fizzy_assign_card · Fizzy Do MCP: Risk & Policy

WHAT IT DOES

What fizzy_assign_card does on Fizzy Do MCP

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

WHY IT NEEDS A POLICY

Why fizzy_assign_card needs a policy

The tool modifies card assignments by adding or removing a user, which is a reversible data modification. This is a Write operation rather than Destructive because the change can be undone by toggling the assignment again.

From the tool's definition Tool description states 'Toggle assignment of a user to a Fizzy card. If the user is not assigned, they will be added. If they are, they will be removed.' This modifies the assignment state of a card, which creates or changes data reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

fizzy_assign_card Rate-limited

fizzy_assign_card 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": {
    "fizzy_assign_card": {
      "limits": [
        {
          "counter": "fizzy_assign_card_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 Fizzy Do MCP, so you can run agents against it safely.

FAQ

Questions about fizzy_assign_card

What does the fizzy_assign_card tool do? +

Toggle assignment of a user to a Fizzy card. If the user is not assigned, they will be added. If they are, they will be removed. It is categorised as a Write tool in the Fizzy Do 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 fizzy_assign_card? +

Register the Fizzy Do MCP server in PolicyLayer and add a rule for fizzy_assign_card: 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 Fizzy Do MCP. Nothing to install.

What risk level is fizzy_assign_card? +

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

Can I rate-limit fizzy_assign_card? +

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

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

fizzy_assign_card is provided by the Fizzy Do MCP server (ryanyogan/fizzy-do-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.