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phaserjs

Phaser Editor MCP Server

Official
by phaserjs

scene-get-screenshot

Capture a screenshot of a specific area within a game scene by providing coordinates and dimensions.

Instructions

Get a screenshot of the scene.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
xYesThe x coordinate of the top left corner of the screenshot.
yYesThe y coordinate of the top left corner of the screenshot.
widthYesThe width of the screenshot.
heightYesThe height of the screenshot.
sceneIdYesThe `id` of the scene. The `id` is not the name of the scene, else a unique identifier is set in the scene data. You need to read the scene data to get the `id`.
Behavior2/5

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

With no annotations, the description bears full responsibility for behavioral transparency. It does not disclose any side effects, error handling, output format, or requirements (e.g., if the scene must be visible). This is insufficient for a tool with no annotation support.

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

Conciseness4/5

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

The description is a single, clear sentence with no unnecessary words. However, it could benefit from adding structured information about output or behavior without sacrificing brevity.

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?

Despite good schema descriptions, the tool lacks output schema and the description omits critical context such as coordinate system (pixels or relative), image format, and response behavior. This leads to an incomplete understanding for agents.

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, with detailed explanations for each parameter (e.g., sceneId explains it is not the name). The tool description adds no extra parameter context, so the baseline score of 3 applies.

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 tool retrieves a screenshot of a scene, providing a specific verb and resource. It distinguishes itself from sibling tools as the only screenshot-related tool, though it could be more precise about the output format.

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, nor are there any preconditions or exclusions mentioned. The description lacks context for decision-making.

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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