add_group_members · Smartsheet MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_group_members does on Smartsheet MCP Server

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

WHY IT NEEDS A POLICY

Why add_group_members needs a policy

This tool creates or modifies group membership data within Smartsheet. It is a Write category action because it adds members to a group (reversible change to data), not a Read operation (no retrieval of data without side effects), and not Destructive/Execute/Financial.

From the tool's definition Tool name 'add_group_members' and description 'Adds members to a group' indicate a create/modify operation that alters group membership in Smartsheet, which is a reversible write action (members can be removed).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_group_members Rate-limited

add_group_members 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": {
    "add_group_members": {
      "limits": [
        {
          "counter": "add_group_members_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 Smartsheet MCP Server, so you can run agents against it safely.

FAQ

Questions about add_group_members

What does the add_group_members tool do? +

Adds members to a group. It is categorised as a Write tool in the Smartsheet 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 add_group_members? +

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

What risk level is add_group_members? +

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

Can I rate-limit add_group_members? +

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

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

add_group_members is provided by the Smartsheet MCP Server MCP server (thomaswtwrt/smar-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.