List all knowledge databases (layers) registered in Metis.
AI agents call list_knowledge_databases to retrieve information from Metis Public Health without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a query operation to enumerate registered databases. It has no side effects, does not execute code, does not modify data, and does not delete resources. The blast radius of misuse is minimal—an agent could discover what databases exist locally, but cannot access their contents or alter the system. This is purely informational retrieval.
From the tool's definition Tool name 'list_knowledge_databases' and description 'List all knowledge databases (layers) registered in Metis' indicate a read-only operation that retrieves metadata about available databases without modifying, executing, or deleting anything.
Attacks that exploit this kind of access
List all knowledge databases (layers) registered in Metis. It is categorised as a Read tool in the Metis Public Health MCP Server, which means it retrieves data without modifying state.
Register the Metis Public Health MCP server in PolicyLayer and add a rule for list_knowledge_databases: 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 Metis Public Health. Nothing to install.
list_knowledge_databases 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_knowledge_databases 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_knowledge_databases. 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_knowledge_databases is provided by the Metis Public Health MCP server (sveritg/metis_ph). 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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