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

No annotations are provided, so the description carries the full burden. It discloses the kind of information returned (summaries of landmarks), instructs against redundant calls ('DO NOT iterate...'), and specifies constraints (max radius 10,000m, max 50 results). It could be more explicit about potential side effects or authentication needs, but for a read-only search tool, the description is sufficiently transparent.

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 well-structured with clear sections (general purpose, USE FOR, NOT FOR, additional instructions). It is appropriately sized, with every sentence serving a purpose. However, the 'DO NOT iterate' instruction could be integrated into the guidelines section, slightly reducing redundancy. Overall, 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?

Given the tool has 5 parameters and no output schema, the description provides adequate context: it explains the output type (summaries of landmarks), usage patterns, and constraints. It could specify the exact output format (e.g., text, structured fields) but the examples and instructions for composing a summary sufficiently guide the agent. The description covers all necessary behavioral aspects for a smooth interaction.

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 baseline is 3. The description adds minimal meaning beyond the schema: it implies the lat/lon define a search center and the dist/limit/timeout are flexible, but these details are already in the schema. The usage examples provide context for lat/lon, but no new semantic information is added.

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 the tool finds info about notable/historic landmarks, towns, and remarkable sites near a coordinate. It uses specific verbs ('Find info') and a well-defined resource ('landmarks, towns, and remarkable sites near a coordinate'). This distinguishes it from sibling tools like geo-geocode or geo-reverse, which serve different purposes.

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 description provides explicit use cases under 'USE FOR' (e.g., 'What's near Predjama Castle?') and clear exclusions under 'NOT FOR' (e.g., directions, finding specific cafes/shops, raw geocoding). It also advises against iterating over results and instructs the agent to combine results into a single summary. This gives excellent guidance on when and how to use the tool versus alternatives.

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