write_to_sheet · Meducate MCP: Risk & Policy

WHAT IT DOES

What write_to_sheet does on Meducate MCP

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

WHY IT NEEDS A POLICY

Why write_to_sheet needs a policy

This tool creates or modifies data (appends to a sheet) in a reversible manner. It is classified as Write rather than Read because it performs a state-changing operation. Severity is medium because unintended writes to a shared Google Sheet could corrupt or contaminate educational data, medical records, or user information, but the operation is reversible through Google Sheets' edit history.

From the tool's definition Tool name 'write_to_sheet' and description 'Appends data to a Google Sheet' indicate modification of data in a spreadsheet.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_to_sheet Rate-limited

write_to_sheet 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": {
    "write_to_sheet": {
      "limits": [
        {
          "counter": "write_to_sheet_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 Meducate MCP, so you can run agents against it safely.

FAQ

Questions about write_to_sheet

What does the write_to_sheet tool do? +

Appends data to a Google Sheet. It is categorised as a Write tool in the Meducate MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_to_sheet? +

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

What risk level is write_to_sheet? +

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

Can I rate-limit write_to_sheet? +

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

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

write_to_sheet is provided by the Meducate MCP server (joshnuku/meducate-mcp-demo). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.