save_last_screenshot · MCP SAP GUI Server MCP: Risk & Policy

WHAT IT DOES

What save_last_screenshot does on MCP SAP GUI Server

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

WHY IT NEEDS A POLICY

Why save_last_screenshot needs a policy

This tool writes a screenshot file to disk. It creates/saves a file, which is a reversible write operation. The blast radius is low since it only saves an image that was already captured; it doesn't interact with SAP transactions or modify any business data.

From the tool's definition Save the last captured screenshot to a file

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

save_last_screenshot Rate-limited

save_last_screenshot 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": {
    "save_last_screenshot": {
      "limits": [
        {
          "counter": "save_last_screenshot_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 MCP SAP GUI Server, so you can run agents against it safely.

FAQ

Questions about save_last_screenshot

What does the save_last_screenshot tool do? +

Save the last captured screenshot to a file. It is categorised as a Write tool in the MCP SAP GUI 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 save_last_screenshot? +

Register the MCP SAP GUI Server MCP server in PolicyLayer and add a rule for save_last_screenshot: 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 SAP GUI Server. Nothing to install.

What risk level is save_last_screenshot? +

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

Can I rate-limit save_last_screenshot? +

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

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

save_last_screenshot is provided by the MCP SAP GUI Server MCP server (mario-andreschak/mcp-sap-gui). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.