update_summary_fields · Smartsheet MCP Server MCP

WHAT IT DOES

What update_summary_fields does on Smartsheet MCP Server

AI agents use update_summary_fields 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 update_summary_fields needs a policy

The tool creates or modifies data in a reversible manner, fitting the Write category. Severity is medium because updating summary fields affects sheet analytics and reporting but does not permanently delete data or move money.

From the tool's definition Tool name is 'update_summary_fields' and description states it 'Updates existing summary fields' — this modifies data (summary fields) reversibly within Smartsheet sheets.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_summary_fields Rate-limited

update_summary_fields 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": {
    "update_summary_fields": {
      "limits": [
        {
          "counter": "update_summary_fields_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 update_summary_fields

What does the update_summary_fields tool do? +

Updates existing summary fields. 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 update_summary_fields? +

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

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

Can I rate-limit update_summary_fields? +

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

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

update_summary_fields 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.