kb_search
AI agents call kb_search to retrieve information from Knowledge Base MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool searches and retrieves data from a knowledge base system. Despite the empty description, the name and context of sibling tools (which handle save, list, and delete operations) clearly indicate kb_search performs read-only retrieval. Confidence is slightly reduced due to the empty description, but the naming convention strongly suggests a standard search/query operation with no side effects.
From the tool's definition Tool name 'kb_search' indicates retrieval of information from a knowledge base without modification capabilities.
Attacks that exploit this kind of access
kb_search. It is categorised as a Read tool in the Knowledge Base MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Knowledge Base MCP Server MCP server in PolicyLayer and add a rule for kb_search: 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 Base MCP Server. Nothing to install.
kb_search 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 kb_search 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 kb_search. 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.
kb_search is provided by the Knowledge Base MCP Server MCP server (leon4s4/knowledge-base-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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