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RPG Maker MZ/MV MCP Server

by garuh143

get_system

Retrieve system data from RPG Maker MZ/MV projects to access game configuration, settings, and metadata for development and management tasks.

Instructions

Get system data

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • The getSystem function reads the 'System.json' file for the given project path, serving as the core handler for the 'get_system' tool.
    export async function getSystem(projectPath: string): Promise<SystemData> {
      const systemPath = getDataPath(projectPath, 'System.json');
      return await readJsonFile<SystemData>(systemPath);
    }
Behavior2/5

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

No annotations are provided, so the description carries the full burden of disclosure. While 'Get' implies a read-only operation, the description fails to specify what data structure is returned, whether this requires authentication, or if there are side effects. For a tool with zero parameters, this lack of behavioral context is a significant gap.

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

Conciseness3/5

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

The description is appropriately brief at three words, avoiding bloat. However, this brevity manifests as under-specification rather than efficient information density. The single sentence fails to earn its place by providing actionable detail.

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 simplicity (zero parameters) and lack of output schema, the description should at minimum explain what constitutes 'system data' in this API context (likely game system settings given the RPG Maker-like sibling tools). It provides no such context, leaving the agent uncertain about the tool's utility.

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 input schema has zero properties. According to the rubric, 0 parameters establishes a baseline score of 4. There are no parameters requiring semantic clarification beyond what the empty schema already conveys.

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

Purpose2/5

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

The description 'Get system data' is nearly tautological, restating the tool name with minimal elaboration. While it uses a specific verb ('Get'), it fails to define what 'system' refers to in this game development context (e.g., game configuration vs. system variables), nor does it differentiate from sibling 'get_' tools like get_actor or get_map.

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

Usage Guidelines1/5

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

No guidance provided on when to use this tool versus alternatives. Given siblings like get_game_title, get_switches, and get_variables exist, the description should clarify what specific system-level data this retrieves that those other tools don't cover.

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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