create-group · Sidemail MCP Server MCP: Risk & Policy

WHAT IT DOES

What create-group does on Sidemail MCP Server

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

WHY IT NEEDS A POLICY

Why create-group needs a policy

Creating a contact group adds new metadata to the system but does not delete, execute arbitrary code, move funds, or trigger external operations beyond email infrastructure. It is reversible (the group can be deleted via sibling tools like delete-contact or domain management).

From the tool's definition Tool name 'create-group' and description 'Create a contact group' indicate creation of a new organizational/data structure. This is a Write operation—it adds a new group entity to the system, modifying the contact management state reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create-group Rate-limited

create-group 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-group": {
      "limits": [
        {
          "counter": "create-group_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 Sidemail MCP Server, so you can run agents against it safely.

FAQ

Questions about create-group

What does the create-group tool do? +

Create a contact group (Sidemail API). It is categorised as a Write tool in the Sidemail 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 create-group? +

Register the Sidemail MCP Server MCP server in PolicyLayer and add a rule for create-group: 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 Sidemail MCP Server. Nothing to install.

What risk level is create-group? +

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

Can I rate-limit create-group? +

Yes. Add a rate_limit block to the create-group 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-group completely? +

Set action: deny in the PolicyLayer policy for create-group. 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-group? +

create-group is provided by the Sidemail MCP Server MCP server (sidemail/sidemail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.