AI agents call query_knowledge to retrieve information from Knowledge without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a semantic search query against an indexed knowledge base. This is purely a data retrieval operation with no capability to modify, delete, execute code, or commit financial transactions. It returns results from the knowledge base without altering state.
From the tool's definition Tool description explicitly states 'Search the knowledge base using semantic search.' The action is read-only retrieval with no modification or side effects.
Attacks that exploit this kind of access
Search the knowledge base using semantic search. It is categorised as a Read tool in the Knowledge MCP Server, which means it retrieves data without modifying state.
Register the Knowledge MCP server in PolicyLayer and add a rule for query_knowledge: 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 Knowledge. Nothing to install.
query_knowledge 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 query_knowledge 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 query_knowledge. 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.
query_knowledge is provided by the Knowledge MCP server (numericalpie/knowledge-mcp-server). 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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