approve_access · KVMFleet MCP Server MCP: Risk & Policy

WHAT IT DOES

What approve_access does on KVMFleet MCP Server

AI agents use approve_access to create or update resources in KVMFleet MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your KVMFleet MCP Server environment.

WHY IT NEEDS A POLICY

Why approve_access needs a policy

This tool modifies access control state by approving JIT (Just-In-Time) access requests, which is a reversible write operation. While it grants sensitive permissions, it does not execute code, delete data, or move money. The high severity reflects that improper approval could grant unauthorized access to KVM Fleet devices, but the 4-eyes rule mitigates some risk.

From the tool's definition Tool name 'approve_access' and description indicating it 'Approve[s] a pending JIT access request' represents a state-changing operation that grants access permissions.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

approve_access Rate-limited

approve_access 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches KVMFleet MCP Server, so you can run agents against it safely.

FAQ

Questions about approve_access

What does the approve_access tool do? +

Approve a pending JIT access request. Subject to the 4-eyes rule on the server: the approver cannot be the requester. Capturing a documented. It is categorised as a Write tool in the KVMFleet 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 approve_access? +

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

What risk level is approve_access? +

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

Can I rate-limit approve_access? +

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

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

approve_access is provided by the KVMFleet MCP Server MCP server (kvmfleet/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.