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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds one genuinely behavioral detail beyond the annotations: matching is substring-based across names AND aliases. It says nothing about result limits, ordering, or empty-match behavior.

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 front-loaded sentence: verb, scope of results, matching rule, and target field. No filler, nothing 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?

For a one-parameter lookup tool without an output schema, the description tells an agent what to pass and what domain it searches, which is nearly sufficient. It does not describe the shape or size of the returned result set, a gap left open by the absence of an output schema.

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 0% and the single 'query' param has no description, so the description must carry the burden. It does explain what the query is matched against (country/subregion/region names and aliases) and that matching is substring, which is meaningful semantics absent from the schema.

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 gives a specific verb (find) and enumerates the exact resource types returned (countries, subregions, regions) plus the matching rule (name or alias substring). It also scopes the result to the base.location field. Siblings (feed/job tools) are unrelated, so no explicit differentiation is needed.

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 phrase 'for base.location' implies the context in which this lookup is useful, but there is no explicit when-to-use/when-not guidance and no named alternative for other location lookups. Usage is inferable rather than stated.

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