refresh_token · Wolai MCP Server MCP: Risk & Policy

WHAT IT DOES

What refresh_token does on Wolai MCP Server

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

WHY IT NEEDS A POLICY

Why refresh_token needs a policy

Refreshing a token creates or updates security credentials used for API authentication. While not destructive and lacking direct financial impact, this is a Write operation that modifies the authentication state. The severity is medium because misuse could enable unauthorized access to Wolai resources if the new token is exposed or exfiltrated, but the direct impact depends on subsequent tool usage.

From the tool's definition Tool name 'refresh_token' and description 'Refresh the current Wolai API token' indicate modification of authentication credentials.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

refresh_token Rate-limited

refresh_token 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": {
    "refresh_token": {
      "limits": [
        {
          "counter": "refresh_token_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 Wolai MCP Server, so you can run agents against it safely.

FAQ

Questions about refresh_token

What does the refresh_token tool do? +

Refresh the current Wolai API token. It is categorised as a Write tool in the Wolai 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 refresh_token? +

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

What risk level is refresh_token? +

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

Can I rate-limit refresh_token? +

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

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

refresh_token is provided by the Wolai MCP Server MCP server (wuchaoli/wolai-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.