add_favorites · Smartsheet MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_favorites does on Smartsheet MCP Server

AI agents use add_favorites 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_favorites needs a policy

This tool modifies data reversibly by adding items to a user's favorites list. It does not retrieve data (Read), execute arbitrary code (Execute), permanently delete data (Destructive), or involve financial transactions (Financial). The operation is easily reversible by removing items from favorites.

From the tool's definition Tool name 'add_favorites' and description 'Adds items to favorites' indicate the tool creates or modifies metadata (favorite status) in a user's Smartsheet workspace.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_favorites Rate-limited

add_favorites 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_favorites": {
      "limits": [
        {
          "counter": "add_favorites_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_favorites

What does the add_favorites tool do? +

Adds items to favorites. 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_favorites? +

Register the Smartsheet MCP Server MCP server in PolicyLayer and add a rule for add_favorites: 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_favorites? +

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

Can I rate-limit add_favorites? +

Yes. Add a rate_limit block to the add_favorites 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_favorites completely? +

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

add_favorites 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.