GameDevBench MCP

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godot-screenshot

Launch the Godot editor and capture screenshots to visualize runtime behavior for game development benchmarking. Specify the project directory to start.

Instructions

Launch Godot editor on specified display and take a screenshot

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "project_dir": "<project_dir>"
    },
    "name": "godot-screenshot"
  }
}

Input Schema

Name	Required	Description	Default
`project_dir`	Yes	Path to the Godot project directory
`display`	No	No need to specify this, it will be automatically determined by the MCP server. Do not specify this if you are not sure about the display number.

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Mar 24, 2026

TDQS

C2.9/5.0

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. While it mentions launching the editor (a side effect), it fails to disclose critical behavioral traits: whether the editor process remains open after screenshotting, the output format/destination of the screenshot, cleanup behavior, or required environment setup.

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 with no redundant words. The action verbs are front-loaded, and every word contributes to understanding the tool's function.

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 (external process launch, GUI automation, image capture) and absence of output schema or annotations, the description is incomplete. It fails to specify the return value format (critical for an agent to use the screenshot) or side effect persistence (editor state).

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?

Schema coverage is 100%, establishing a baseline of 3. The description mentions 'specified display' (referencing the display parameter) and implies project_dir is used to launch that project, but adds no semantic information about valid formats, constraints, or the warning (from schema) that display should typically be omitted.

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 specific actions: 'Launch Godot editor' and 'take a screenshot'. However, it omits what happens to the screenshot (returned as data? saved to file?) and doesn't distinguish scope since there are no sibling tools.

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 versus alternatives, prerequisites (e.g., Godot installation), or when not to use it. The phrase 'specified display' contradicts the parameter schema which advises against specifying the display.

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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godot-screenshotC