List all available models including custom models.
AI agents call list_models 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 retrieves and enumerates existing models without creating, modifying, or deleting any data. It is a pure information discovery operation, consistent with Read category tools like 'list' and 'fetch'. Even in an admin context, listing resources is non-destructive and presents minimal risk unless the model names or metadata themselves are sensitive, but listing them is still fundamentally a read operation.
From the tool's definition Tool name is 'list_models' and description states 'List all available models' — this is a query/retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_models 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_models:
{
"version": "1",
"default": "deny",
"tools": {
"list_models": {}
}
}list_models 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 available models including custom models. 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_models: 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_models 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_models 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_models. 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_models 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.
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82 Open WebUI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.