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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only restates the result ('total credits spent') and does not mention whether the total is all-time or date-bounded, whether the operation is read-only, or how missing or invalid agent IDs are handled.

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 one short, front-loaded sentence with no filler, making it efficient and easy to parse. However, it is arguably under-specified; the conciseness is a strength, but the minimalism sacrifices useful guidance.

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?

With no output schema and no annotations, the description leaves unclear what the response looks like (e.g., raw number, formatted string, credits vs. currency) and what time period the total covers. The abundance of credit-related sibling tools makes the lack of differentiation and usage guidance a meaningful gap.

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 schema has no description for agent_id and parameter coverage is 0%, so the description must compensate. It never clarifies that agent_id is the identifier of the agent whose spend is returned, what format it should take, or how to obtain it, leaving semantics mostly to the parameter name.

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 states that the tool returns the total credits spent by one agent, which names a specific resource and metric. However, it does not distinguish this tool from the similarly named sibling get_credit_usage_by_agent, so it stops short of full sibling differentiation.

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?

There is no guidance on when to use this tool versus alternatives such as get_credit_usage_by_type, get_credit_usage_monthly, or get_credit_usage_by_agent. The phrase 'one specific agent' implies a use case, but no explicit conditions, exclusions, or alternatives are provided.

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