manage_proxies

THE RISK

Medium Risk

Why manage_proxies needs a policy

This tool creates or modifies proxy configurations reversibly, which is characteristic of Write category tools. While proxy misconfigurations could redirect traffic maliciously, the action itself is reversible and does not permanently destroy data or execute arbitrary code.

From the tool's definition Tool name 'manage_proxies' and description 'Manage proxy configurations for routing browser traffic' indicate creation, modification, or configuration of proxy settings.

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

POLICY

How to control manage_proxies

PolicyLayer is an MCP gateway — it sits between your AI agents and Kernel MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for manage_proxies:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "manage_proxies": {
      "limits": [
        {
          "counter": "manage_proxies_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

manage_proxies stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Kernel 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 16 Kernel MCP Server tools →

Write 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.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about manage_proxies

What does the manage_proxies tool do? +

Manage proxy configurations for routing browser traffic. Use. It is categorised as a Write tool in the Kernel MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on manage_proxies? +

Register the Kernel MCP Server MCP server in PolicyLayer and add a rule for manage_proxies: 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 Kernel MCP Server. Nothing to install.

What risk level is manage_proxies? +

manage_proxies is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit manage_proxies? +

Yes. Add a rate_limit block to the manage_proxies 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 manage_proxies completely? +

Set action: deny in the PolicyLayer policy for manage_proxies. 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 manage_proxies? +

manage_proxies is provided by the Kernel MCP Server MCP server (kernel/kernel-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 Kernel MCP Server tool call.

Start from Kernel 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 →