create_block · Groupme MCP: Risk & Policy

WHAT IT DOES

What create_block does on Groupme

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

WHY IT NEEDS A POLICY

Why create_block needs a policy

Blocking a user modifies the relationship state and the user's experience (they cannot contact the blocker), but this is reversible via the 'delete_block' tool present on the server. This makes it a Write action rather than Destructive. The severity is medium because blocking can disrupt communication but affects only the interpersonal relationship, not permanent data loss or financial impact.

From the tool's definition Tool name 'create_block' and description 'Block a user' indicate a modification action that creates a blocking relationship between the current user and a target user.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_block Rate-limited

create_block 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": {
    "create_block": {
      "limits": [
        {
          "counter": "create_block_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 Groupme, so you can run agents against it safely.

FAQ

Questions about create_block

What does the create_block tool do? +

Block a user. It is categorised as a Write tool in the Groupme MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_block? +

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

What risk level is create_block? +

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

Can I rate-limit create_block? +

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

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

create_block is provided by the Groupme MCP server (kalebjs/groupme-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.