update_sheet_share · Smartsheet MCP Server MCP

WHAT IT DOES

What update_sheet_share does on Smartsheet MCP Server

AI agents use update_sheet_share 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_sheet_share needs a policy

Updating share access levels is a reversible modification operation that changes who can access a sheet and what permissions they have. While it doesn't create or delete shares, it modifies existing permissions which qualifies as Write.

From the tool's definition Tool name is 'update_sheet_share' and description states it 'Updates the access level of an existing share'. This modifies access control and sharing permissions on Smartsheet resources.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_sheet_share Rate-limited

update_sheet_share 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_sheet_share": {
      "limits": [
        {
          "counter": "update_sheet_share_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_sheet_share

What does the update_sheet_share tool do? +

Updates the access level of an existing share. 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_sheet_share? +

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

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

Can I rate-limit update_sheet_share? +

Yes. Add a rate_limit block to the update_sheet_share 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_sheet_share completely? +

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

update_sheet_share 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.

// THE FULL RECORD

update_sheet_share is one line of Smartsheet MCP Server's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

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