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

No annotations are provided, so the description is the sole source of behavioral context. It adds useful information about the data source and that no API key is required, which is helpful. However, it does not disclose potential rate limits, response format, or details about the available fiscal year range, leaving some behavioral ambiguity.

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 a single sentence followed by a source note. It is front-loaded with the core action and stays within two lines, eliminating any waste. Every piece of information is relevant.

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 has no output schema and no annotations, so the description must explain what to expect. It mentions the data source and the resource type, but it does not describe the response structure or the meaning of 'period.' Given the tool's simplicity, this is a minor gap, but still leaves room for ambiguity.

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 no parameters, and the baseline for zero parameters is 4. The description adds no parameter-specific semantics because there are none, but it correctly implies the tool returns a complete dataset. This is sufficient given the empty schema.

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 total US federal budgetary resources (spending authority) by fiscal year and period, which is a specific resource. This distinguishes it from sibling tools like usaspending_awards, which deals with awards. The verb 'Get' and precise resource make the purpose unambiguous.

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. It does not mention exclusions or recognize when a user should prefer usaspending_awards or other budget-related tools. The only implied context is that it is for federal budget totals, but there are no explicit usage directives.

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