capture_screen_with_mode

THE RISK

Low Risk

Why capture_screen_with_mode needs a policy

This tool reads/captures the current screen state of the C64 device. It retrieves visual data without modifying any state, files, or configuration. The only distinction from capture_screen is the explicit mode parameter for rendering. No side effects are described.

From the tool's definition Capture the C64 screen using an explicit screen mode, ignoring the active VIC-II mode

Documented attack patterns abuse exactly the kind of access capture_screen_with_mode gives an agent:

POLICY

How to control capture_screen_with_mode

PolicyLayer is an MCP gateway — it sits between your AI agents and Commodore 64 Ultimate Computer MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for capture_screen_with_mode:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "capture_screen_with_mode": {}
  }
}

capture_screen_with_mode is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Commodore 64 Ultimate Computer MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Commodore 64 Ultimate Computer MCP Server tools

Destructive reset_config_to_default Reset configuration to factory defaults Destructive machine_poweroff Power down the machine (U64 only) Execute drive_reset Reset a specific drive Execute machine_reset Send reset signal to the C64 Execute enter_basic_program Enter a BASIC program directly into C64 memory. Takes BASIC source code text, tokenizes it Execute machine_reboot Restart and reinitialize the Commodore 64 Ultimate device Execute run_crt_file Start a cartridge file from filesystem Execute run_crt_upload Upload and start a cartridge file (base64 or data URL encoded) on the Commodore 64 Ultimat

All 54 Commodore 64 Ultimate Computer MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about capture_screen_with_mode

What does the capture_screen_with_mode tool do? +

Capture the C64 screen using an explicit screen mode, ignoring the active VIC-II mode. Useful when auto-detection may not match the expected rendering. It is categorised as a Read tool in the Commodore 64 Ultimate Computer MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on capture_screen_with_mode? +

Register the Commodore 64 Ultimate Computer MCP Server MCP server in PolicyLayer and add a rule for capture_screen_with_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 Commodore 64 Ultimate Computer MCP Server. Nothing to install.

What risk level is capture_screen_with_mode? +

capture_screen_with_mode is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit capture_screen_with_mode? +

Yes. Add a rate_limit block to the capture_screen_with_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 capture_screen_with_mode completely? +

Set action: deny in the PolicyLayer policy for capture_screen_with_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 capture_screen_with_mode? +

capture_screen_with_mode is provided by the Commodore 64 Ultimate Computer MCP Server MCP server (xphileby/c64u-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Commodore 64 Ultimate Computer MCP Server tool call.

Start from Commodore 64 Ultimate Computer MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →