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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds the useful behavioral detail that the tool returns a restriction message, but it does not describe error behavior, edge cases, or how open-world results should be interpreted. This is adequate but not rich.

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?

The description is very short and contains no filler. It front-loads the core purpose and includes the restriction-message output detail in a compact phrase. The wording is slightly awkward as a sentence fragment, but it is efficient and easy to parse.

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 simple read-only tool with fully documented parameters, annotations, and an output schema, the description is mostly complete. It captures the essential purpose and output nuance. The main gap is the lack of explicit routing among shipping-related sibling tools, but the country-level scope in the description makes the intended use reasonably clear.

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 both country_code and locale are already well documented. The description mentions 'country' but does not add parameter-level meaning beyond the schema, such as how locale interacts with the restriction message. Baseline 3 is appropriate.

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 clearly states what the tool evaluates: whether Camden Tools ships to a given country, with any restriction message. It identifies the specific resource (country-level shipping availability) and implicitly distinguishes itself from siblings like estimate_delivery or check_express_eligibility, though it does not name them or use an imperative verb.

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 use case is implied: call this tool when the agent needs to know whether Camden Tools ships to a country and what restrictions apply. However, there is no explicit guidance contrasting it with related siblings such as check_express_eligibility or estimate_delivery, so the agent must infer when this tool is the right choice.

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