zulip_unsubscribe_from_stream · Zulip MCP Server MCP

WHAT IT DOES

What zulip_unsubscribe_from_stream does on Zulip MCP Server

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

WHY IT NEEDS A POLICY

Why zulip_unsubscribe_from_stream needs a policy

This tool modifies user preferences and stream subscriptions in a reversible manner. Unsubscribing can be undone by resubscribing, placing it in the Write category rather than Destructive. The severity is medium because unsubscribing could disrupt a user's access to important communications and require manual resubscription to restore, but the action itself is reversible and does not permanently destroy data.

From the tool's definition Tool name 'zulip_unsubscribe_from_stream' and description 'Unsubscribe from one or more Zulip streams' indicate modification of user subscription state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

zulip_unsubscribe_from_stream Rate-limited

zulip_unsubscribe_from_stream 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": {
    "zulip_unsubscribe_from_stream": {
      "limits": [
        {
          "counter": "zulip_unsubscribe_from_stream_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 Zulip MCP Server, so you can run agents against it safely.

FAQ

Questions about zulip_unsubscribe_from_stream

What does the zulip_unsubscribe_from_stream tool do? +

Unsubscribe from one or more Zulip streams. It is categorised as a Write tool in the Zulip 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 zulip_unsubscribe_from_stream? +

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

What risk level is zulip_unsubscribe_from_stream? +

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

Can I rate-limit zulip_unsubscribe_from_stream? +

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

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

zulip_unsubscribe_from_stream is provided by the Zulip MCP Server MCP server (prixite/zulip-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.