mcp__willys_login · Willys MCP Server MCP: Risk & Policy

WHAT IT DOES

What mcp__willys_login does on Willys MCP Server

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

WHY IT NEEDS A POLICY

Why mcp__willys_login needs a policy

This tool authenticates a user and establishes a session, which is a stateful write operation (creating a session). It is not purely a read operation since it creates a session server-side.

From the tool's definition Login to Willys with username and password. Returns a sessionId that must be used in subsequent tool calls.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mcp__willys_login Rate-limited

mcp__willys_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": {
    "mcp__willys_login": {
      "limits": [
        {
          "counter": "mcp__willys_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 Willys MCP Server, so you can run agents against it safely.

FAQ

Questions about mcp__willys_login

What does the mcp__willys_login tool do? +

Login to Willys with username and password. Returns a sessionId that must be used in subsequent tool calls. It is categorised as a Write tool in the Willys 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 mcp__willys_login? +

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

What risk level is mcp__willys_login? +

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

Can I rate-limit mcp__willys_login? +

Yes. Add a rate_limit block to the mcp__willys_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 mcp__willys_login completely? +

Set action: deny in the PolicyLayer policy for mcp__willys_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 mcp__willys_login? +

mcp__willys_login is provided by the Willys MCP Server MCP server (jimmystridh/willys-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.