SQL Server through scoped tools that run parameterized INSERT and UPDATE statements, execute stored procedures with the arguments you supply, and apply schema migrations like adding a column or index. Each write runs inside a transaction, and the connector never holds more than its login allows.

Can Claude run a schema migration in Microsoft SQL Server?

Yes. Claude can apply a schema migration in Microsoft SQL Server, such as adding a column or creating an index, inside a transaction you approve. It prepares the statement, you review it, and the change runs with the same guardrails a careful engineer would use, so a bad result can be rolled back.

Can Claude delete or drop data without my approval?

No. DELETE, DROP, and other destructive statements in Microsoft SQL Server are separate, gated tools. Claude can prepare and preview the statement, but it only executes after you confirm, and it runs inside a transaction. You decide which actions stay automatic and which always require a human.

How a Microsoft SQL Server connector works

We build a small MCP server that connects to Microsoft SQL Server with a scoped database login or Azure AD credential, using the narrowest permissions the work needs. Read tools (query, inspect schema) and write tools (insert, update, execute proc, migrate) are separated, and destructive actions like DELETE or DROP require your confirmation and run inside a transaction. The connector never has more access than the account it authenticates as, and where the server sits behind a firewall we work within your IP allowlisting.

Frequently asked questions

Doesn't Microsoft already ship a SQL MCP server?

It does, and it handles a fixed set of data tools: read plus the core parameterized writes. It is scoped to data, not schema, so it does not run migrations like adding a column or creating an index. A custom connector fills that gap and shapes the write tools, scoping, and confirmation steps to your specific workflow rather than a generic tool set.

Can Claude delete or drop data without my approval?

No. DELETE, DROP, and other destructive statements are separate, gated write tools. Claude can prepare and preview the statement, but it only executes after you approve it, and it runs inside a transaction so a bad change can be rolled back. You decide which actions are automatic and which require confirmation.

How does it connect to a SQL Server that sits behind a firewall?

The connector authenticates with a scoped SQL login or Azure AD credential and inherits only that account's permissions. For a server behind a firewall, we work within your network rules and IP allowlisting rather than around them, so the connection follows the same access path your own engineers already use. It never grants more than the login holds.

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