Lists all tables in a specified keyspace - args: keyspace
AI agents call listTables to retrieve information from Amazon MQ MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple enumeration/listing of database schema objects (tables within a keyspace). It has no side effects, does not modify data, execute code, delete resources, or commit financial transactions. The blast radius of misuse is minimal—an agent could enumerate schema but cannot alter or damage systems.
From the tool's definition Tool name 'listTables' and description 'Lists all tables in a specified keyspace' indicate a read-only query operation that retrieves metadata without modifying or executing operations.
Attacks that exploit this kind of access
Lists all tables in a specified keyspace - args: keyspace. It is categorised as a Read tool in the Amazon MQ MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Amazon MQ MCP Server MCP server in PolicyLayer and add a rule for listTables: 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 Amazon MQ MCP Server. Nothing to install.
listTables 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 listTables 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 listTables. 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.
listTables is provided by the Amazon MQ MCP Server MCP server (awslabs.amazon-mq-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.