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

Annotations already declare readOnlyHint=true, so "Read-only" is redundant, but the description adds two things the annotations don't: the returned data is sampled ("a few values from each"), signalling that full records require get_features, and the coordinate refers to a studied place rather than the caller's location. Return shape, pagination and layer counts remain unstated.

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?

One substantive opening sentence carries the scope and output categories, front-loaded before the two short follow-ups. The layer enumeration is a little dense but each clause adds information; nothing is padding.

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 compensates by naming the layer families and noting that only a few values per layer come back, which is enough to set expectations. Only the absence of any guidance on sibling choice and result size keeps it below a 5.

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 100%, so the baseline is 3; the description earns an extra point by interpreting the lat/lon pair as "a point on the sea (a place being studied, not the user's location)", which disambiguates a genuine ambiguity not resolved by the schema's plain "Latitude of the place".

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?

States a specific verb and resource (list Biohotspot map layers) with an explicit spatial scope and enumerated layer categories (habitats, wildlife, human uses, protected areas, world ocean maps). It does not distinguish itself from close siblings like look_in_area, understand_area, or find_layers, so an agent cannot tell from this text alone which of those to pick.

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?

"Use it to learn what a place holds" implies a reconnaissance use case, which is helpful framing. But there are no exclusions, no prerequisites, and no named alternative despite several neighbouring tools (look_in_area, understand_area, get_features) that plausibly overlap.

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