sync_tool

THE RISK

Low Risk

Why sync_tool needs a policy

The description is nearly empty and provides no actionable information about what the tool does. 'Synchronous test tool' suggests it may be a utility for testing or health-check purposes with no meaningful side effects, but confidence is very low due to the lack of detail.

From the tool's definition 'A synchronous test tool' - description is minimal and uninformative; name 'sync_tool' does not indicate any specific data operation

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

POLICY

How to control sync_tool

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sync_tool": {
      "limits": [
        {
          "counter": "sync_tool_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

sync_tool gets a rate cap, and everything else on the server is denied unless you say otherwise.

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

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about sync_tool

What does the sync_tool tool do? +

A synchronous test tool. It is categorised as a Other tool in the Vultr MCP MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on sync_tool? +

Register the Vultr MCP server in PolicyLayer and add a rule for sync_tool: 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 Vultr MCP. Nothing to install.

What risk level is sync_tool? +

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

Can I rate-limit sync_tool? +

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

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

sync_tool is provided by the Vultr MCP server (rsp2k/mcp-vultr). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Vultr MCP tool call.

Start from Vultr MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →