Search a knowledge base using semantic search via Open WebUI API
AI agents call search_knowledge_base to retrieve information from Open WebUI Knowledge Base MCP Server 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 against an existing knowledge base, which is a read-only retrieval operation. It queries data and returns results with no side effects, state changes, or irreversible actions. This aligns squarely with the 'Read' category (search, list, get, fetch). Even if misused by an AI agent, the worst outcome would be exposure of information already in the knowledge base, posing minimal harm.
From the tool's definition Tool name and description: 'search_knowledge_base' and 'Search a knowledge base using semantic search via Open WebUI API'. This is explicitly a search operation that retrieves data without modifying or deleting anything.
Attacks that exploit this kind of access
Search a knowledge base using semantic search via Open WebUI API. It is categorised as a Read tool in the Open WebUI Knowledge Base MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Open WebUI Knowledge Base MCP Server 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 Open WebUI Knowledge Base MCP Server. 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 Open WebUI Knowledge Base MCP Server MCP server (ronasit/open-webui-mcp-server-python). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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