Current time in zones

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

No annotations are provided, so the description carries the burden of explaining behavior. It discloses the default local+UTC result with no zones and enumerates accepted input formats. It does not describe output shape or ambiguity of abbreviations, but for a simple read-only time lookup this is reasonable transparency.

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?

The description is compact and efficient: the purpose is in the first sentence, input flexibility is second, and default behavior is third. Every sentence earns its place and no unnecessary detail is included.

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 single optional parameter with no annotations and no output schema, the description covers how to invoke it and what the default call returns. It does not specify the exact result structure, but the tool's simplicity and clear intent make it adequately 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?

The schema already describes the zones parameter and an example, so the baseline is 3. The description adds meaningful detail by listing the accepted forms — IANA zones, city names, country names, and abbreviations — and by stating behavior when the parameter is omitted. That goes beyond the schema's minimal description.

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 clearly states the specific verb and resource: it reports the current time in one or more places. It also clarifies accepted input types (IANA zones, city names, country names, abbreviations), which distinguishes it from sibling time tools like convert_time and overlap. This is enough for an agent to select it appropriately.

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 description gives clear usage context: use it for current time in one or more places, and explains the default behavior when no zones are provided. It does not explicitly name alternatives or exclusions, so it falls just short of full guidance.

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