get_user_limits

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

The description implies a read-only operation ('retrieve', 'check') but does not explicitly state behavioral traits such as nondestructive nature, authentication requirements, or rate limits. Since no annotations are provided, the description carries the full burden, and while adequate, it could be more explicit about what the tool does not do.

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, using two short sentences for the core purpose and a bullet-style 'Use when' list. Every sentence adds value with no redundancy, and the main purpose is front-loaded.

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?

The tool is simple with one parameter and the description covers its purpose and typical use cases. An output schema exists, so return value details are not needed. The description provides sufficient context for an agent to understand when and how to use this tool.

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 fully describes the single optional 'api_key' parameter with 100% coverage. The description adds no additional semantics beyond the schema, so the baseline score of 3 is appropriate.

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 retrieves 'plan features and current usage limits' for the API key. The verb 'retrieve' and specific resource make the purpose unambiguous, and it stands apart from sibling tools that perform queries, jobs, or dataset operations.

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 includes explicit 'Use when' scenarios: checking plan allowances and verifying usage before large jobs. This provides clear context for when to invoke the tool, though it does not mention when to avoid using it or name specific alternatives among siblings.

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