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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds genuine value by disclosing the return content (ranges, dates, sources), which matters since no output schema exists, but it says nothing about locality fallback behavior, data freshness, or caching.

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?

A single dense sentence that front-loads the resource and geographic scope before the parenthetical list of covered domains. No filler and nothing repeated, though the parenthetical enumeration is somewhat list-heavy.

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 carries the burden of describing results, and it does so only partially (ranges, dates, sources). Coverage of two optional parameters plus no output schema means a slightly richer description would help, but nothing critical for a correct invocation is missing.

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% and both parameters are documented there, so the baseline is 3. The description's category list loosely maps to the enum values (with FAMILY/LIFESTYLE rendered as 'education'/'leisure' rather than the actual enum names) and says nothing about the locality parameter's national-default behavior.

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 names a specific resource (typical monthly costs in Malta and Gozo) and enumerates the cost domains covered (housing, utilities, food, transport, healthcare, education, leisure), which are concrete and verifiable. There is no verb, and it does not distinguish itself from the sibling malta_statistics, so it falls short of a 5.

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 when-to-use guidance, no prerequisites, and no mention of alternatives such as malta_statistics or calculate_mprp_cost. The agent must infer that this is a reference/lookup tool from the phrasing alone.

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