sheets_add_validation · Gworkspace MCP: Risk & Policy

WHAT IT DOES

What sheets_add_validation does on Gworkspace

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

WHY IT NEEDS A POLICY

Why sheets_add_validation needs a policy

This tool creates or modifies data validation rules on spreadsheet cells, which is a reversible change to spreadsheet metadata. It does not execute code, delete data, or create financial transactions. While validation rules can affect user input behavior, the action itself is a standard Write operation that can be undone or modified.

From the tool's definition Tool description states 'Add data validation' with support for DROPDOWN, CHECKBOX, NUMBER, DATE validation types. The verb 'Add' and the action of applying validation rules to spreadsheet cells constitutes modification of spreadsheet structure and properties.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sheets_add_validation Rate-limited

sheets_add_validation 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": {
    "sheets_add_validation": {
      "limits": [
        {
          "counter": "sheets_add_validation_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 Gworkspace, so you can run agents against it safely.

FAQ

Questions about sheets_add_validation

What does the sheets_add_validation tool do? +

Add data validation. validation_type: DROPDOWN, CHECKBOX, NUMBER, DATE. It is categorised as a Write tool in the Gworkspace MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sheets_add_validation? +

Register the Gworkspace MCP server in PolicyLayer and add a rule for sheets_add_validation: 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 Gworkspace. Nothing to install.

What risk level is sheets_add_validation? +

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

Can I rate-limit sheets_add_validation? +

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

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

sheets_add_validation is provided by the Gworkspace MCP server (leoonic/gworkspace-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.