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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered without prose. The description adds useful behavior detail: it is a fuzzy free-text match and the response includes country, coordinates and population. It says nothing about match ranking, partial-match behavior, or what an empty result looks like.

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 sentence with zero filler, front-loading the input convention before the return shape. Nothing could be cut without losing information.

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, it correctly compensates by naming the returned fields (country, coordinates, population). For a simple two-parameter tool that is close to sufficient, but the unexplained required 'limit' and the absence of any note on result ordering or no-match behavior leave a meaningful gap.

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%, so the description must carry the parameter burden. It usefully clarifies that 'text' is free-form natural-language place input, but 'limit' — a required integer — is never explained: no maximum, no default, no guidance on result count. Half of the two-parameter surface remains undocumented.

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 verb-plus-resource is concrete: match free-text place names and return cities with country, coordinates and population. An agent can tell it is a geocoding lookup rather than a sensor or search tool. However, it never names a sibling or states how it differs from a broader lookup such as cells_find or mesh_search.

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 'type a place the way a person would' implies the use case: free-text, human-style place input rather than structured IDs or coordinates. There is no explicit when-to-use/when-not guidance, no mention of what to do if no city matches, and no routing to an alternative tool.

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