Gets the schema and parameters of a specific function
AI agents call get_function_schema to retrieve information from SQL Server MCP Service 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 a database function (schema and parameters) without executing code, modifying data, or triggering any state changes. It is a read-only informational query, similar to other metadata tools on the server like 'get_procedure_schema', 'get_table_schema', and 'list_functions'.
From the tool's definition Tool name 'get_function_schema' and description 'Gets the schema and parameters of a specific function' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Gets the schema and parameters of a specific function. It is categorised as a Read tool in the SQL Server MCP Service MCP Server, which means it retrieves data without modifying state.
Register the SQL Server MCP Service MCP server in PolicyLayer and add a rule for get_function_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 SQL Server MCP Service. Nothing to install.
get_function_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_function_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_function_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_function_schema is provided by the SQL Server MCP Service MCP server (vini-cius/mcp-sqlserver). 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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