set_fast_mode · Screenshot Analyzer MCP: Risk & Policy

WHAT IT DOES

What set_fast_mode does on Screenshot Analyzer MCP

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

WHY IT NEEDS A POLICY

Why set_fast_mode needs a policy

This is a configuration write operation that reversibly changes system behavior (fast mode toggle). It modifies internal state but has no destructive, financial, or execute-level consequences. The change is easily reverted by toggling again.

From the tool's definition Tool name 'set_fast_mode' indicates it modifies a configuration setting. The sibling tool 'set_api_key' and 'set_reasoning_effort' (implied by context) confirm this server has stateful configuration tools.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_fast_mode Rate-limited

set_fast_mode 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": {
    "set_fast_mode": {
      "limits": [
        {
          "counter": "set_fast_mode_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 Screenshot Analyzer MCP, so you can run agents against it safely.

FAQ

Questions about set_fast_mode

What does the set_fast_mode tool do? +

Toggle fast mode for quicker, cheaper analysis. It is categorised as a Write tool in the Screenshot Analyzer 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 set_fast_mode? +

Register the Screenshot Analyzer MCP server in PolicyLayer and add a rule for set_fast_mode: 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 Screenshot Analyzer MCP. Nothing to install.

What risk level is set_fast_mode? +

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

Can I rate-limit set_fast_mode? +

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

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

set_fast_mode is provided by the Screenshot Analyzer MCP server (sasuke-inu/ui-screenshot-android-review-openai). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.