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phaserjs

Phaser Editor MCP Server

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by phaserjs

get-system-instructions

Retrieves system instructions required for the LLM to structure arguments for tools like scene-add-game-objects and scene-update-game-objects. Must be called first.

Instructions

Get the system instructions. This is fully required for the LLM to know how to build the arguments of this MCP server tools. Tools like scene-add-game-objects, scene-update-game-objects, scene-add-game-object-filters, scene-update-game-object-filters, scene-add-plain-objects, and scene-update-plain-objects requires that the LLM get the system instructions first to know the tool arguments structure.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

No annotations are provided, so the description carries full burden. It only says 'Get the system instructions' without detailing behavioral aspects like permissions, side effects, or read-only nature. Minimal additional context beyond the tool name.

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?

Two concise sentences with no fluff. First sentence states purpose, second sentence explains necessity and dependencies. Every word earns its place, fitting for a simple tool.

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?

Given the tool's simplicity (no parameters, no output schema), the description adequately explains its role and when to use it. It could specify the return format or content, but the overall completeness is high for the context.

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 description coverage is 100%. Per guidelines, the baseline is 4. The description adds no parameter-specific information but is not required to.

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

Purpose5/5

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

The description clearly states the tool retrieves system instructions, which is a specific verb+resource. It distinguishes itself from sibling tools by explaining its unique prerequisite role for certain scene operations.

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

Usage Guidelines4/5

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

The description explicitly states that the tool is required for the LLM to build arguments for several listed tools, providing clear usage context. It does not include when-not-to-use or alternatives, but the prerequisite nature is well-communicated.

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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