async_tool · OpenAPI REST MCP Server MCP: Risk & Policy

WHAT IT DOES

What async_tool does on OpenAPI REST MCP Server

AI agents call async_tool as a supporting operation in OpenAPI REST MCP Server workflows.

WHY IT NEEDS A POLICY

Why async_tool needs a policy

The description is empty and the name 'async_tool' provides no meaningful signal about what operation is performed. Given the sibling tools on this server include reads, writes, destructive operations, and test execution, this could be anything. Without evidence, I cannot confidently assign a specific category. Confidence is very low.

From the tool's definition Tool name is 'async_tool' with an empty description. No information is available about what this tool does.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

async_tool Rate-limited

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

View as policy code

policy.json

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

SET A RULE FOR THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about async_tool

What does the async_tool tool do? +

async_tool. It is categorised as a Other tool in the OpenAPI REST MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on async_tool? +

Register the OpenAPI REST MCP Server MCP server in PolicyLayer and add a rule for async_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 OpenAPI REST MCP Server. Nothing to install.

What risk level is async_tool? +

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

Can I rate-limit async_tool? +

Yes. Add a rate_limit block to the async_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 async_tool completely? +

Set action: deny in the PolicyLayer policy for async_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 async_tool? +

async_tool is provided by the OpenAPI REST MCP Server MCP server (saranazeer27/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.