Search local knowledge files by keyword.
AI agents call search_knowledge_base to retrieve information from AI App MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only searches and retrieves data from a knowledge base without creating, modifying, deleting, or executing anything. It is a read-only query operation with minimal blast radius if misused by an AI agent; the worst outcome would be retrieval of unintended information.
From the tool's definition Tool description states 'Search local knowledge files by keyword' — a retrieval operation with no modification, deletion, or execution capability.
Attacks that exploit this kind of access
Search local knowledge files by keyword. It is categorised as a Read tool in the AI App MCP MCP Server, which means it retrieves data without modifying state.
Register the AI App MCP server in PolicyLayer and add a rule for search_knowledge_base: 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 AI App MCP. Nothing to install.
search_knowledge_base 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 search_knowledge_base 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 search_knowledge_base. 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.
search_knowledge_base is provided by the AI App MCP server (yh008/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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