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 only the upstream REST route (GET /v1/geocode/autocomplete), which is developer trivia rather than behavioral context; nothing is said about result shape, scoring, or rate/billing behavior on a billed API.

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 tightly written sentences with the purpose front-loaded before the implementation detail. The trailing REST endpoint clause is the one piece that doesn't materially help an agent decide or invoke, slightly diluting an otherwise waste-free description.

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 read-only, single-required-parameter lookup whose entire input surface is documented in the schema, this is nearly complete. With no output schema, a brief note on what the suggestions look like would have closed the remaining gap.

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 every one of the 7 parameters (bias, lang, type, limit, filter, format, text) is already documented in the schema with examples. The description adds no syntax or semantics beyond that, 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 and resource ('suggest completed addresses/places') scoped to a partial query, which implicitly separates it from geoapify_geocode_search's full-query lookup. However, no sibling tool is named, so the agent must infer the boundary rather than being told.

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?

'ideal for as-you-type inputs' gives clear situational context for when this tool is the right pick, and the 'partial query' framing implies the counterpart case (complete addresses → search). There are no explicit exclusions or named alternatives, keeping it short of a 5.

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