ultimate_set_connection

THE RISK

Medium Risk

Why ultimate_set_connection needs a policy

This tool creates or modifies device connection configuration. While the change is reversible (a new connection can be set), it alters the operational state of the system. The scope is limited to network configuration rather than data deletion or financial impact, placing it in Write.

From the tool's definition Tool description states it 'Set[s] the hostname and port of the Ultimate C64 device' — this modifies device configuration settings that control how the device communicates.

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

POLICY

How to control ultimate_set_connection

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ultimate_set_connection": {
      "limits": [
        {
          "counter": "ultimate_set_connection_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

ultimate_set_connection 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.

Create a free account and register Commodore 64 Ultimate 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Commodore 64 Ultimate MCP Server tools

Destructive ultimate_reset_config Reset configuration to factory defaults Destructive ultimate_power_off Power off the Ultimate device (hardware power off) Execute ultimate_reset_machine Reset the C64 machine (soft reset) Execute ultimate_soft_reset Perform a soft reset (load empty program) Execute ultimate_run_cartridge Load and run a cartridge file Execute ultimate_run_prg_binary Upload and run a PRG file. Accepts file path, base64-encoded binary data, or URL to downlo Execute ultimate_run_program Load and run a program on the C64 Execute ultimate_start_stream Start a data stream (U64 only: video, audio, debug)

All 39 Commodore 64 Ultimate MCP Server tools →

Write 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.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about ultimate_set_connection

What does the ultimate_set_connection tool do? +

Set the hostname and port of the Ultimate C64 device. It is categorised as a Write tool in the Commodore 64 Ultimate MCP 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 ultimate_set_connection? +

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

What risk level is ultimate_set_connection? +

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

Can I rate-limit ultimate_set_connection? +

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

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

ultimate_set_connection is provided by the Commodore 64 Ultimate MCP Server MCP server (martijn-devrev/ultimate64mcp). 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 MCP Server tool call.

Start from Commodore 64 Ultimate 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 →