rivian_login · Rivian MCP: Risk & Policy

WHAT IT DOES

What rivian_login does on Rivian MCP

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

WHY IT NEEDS A POLICY

Why rivian_login needs a policy

Logging in creates an authenticated session (a state change on the server) and triggers an external action (sending an OTP via SMS or email). This is more than a pure read — it initiates a multi-step authentication flow with side effects. It does not destroy data or move money, so Write is the most appropriate category.

From the tool's definition 'Log in to your Rivian account' — initiates an authentication session, which creates server-side session state and triggers an OTP to be sent to the user's phone or email.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rivian_login Rate-limited

rivian_login 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": {
    "rivian_login": {
      "limits": [
        {
          "counter": "rivian_login_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 Rivian MCP, so you can run agents against it safely.

FAQ

Questions about rivian_login

What does the rivian_login tool do? +

Log in to your Rivian account. Rivian will send a verification code to your phone or email — use rivian_submit_otp to complete sign-in. It is categorised as a Write tool in the Rivian MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on rivian_login? +

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

What risk level is rivian_login? +

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

Can I rate-limit rivian_login? +

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

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

rivian_login is provided by the Rivian MCP server (patrickheneise/rivian-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.