Unity API Communicator MCP Server

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

With no annotations provided, the description carries full burden. It states this is a mutation operation ('Set'), but doesn't disclose behavioral traits like whether it requires specific permissions, what happens if the GameObject doesn't exist, whether changes are immediate or batched, or error conditions. The partial update hint ('Only provided fields are modified') adds some context, but significant gaps remain for a mutation tool.

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

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

The description is perfectly concise with two sentences that each earn their place. The first sentence establishes the core purpose, and the second adds crucial behavioral context about partial updates. No wasted words or redundant information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation tool with no annotations and no output schema, the description is adequate but incomplete. It covers the basic operation and partial update behavior, but lacks information about error handling, return values, performance characteristics, or integration with sibling tools. Given the complexity of GameObject manipulation, more context would be helpful.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents all parameters thoroughly. The description adds minimal value beyond the schema - it mentions that only provided fields are modified, which clarifies the partial update behavior, but doesn't provide additional semantic context about parameter interactions or usage patterns.

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

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

The description clearly states the specific action ('Set the transform') and resource ('GameObject'), with precise scope ('position, rotation, scale'). It distinguishes from siblings like gameobject_create or gameobject_delete by focusing on modifying existing objects rather than creating or deleting them.

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

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

The description implies usage for modifying GameObject transforms, but provides no explicit guidance on when to use this versus alternatives like gameobject_active or gameobject_layer. It mentions 'Only provided fields are modified' which hints at partial updates, but doesn't specify prerequisites or exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.