Execute a read-only SQL query (SELECT) against the configured SQL Server database.
AI agents call query to retrieve information from Mcp Sqlserver without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from the database without any ability to create, modify, or delete records. The read-only constraint and explicit SELECT-only scope place it firmly in the Read category. Severity is low because even if misused, the tool cannot alter database state or cause irreversible damage. The sibling tools (describe_table, list_tables) are similarly read-only operations.
From the tool's definition Tool description explicitly states 'Execute a read-only SQL query (SELECT)' and server description emphasizes 'read-only queries'. The tool is constrained to SELECT statements with no modification capability.
Attacks that exploit this kind of access
Execute a read-only SQL query (SELECT) against the configured SQL Server database. It is categorised as a Read tool in the Mcp Sqlserver MCP Server, which means it retrieves data without modifying state.
Register the Mcp Sqlserver MCP server in PolicyLayer and add a rule for query: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mcp Sqlserver. Nothing to install.
query is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the query rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for query. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
query is provided by the Mcp Sqlserver MCP server (mlsloynaz/mcp-sql-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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