generate_diagram · Mcp Gmail MCP: Risk & Policy

WHAT IT DOES

What generate_diagram does on Mcp Gmail

AI agents invoke generate_diagram to trigger actions in Mcp Gmail. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why generate_diagram needs a policy

This tool triggers an external API call (Eraser API) to generate diagrams, making it an Execute category — it invokes an external service whose effects depend on the arguments passed. Severity is medium due to potential API usage costs, rate limits, or unintended external data exposure.

From the tool's definition Generates an Entity Relationship Diagram (ERD) or other diagram types using Eraser API

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_diagram Rate-limited

generate_diagram stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "generate_diagram": {
      "limits": [
        {
          "counter": "generate_diagram_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mcp Gmail, so you can run agents against it safely.

FAQ

Questions about generate_diagram

What does the generate_diagram tool do? +

Generates an Entity Relationship Diagram (ERD) or other diagram types using Eraser API. It is categorised as a Execute tool in the Mcp Gmail MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on generate_diagram? +

Register the Mcp Gmail MCP server in PolicyLayer and add a rule for generate_diagram: 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 Mcp Gmail. Nothing to install.

What risk level is generate_diagram? +

generate_diagram is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit generate_diagram? +

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

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

generate_diagram is provided by the Mcp Gmail MCP server (@monsoft/mcp-gmail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.