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 usefully adds that distances are straight-line rather than routed, that the radius is roughly 1.3 km, and attributes the OSM data source — but it says nothing about result ordering, empty-result behavior, or how the default radius is applied.

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 leads with the core output and scope, followed by the attribution line. The long parenthetical category list is dense but informative; nothing is wasted, though it could be trimmed since the schema repeats the categories.

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 does the work of explaining what comes back (places plus landmark distances), which is the key missing piece. It is close to complete for a read-only, zero-required-parameter tool; only default-radius and result-ordering behavior are unstated.

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 the schema already documents all three parameters including the category list and landmark examples. The description merely restates the same categories and landmark names, adding no syntax, defaults, or interaction rules beyond what the schema provides.

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 states precisely what the tool returns — named places within ~1.3 km plus straight-line distances to named landmarks — which is a specific resource with a stated scope. It is clearly distinct from the sibling tools (availability, guides, hostel facts), though it never explicitly names or contrasts them.

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?

There is no guidance on when to call this versus get_guide or get_hostel_facts, nor any note on prerequisites or typical query patterns. The content is described, but the conditions for selecting this tool are left entirely to inference.

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