Lists all functions (scalar and table-valued) in the database
AI agents call list_functions 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 database functions without modifying, executing, or deleting any data. It is purely informational, similar to list_tables and list_procedures, making it a Read category tool with low severity.
From the tool's definition Tool name is 'list_functions' and description states it 'Lists all functions (scalar and table-valued) in the database' — a retrieval operation with no side effects.
Attacks that exploit this kind of access
Lists all functions (scalar and table-valued) in the database. 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 list_functions: 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.
list_functions 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 list_functions 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 list_functions. 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.
list_functions 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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