AI agents call get_table_schema to retrieve information from Mssql without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about table structure (column names, types, constraints) without modifying data or executing code. It is a read-only operation with no side effects, fitting the Read category. Severity is low because schema information disclosure has limited immediate impact compared to data exposure or destructive operations.
From the tool's definition Tool name 'get_table_schema' and description 'Gets the schema of a specific table' indicate data retrieval only. No modification, deletion, or execution of commands.
Attacks that exploit this kind of access
Gets the schema of a specific table. It is categorised as a Read tool in the Mssql MCP Server, which means it retrieves data without modifying state.
Register the Mssql MCP server in PolicyLayer and add a rule for get_table_schema: 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 Mssql. Nothing to install.
get_table_schema 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 get_table_schema 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 get_table_schema. 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.
get_table_schema is provided by the Mssql MCP server (terraco89/mcp-server-mssql). 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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