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

Annotations already declare readOnlyHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The word 'nearest' is the only added behavioral signal, implying approximate rather than exact matching, but accuracy, rate limits, and failure behavior for invalid coordinates are 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?

A single front-loaded sentence that defines the input-output relationship with zero filler. Slightly terse given the total absence of schema descriptions, but not padded or redundant.

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?

No output schema exists, and the description does say the return is 'the street address', which covers the return value at a minimal level. Still missing coordinate precision assumptions, formatting of the returned address, and behavior when no address is found.

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 0% and the description only says 'a coordinate' without explaining that lat/lng are decimal degrees, their valid ranges, or their order. lat/lng naming is conventional, but the description does not compensate for the schema's total lack of parameter documentation.

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 names the operation (coordinate → nearest street address) with enough specificity that an agent can distinguish it from the forward sibling geocode_address. It never names that sibling explicitly, so the contrast is inferred rather than stated.

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 parenthetical '(e.g. where a technician's last position is)' hints at one scenario, but there is no explicit when-to-use, when-not-to-use, or pointer to alternatives such as geocode_address or nearest_technicians/zones_for_location.

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