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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered; the description adds genuinely non-obvious domain behavior — morning/afternoon windows, Mon/Wed/Fri mornings-only, Saturday closed, and that whole_day filters the result set to fully-open days. It stops short of saying what a returned entry looks like (per-day? per-slot?).

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 sentences, front-loaded with the core purpose before the schedule constraints and the whole_day rule. The middle semicolon chain of opening rules is dense but each clause is operational information an agent cannot infer, so little is wasted.

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?

With no output schema, the description carries the return-value burden and mostly meets it — it implies the result is a list of days (or days/times) that are open, filtered by whole_day. It is complete enough to call correctly, though the exact shape of a returned slot versus a returned day remains implicit.

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 both parameters are already documented, including the whole_day rationale and the days maximum/minimum. The description adds only the downstream effect of whole_day ('only days with the whole day open are listed') and says nothing extra about the days window beyond the schema's default of 14. 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 ('Open visit times in the next days') plus concrete scope (Jacksonville time, next N days). The business-hours rules make it unmistakably a read-only availability lookup, distinguishing it from book_visit and get_services without needing to name them.

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?

Gives a clear conditional rule for switching behavior: 'Set whole_day true for The Full Package or more than one car.' This tells the agent exactly when to use which mode, though it never states the implied relationship to book_visit (e.g., call this first, then book) or any exclusions.

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