get_credits

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

The description adds the useful behavioral trait that the operation is 'Free' (does not consume credits) and implies a read-only balance check. However, with no annotations provided, the description carries the full burden for behavioral disclosure, and it does not mention response format, error conditions, or authentication requirements. This is acceptable for a simple getter but leaves some gaps.

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 two concise sentences: the first states the purpose, the second adds key gratuitous information ('Free'). There is no fluff, and it is front-loaded with the verb and resource.

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 simplicity (no parameters, no output schema), the description is complete enough. It specifies what is returned ('remaining credit balance and API limits') and adds the 'Free' context. Sibling tools are clearly different, so there is no confusion about the tool's role. No further context is needed.

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 tool has zero parameters, so the input schema is empty and schema coverage is 100%. Per the rubric, a baseline of 4 applies when there are no parameters. The description does not need to explain parameter semantics and does not add anything beyond what the schema provides.

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 verb 'Get' and the resource: the user's remaining TrackTag credit balance and API limits. It also adds 'Free' to signal that this operation does not consume credits, which distinguishes it from sibling tools like analyze_track or analyze_url that presumably consume credits.

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 provides no explicit guidance on when to use this tool versus alternatives. There is no mention of prerequisites, typical scenarios, or exclusions. The 'Free' note implies it could be used to check limits before other operations, but this is not stated explicitly.

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