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mgba_pause

Pause GBA emulation. Halts game execution for state inspection or break.

Instructions

Pause emulation.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • Tool definition (name, description, inputSchema) for mgba_pause — defines the tool with an empty input schema, meaning no parameters needed.
    {
      name: "mgba_pause",
      description: "Pause emulation.",
      inputSchema: { type: "object", properties: {} },
    },
  • Handler for mgba_pause tool — calls mgba.call('pause') via the MgbaClient RPC bridge and returns a success message.
    case "mgba_pause": {
      await mgba.call("pause");
      return ok("Emulation paused");
    }
  • src/tools.ts:258-261 (registration)
    Registration function registerTools — registers the tool list and call handler on the MCP server, linking the mgba_pause case in the switch statement.
    export function registerTools(server: Server, mgba: MgbaClient): void {
      server.setRequestHandler(ListToolsRequestSchema, async () => ({ tools: TOOLS }));
    
      server.setRequestHandler(CallToolRequestSchema, async (req) => {
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description must fully disclose behavior. It only states the surface action without mentioning side effects, state implications, or whether the operation is safe (e.g., read-only).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, minimal sentence with no unnecessary words. It is perfectly concise and front-loaded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple, parameterless action, the description is largely complete. However, adding a note about pairing with mgba_unpause would improve completeness, given the sibling tools.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has zero parameters, and schema coverage is 100%. The description does not need to add parameter details, and it is clear that no inputs are required.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action (Pause) and the resource (emulation). It is specific and unambiguous, though it does not distinguish from sibling tools like mgba_unpause or mgba_reset.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives such as mgba_unpause or mgba_advance_frames. The description offers no context for appropriate use cases.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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