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

With no annotations, the description carries the burden and does well: it discloses conditional return behavior, includes open-now status, and warns that holidays may differ. It does not state read-only/auth/rate-limit details, but for this simple informational tool the disclosed behavior is substantial.

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?

Compact and front-loaded: location/timezone first, then dated vs undated behavior, then holiday caveat. Every sentence adds useful context without waste.

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-optional-parameter informational tool with no output schema and no annotations, the description is complete enough: it explains return modes, timezone, open-now behavior, and holiday caveat. No critical invocation detail is missing.

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 coverage is 100%, so baseline is 3, but the description adds real meaning about what the date parameter changes: dated calls return that day's hours plus lunch/brunch/happy-hour/early-bird windows, while omitting it returns today and the weekly schedule. The schema already says omit for today/week, but the description explains the dated result more fully.

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?

Clearly states the resource (opening hours of Sole Mio) and timezone, and explains the two result modes: dated vs undated. It does not explicitly distinguish itself from siblings like get_early_bird, even though it mentions early-bird windows, so it stops short of a 5.

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 clear conditional usage: provide a date to get that day's hours and dining windows, omit it for today, open-now status, and the weekly schedule. It does not name alternative siblings or exclusions, so it is clear but not fully comparative.

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