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

readOnlyHint=true already tells the agent this is a safe, non-mutating read. The description adds the HTTP method and path (GET /v1/geocode/reverse), a small but useful behavioral detail. No annotation contradiction; with the safety profile already covered, this is adequate without being rich.

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?

Two short clauses with zero filler; the core purpose is front-loaded before the endpoint reference. Every element earns its place.

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 simple read-only lookup the essentials are covered, but with no output schema the description could have sketched the response shape and, given six parameters, mentioned defaults ( format, result limit). It is minimally complete rather than thorough.

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% and all six parameters (lat, lon, lang, type, limit, format) are documented in the schema itself. The description adds no syntax, default, or format detail beyond what the schema already provides, so the baseline 3 applies.

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+resource ('turn coordinates into the nearest address / place') plus the exact REST endpoint, so the agent knows precisely what the tool does. The word 'reverse' cleanly distinguishes it from the forward-geocoding siblings geoapify_geocode_search and geoapify_geocode_autocomplete.

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 'coordinates into address' framing implies usage (call it when you already have lat/lon), but there is no explicit when-to-use, when-not, or naming of alternatives such as the forward-geocode siblings. An agent can infer the context but must reason about routing itself.

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