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

Annotations already declare readOnly=true, idempotent=true, non-destructive and closed-world, so safety is covered. The description adds nothing about the calculation's behavior, required inputs, units, precision, or error conditions beyond the pointer to describe_operation; repeating the URL twice adds no context.

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?

Extremely short, but the opening sentence is duplicated verbatim, and no real information is front-loaded. Brevity here reflects under-specification rather than conciseness.

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?

For a tool with zero schema description coverage, no output schema, and nested untyped parameters, the description leaves the agent unable to form a valid request without first calling describe_operation. Nothing about the calculation domain (prime rate input, periods, output shape) is conveyed.

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?

Schema description coverage is 0% with two nested-object params (query, params) and no enum hints, so the description must compensate. It only says describe_operation exposes native request schemas, giving no meaning to the query or params objects or their expected contents.

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 is essentially the endpoint path restated twice ('GET /api/economic-data/prime-rate/calculate'), which is tautological with the tool name. It never says what 'calculate' does (compute a prime-rate-based figure? what inputs/outputs?) or how it differs from the sibling prime_rate_current, prime_rate_history or the cpi_calculate tool.

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?

No when-to-use, when-not-to-use, or alternatives are given. The only actionable sentence points the agent at describe_operation for native request schemas, which is a retrieval hint rather than selection guidance.

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