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

Annotations already declare readOnlyHint=true and destructiveHint=false (consistent with this read-only description), so the safety bar is low. The description adds real context beyond the annotations by naming the returned fields (local time, offset, work-hour band) and disclosing the embedded https://timeofmeeting.com link, though it says nothing about invalid-city handling or failure modes.

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 tight sentences with zero filler, core behavior front-loaded in the first sentence and the notable return artifact (the meeting link) placed last where it belongs.

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?

An output schema exists, so return values need not be re-explained, and the description still usefully previews them. It is nearly complete for a simple read tool, with only minor gaps around edge-case behavior (unknown cities, ambiguous names).

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% and there is only one parameter, so the schema already fully documents the array-or-comma-separated input, the 1-8 city limit, and flexible spelling. The description adds no parameter-level detail beyond what the schema provides, making the baseline 3 appropriate.

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 ('Show') and resource ('current local time, offset, and work-hour band for each city'), which is immediately distinguishable from siblings like convert_time or find_best_meeting_time. However, it never names an alternative tool or explicitly contrasts its scope with them, so sibling differentiation is left to inference.

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 implied by the description (use this to get the present time in one or more cities), but there is no explicit when-to-use/when-not guidance, no mention of the search_cities prerequisite implied by the schema, and no exclusions relative to convert_time or find_best_meeting_time.

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