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

Annotations already cover readOnly/openWorld safety, so the bar is lower, and the description still adds real behavioral context: the summary fields, verification dates, legal citations, and the warning that full profiles can be large (a performance cue). It does not discuss auth needs or rate limits, but the content and size hints go well beyond the annotations.

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?

Front-loaded with "Everything on one country" and then a labeled summary followed by a structured "Then:" list. It is dense and long, but since there is no output schema the enumeration of available fields largely earns its place rather than being padding.

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 only 50% schema coverage, the description carries the burden of explaining what comes back and does so thoroughly, listing every section and the summary contents. An agent knows both what to send and roughly what to expect, leaving only minor gaps like response size specifics.

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 coverage is 50%: country has a description while the topics enum does not. The description nonetheless maps content areas to topics ("visas", "years from residency to citizenship", "tax blacklist status"), adding meaning about what narrowing by topics yields. Baseline 3 is appropriate given partial schema coverage.

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 verb+resource (get one country's profile) and enumerates the exact content returned, from visa minimums to passport power. It clearly distinguishes itself from compare_countries by being single-country scoped, though it never names a sibling tool explicitly.

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 line "Pass topics to narrow it; full profiles can be large" gives practical guidance on the topics parameter and hints at when to narrow. However, there is no explicit guidance on when to use this tool versus compare_countries or find_visas, so the usage context is only implied.

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