dual_login · DUAL MCP Server MCP: Risk & Policy

WHAT IT DOES

What dual_login does on DUAL MCP Server

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

WHY IT NEEDS A POLICY

Why dual_login needs a policy

This tool performs an authentication action that creates a session and sets auth state automatically. It is not purely read-only (it establishes a session/token and modifies auth context), but it does not destroy data or move money. Write is the most appropriate category as it creates a session artifact (JWT tokens) and modifies the session's authentication state.

From the tool's definition Authenticate with email/phone and password. Returns JWT tokens for subsequent API calls. Sets auth automatically for this session.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

dual_login Rate-limited

dual_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": {
    "dual_login": {
      "limits": [
        {
          "counter": "dual_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 DUAL MCP Server, so you can run agents against it safely.

FAQ

Questions about dual_login

What does the dual_login tool do? +

Authenticate with email/phone and password. Returns JWT tokens for subsequent API calls. Sets auth automatically for this session. It is categorised as a Write tool in the DUAL 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 dual_login? +

Register the DUAL MCP Server MCP server in PolicyLayer and add a rule for dual_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 DUAL MCP Server. Nothing to install.

What risk level is dual_login? +

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

Can I rate-limit dual_login? +

Yes. Add a rate_limit block to the dual_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 dual_login completely? +

Set action: deny in the PolicyLayer policy for dual_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 dual_login? +

dual_login is provided by the DUAL MCP Server MCP server (ro-ro-b/dual-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.