ultimate_play_sid · Commodore 64 Ultimate MCP Server MCP

WHAT IT DOES

What ultimate_play_sid does on Commodore 64 Ultimate MCP Server

AI agents invoke ultimate_play_sid to trigger actions in Commodore 64 Ultimate MCP Server. 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.

THE RISK

High Risk

Why ultimate_play_sid needs a policy

This tool executes an action on physical hardware (the Commodore 64 Ultimate device), causing it to play audio. It is not a simple data read or write, but an external operation that triggers real-world behavior (audio output). No financial or destructive implications, but it falls under Execute due to triggering an external operation on hardware.

From the tool's definition Play a SID file on the Ultimate — triggers audio playback on external hardware via REST API

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

POLICY

How to control ultimate_play_sid

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_play_sid:

policy.json

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

ultimate_play_sid 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.

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.

RATE-LIMIT THIS TOOL →

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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 →

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Go deeper

High-risk tools in Commodore 64 Ultimate MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about ultimate_play_sid

What does the ultimate_play_sid tool do? +

Play a SID file on the Ultimate. It is categorised as a Execute tool in the Commodore 64 Ultimate MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on ultimate_play_sid? +

Register the Commodore 64 Ultimate MCP Server MCP server in PolicyLayer and add a rule for ultimate_play_sid: 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_play_sid? +

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

Can I rate-limit ultimate_play_sid? +

Yes. Add a rate_limit block to the ultimate_play_sid 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_play_sid completely? +

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

ultimate_play_sid 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 →

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39 Commodore 64 Ultimate MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.