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fritzprix

Rubik's Cube MCP Server

by fritzprix

finish

Complete a Rubik's Cube solving session by providing the game session ID to finalize the puzzle solution process.

Instructions

Complete the Rubik's Cube game session

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
gameIdYesThe game session ID

Implementation Reference

  • Handler function for the 'finish' MCP tool that completes the Rubik's Cube game session by marking it as completed, checking if solved, generating a congratulatory or failure message, and returning the final cube state with MCP-formatted content.
    async ({ gameId }: { gameId: string }) => {
      const game = this.games.get(gameId);
      if (!game) {
        throw new Error(`Game session ${gameId} not found`);
      }
    
      const { cube, session } = game;
      const finalState = cube.getState();
    
      session.status = 'completed';
      session.lastActivity = Date.now();
    
      const response: CubeResponse = {
        gameId,
        cube: finalState,
        nextAction: null,
      };
    
      const message = finalState.solved
        ? `🎉 Congratulations! You solved the cube for game ${gameId}.`
        : `Game ${gameId} finished. The cube was not solved.`
    
      return {
        content: [
          { type: "text", text: message },
          { type: "text", text: JSON.stringify(response, null, 2) },
        ],
      };
    }
  • Input schema for the 'finish' tool defined using Zod, requiring a 'gameId' string parameter.
    {
      gameId: z.string().describe("The game session ID")
    },
  • src/app.ts:180-182 (registration)
    Registration of the 'finish' MCP tool on the server, providing the tool name and description.
    this.mcpServer.tool(
      "finish",
      "Complete the Rubik's Cube game session",
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the tool 'completes' a game session, implying a mutation or finalization, but doesn't describe what 'complete' entails (e.g., saves results, ends gameplay, triggers scoring) or any side effects like permissions or rate limits. This leaves significant gaps in understanding the tool's behavior.

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, efficient sentence that directly states the tool's purpose without unnecessary words. It is front-loaded and wastes no space, making it easy for an agent to parse quickly.

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

Completeness2/5

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

Given the complexity of a game completion tool with no annotations and no output schema, the description is insufficient. It doesn't explain what happens upon completion (e.g., returns a score, saves state, or provides confirmation), leaving the agent uncertain about the outcome or how to handle the result.

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

Parameters3/5

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

The input schema has 100% description coverage, clearly documenting the single required parameter 'gameId' as 'The game session ID'. The description adds no additional semantic meaning beyond this, such as format examples or constraints, so it meets the baseline for high schema coverage without compensating value.

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 ('Complete') and the resource ('Rubik's Cube game session'), which is specific and unambiguous. However, it doesn't explicitly differentiate from sibling tools like 'joinGame' or 'manipulateCube', which might involve similar game sessions but different operations.

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?

The description provides no guidance on when to use this tool versus alternatives like 'startCube' or 'manipulateCube'. It lacks context about prerequisites (e.g., must be an active session) or exclusions, leaving the agent to infer usage from the tool name alone.

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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