mgba_run_sequence · mGBA MCP Server MCP: Risk & Policy

WHAT IT DOES

What mgba_run_sequence does on mGBA MCP Server

AI agents invoke mgba_run_sequence to trigger actions in mGBA 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.

WHY IT NEEDS A POLICY

Why mgba_run_sequence needs a policy

This tool executes game logic via button input sequences with side effects (savestate creation, gameplay progression). While it doesn't execute arbitrary code directly like mgba_run_lua, it triggers deterministic but complex emulated behavior based on user-controlled inputs.

From the tool's definition Tool runs ROM for multiple frames with periodic screenshots, optional button inputs, and savestate creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mgba_run_sequence Rate-limited

mgba_run_sequence 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches mGBA MCP Server, so you can run agents against it safely.

FAQ

Questions about mgba_run_sequence

What does the mgba_run_sequence tool do? +

Run ROM for multiple frames with periodic screenshots, optional button inputs, and savestate creation. Perfect for stability testing, gameplay automation, and building test save state libraries. It is categorised as a Execute tool in the mGBA 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 mgba_run_sequence? +

Register the mGBA MCP Server MCP server in PolicyLayer and add a rule for mgba_run_sequence: 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 mGBA MCP Server. Nothing to install.

What risk level is mgba_run_sequence? +

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

Can I rate-limit mgba_run_sequence? +

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

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

mgba_run_sequence is provided by the mGBA MCP Server MCP server (struktured-labs/mgba-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.