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

Annotations already declare read-only, idempotent, non-destructive, closed-world. Beyond that the description adds genuinely useful behavioral context: data is updated daily, sourced from Agregator.ro, results are ranked by estimated total cost for the given amount and term, and the response is in Romanian.

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?

Two sentences, resource and scope front-loaded, no filler. The long enumeration of returned fields is dense but each item earns its place by telling the agent what comes back.

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, the description compensates well by naming the returned values (rate, rate type, DAE, monthly payment, IRCC/ROBOR/EURIBOR), the ranking criterion, the data source and freshness, and the language. Only the absence of explicit sibling routing keeps it from a 5.

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 100%, so the schema already documents every parameter including defaults and enums. The description reinforces the loan-type vocabulary and the amount/term ranking, but adds no syntax or format detail beyond the schema. Baseline 3 applies.

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?

States a specific resource (Romanian bank loan offers from Agregator.ro) and enumerates the covered loan types (personal, mortgage, refinancing, Noua Casă, car), which clearly distinguishes it from the deposit-rate sibling. It does not explicitly name the sibling tools, but the domain is unmistakable.

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 or when-not guidance, and no routing to alternatives. The reader must infer from the resource name that this is for loan offers rather than curs_bnr or dobanzi_depozite; the description never addresses the choice.

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