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

Annotations already declare readOnlyHint, idempotentHint, and a closed-world lookup, so the safety profile is covered. The description adds a useful behavioral trait — each fact is attributed to an official source — but says nothing about freshness, rate limits, or what happens for an unrecognized country, so it only modestly extends 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?

It is a single front-loaded sentence that leads with the resource and then lists the returned facts without filler. The long enumerative tail is dense but every item is a distinct field, so nothing is wasted.

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 return-value burden and does so well by naming each fact returned and noting source attribution. Minor gaps remain — no mention of whether unknown countries or partial data are handled — but for a one-parameter read tool this is nearly complete.

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 the single country parameter is already documented as accepting Hebrew, English, or a slug. The description only restates that a destination country is the input, adding no format or matching-rule detail beyond the schema, so the baseline of 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?

The description names a specific resource (destination country facts) and enumerates exactly which facts it returns: price class, entry insurance requirement, NSC travel warning level, emergency numbers, and the Israeli mission. This clearly separates it from siblings like age_rules, condition_rules, coverage_limits, and quote_trip, which cover other insurance dimensions.

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?

Usage is only implied: the returned fields (warning level, entry requirements, emergency numbers) suggest a pre-trip / destination-check context, but the description never says when to use this versus quote_trip or coverage_limits, nor any exclusions or prerequisites. It gives an agent enough to guess the intent, but not explicit routing guidance.

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