AI agents call list_tables to retrieve information from Querywise without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
list_tables retrieves schema metadata without modifying or executing code against the database. The operation is non-destructive and has no side effects beyond returning information. The server explicitly states 'Read-only by default', and listing tables is a foundational read operation.
From the tool's definition Tool named 'list_tables' with empty description; function is to enumerate database tables, a typical read-only metadata query operation.
Attacks that exploit this kind of access
list_tables. It is categorised as a Read tool in the Querywise MCP Server, which means it retrieves data without modifying state.
Register the Querywise MCP server in PolicyLayer and add a rule for list_tables: 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 Querywise. Nothing to install.
list_tables 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_tables 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_tables. 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_tables is provided by the Querywise MCP server (kosminus/querywise-mcp). 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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