get_tool_servers

THE RISK

Low Risk

Why get_tool_servers needs a policy

This tool retrieves configuration data about connected tool servers without modifying or deleting anything. It is a read operation. Severity is medium because unauthorized disclosure of tool server configurations and connection details could expose internal system architecture and potentially reveal API endpoints or authentication details that could be leveraged for further attacks, but the operation itself has no…

From the tool's definition Tool name 'get_tool_servers' and description 'Get tool server (MCP/OpenAPI) connections' indicate a read/retrieval operation that queries existing tool server configurations. The 'ADMIN ONLY' restriction suggests this returns sensitive system information.

Risk signalsAdmin/system-level operation

Documented attack patterns abuse exactly the kind of access get_tool_servers gives an agent:

POLICY

How to control get_tool_servers

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 get_tool_servers:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_tool_servers": {}
  }
}

get_tool_servers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Open WebUI MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_tool_servers

What does the get_tool_servers tool do? +

Get tool server (MCP/OpenAPI) connections. ADMIN ONLY. It is categorised as a Read tool in the Open WebUI MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_tool_servers? +

Register the Open WebUI MCP Server MCP server in PolicyLayer and add a rule for get_tool_servers: 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.

What risk level is get_tool_servers? +

get_tool_servers is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_tool_servers? +

Yes. Add a rate_limit block to the get_tool_servers 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.

How do I block get_tool_servers completely? +

Set action: deny in the PolicyLayer policy for get_tool_servers. 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.

What MCP server provides get_tool_servers? +

get_tool_servers 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.

Enforce policy on every Open WebUI MCP Server tool call.

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.

CHECK YOUR STACK →