List all knowledge bases with their IDs, names, and descriptions.
AI agents call list_knowledge_bases to retrieve information from Open WebUI MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves information about knowledge bases without creating, modifying, deleting, or executing any operations. It has no side effects and poses minimal risk even if invoked by an AI agent, as it only exposes existing metadata that the agent would need permission to access anyway within Open WebUI's native permission system.
From the tool's definition Tool name is 'list_knowledge_bases' and description states it 'List all knowledge bases with their IDs, names, and descriptions.' The verb 'list' and the read-only nature of retrieving metadata without modification confirm this is a retrieval operation.
Documented attack patterns abuse exactly the kind of access list_knowledge_bases gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Open WebUI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_knowledge_bases:
{
"version": "1",
"default": "deny",
"tools": {
"list_knowledge_bases": {}
}
}list_knowledge_bases is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all knowledge bases with their IDs, names, and descriptions. It is categorised as a Read tool in the Open WebUI MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Open WebUI MCP Server MCP server in PolicyLayer and add a rule for list_knowledge_bases: 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 MCP Server. Nothing to install.
list_knowledge_bases 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_bases 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_bases. 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_bases is provided by the Open WebUI MCP Server MCP server (troylar/open-webui-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Open WebUI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
82 Open WebUI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.