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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety and world-scope are covered. The description adds the closed-world constraint that coverage is limited to MT and that the response resolves an office, but it says nothing about failure behavior or what 'not served' looks like. Modest added value over the annotations.

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 with no filler; every clause (business, scope, outcome) carries information.

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 one-parameter read tool with full schema coverage and annotations covering safety, the description is nearly sufficient and hints at return semantics (served/not served, covering office). Only the ambiguity of unserved cities and its relationship to the appointment siblings keeps it short of complete.

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% ('City of the service address'), so the schema already carries the parameter meaning. The description only adds the implicit MT scope for the city value. Baseline 3 is appropriate when the schema does the heavy lifting.

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?

Specific verb (check) plus resource (service area) plus a named business and geographic scope (MT), and it even states the outcome dimension ('which office covers it'). None of the siblings (get_available_times, get_business_info, request_appointment) could be confused with this lookup, so differentiation is achieved by domain specificity even without naming a sibling.

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?

Usage is only implied: an agent can infer this is a pre-booking eligibility check, but the description never says when to call it, whether it should precede request_appointment, or what to do when a city is not served. No exclusions or alternatives are stated.

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