Get foreign key relationships for tables
AI agents call mssql_get_relationships to retrieve information from Enhanced MCP MSSQL Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves schema metadata (foreign key relationships) from the database without modifying, executing code against, or deleting any data. It is purely informational and supports the documented read-only access model of the server. The blast radius of misuse is minimal—an agent could discover schema structure but cannot alter or extract sensitive data through this tool alone.
From the tool's definition Tool name 'mssql_get_relationships' and description 'Get foreign key relationships for tables' indicate schema discovery and metadata retrieval with no modification or execution of data.
Attacks that exploit this kind of access
Get foreign key relationships for tables. It is categorised as a Read tool in the Enhanced MCP MSSQL Server MCP Server, which means it retrieves data without modifying state.
Register the Enhanced MCP MSSQL Server MCP server in PolicyLayer and add a rule for mssql_get_relationships: 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 Enhanced MCP MSSQL Server. Nothing to install.
mssql_get_relationships 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 mssql_get_relationships 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 mssql_get_relationships. 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.
mssql_get_relationships is provided by the Enhanced MCP MSSQL Server MCP server (michaelyuwh/mcp-mssql-connector). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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