Unity API Communicator MCP Server

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

No annotations are provided, so the description carries the full burden. It discloses key behavioral traits: 'read-only' (indicating no mutations) and 'no parameters required' (simplifying usage). However, it doesn't cover aspects like response format, potential rate limits, authentication needs, or what 'endpoints' specifically refers to (e.g., API endpoints, tool endpoints). The description adds basic context but leaves gaps in behavioral details.

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 extremely concise and front-loaded: a single sentence that efficiently conveys purpose, behavior, and category. Every word earns its place, with no redundancy or unnecessary elaboration, making it easy for an AI agent to parse quickly.

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?

Given the tool's low complexity (0 parameters, no output schema, no annotations), the description is minimally complete. It covers the core purpose and basic behavior but lacks details on output (e.g., format of discovered endpoints) and broader context (e.g., how this fits with sibling tools). For a discovery tool, more information on what 'endpoints' entails would enhance completeness, but it's adequate for the simple structure.

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?

The input schema has 0 parameters with 100% coverage, so no parameter documentation is needed. The description reinforces this with 'no parameters required', which adds clarity beyond the empty schema. Since there are no parameters, the baseline is 4, as the description adequately addresses the lack of inputs.

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 tool's purpose: 'Discover all endpoints' with the qualifier 'read-only, no parameters required'. It specifies the verb ('discover') and resource ('endpoints'), and includes the category '[Category: discovery]' for context. However, it doesn't explicitly differentiate from sibling tools like 'project_info' or 'status', which might also provide discovery-like information, though the 'all endpoints' scope is specific.

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 by stating 'no parameters required', suggesting it's a straightforward call for endpoint discovery. However, it doesn't provide explicit guidance on when to use this tool versus alternatives (e.g., 'project_info' for project details or 'status' for system status), nor does it mention prerequisites or exclusions. The context is clear but lacks comparative direction.

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