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

With no annotations, the description carries the full burden. It usefully discloses the 50-point cap, which is a real batch constraint, and the word 'reverse-geocode' implies a read-only operation. However, it says nothing about rate limits, per-call cost/credits for a PRO tool, or failure behavior when a point is invalid.

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 tight sentence with the defining constraint (batch size) front-loaded, plus a tier tag. Nothing is wasted, though 'PRO.' is unexplained noise to an agent.

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 tool whose primary input is a structured array and with no output schema, the description omits both the per-point object shape and any indication of what the response contains. An agent could form the call but not confidently build the points array.

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 only 50%: access_token is documented in-schema, but 'points' is an untyped array of bare objects with no field structure anywhere. The description does not explain what each point object must contain (lat/lon keys, ordering), so the most important parameter is left ambiguous.

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 (reverse-geocode) and resource (up to 50 lat/lon points), with the batch cap of 50 made explicit. It is distinguishable from siblings by the 'batch' framing, but never names reverse_geocode or reverse_with_elevation to make the contrast explicit.

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 'up to 50 points' phrasing implies this is for multi-point lookups rather than single lookups, but it never states when to prefer it over reverse_geocode or reverse_with_elevation. The 'PRO.' prefix hints at a premium/subscriber tier without explaining any gating condition.

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