ListKnowledgeBases
AI agents call ListKnowledgeBases 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 retrieves information about knowledge bases without altering state. Despite the empty description reducing confidence slightly, the naming convention strongly suggests a read operation that queries available knowledge bases. The blast radius of misuse is minimal—an agent listing knowledge bases cannot damage systems or exfiltrate sensitive data beyond visibility of what bases exist.
From the tool's definition Tool name 'ListKnowledgeBases' indicates a listing/retrieval operation with no modification or deletion semantics. The 'List' prefix is a standard AWS API pattern for read-only enumeration of resources.
Attacks that exploit this kind of access
ListKnowledgeBases. 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 ListKnowledgeBases: 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.
ListKnowledgeBases 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 ListKnowledgeBases 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 ListKnowledgeBases. 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.
ListKnowledgeBases 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.