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o3de-mcp

o3de-mcp

by nickschuetz
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

register_engine

Registers an O3DE engine installation with the O3DE manifest by providing the engine root path.

Instructions

Register an O3DE engine installation with the O3DE manifest.

Args: engine_path: Path to the engine root directory (must contain engine.json).

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": {
      "engine_path": "<engine_path>"
    },
    "name": "register_engine"
  }
}

Input Schema

NameRequiredDescriptionDefault
engine_pathYes

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.3.0

TDQS

A3.8/5.0
Behavior2/5

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

With no annotations available, the description carries the full burden of behavioral disclosure. It mentions that engine_path must contain engine.json but does not explicitly state the side effect of modifying the manifest, whether registration is idempotent, or whether write permissions are needed.

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 compact and front-loaded with the core purpose. The Args section is directly useful and contains no filler or redundant information.

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?

For a single-parameter tool, the description is largely complete: it names the action, target, and required parameter constraint. With an output schema present, return-value details are not necessary, though a brief note on manifest mutation would improve it further.

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 schema itself provides only the parameter name and type, so the description's Args section adds meaningful detail: 'Path to the engine root directory (must contain engine.json)'. This compensates for the 0% schema description coverage.

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 action ('Register') and the resource ('an O3DE engine installation with the O3DE manifest'). This distinguishes it from the sibling register_gem tool, which operates on gems rather than engine installations.

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

Usage Guidelines3/5

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

The description implies usage by naming the resource and the required engine.json condition, but it does not explicitly state when to prefer this tool over alternatives such as register_gem or set_active_engine. Some context is present but no exclusions or alternative routing are provided.

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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