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

Annotations are all false and provide no safety profile, so the description carries the burden. It discloses the output structure (zone, local date, time, offset, UTC instant) and input flexibility, which is useful. However, it does not mention side effects, error handling, or behavior on invalid input. It does not contradict the annotations—it simply does not assert read-only—so the contradiction flag remains false.

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 concise sentences: the first states what the tool does and what it returns; the second lists accepted input formats. No redundant wording, key information is front-loaded, and every sentence earns its place.

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?

The description adequately explains the return value (zone, local date, time, offset, one UTC instant), which is crucial given there is no output schema. It also covers input types. It does not mention limits (e.g., maxItems) or error responses, but for a simple single-parameter tool, these are minor gaps. The tool is well-specified for an agent to call correctly.

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 with examples (['Warsaw','New York','India']) and has 100% coverage, giving a baseline of 3. The description adds meaning by specifying accepted formats beyond the schema: IANA zones, cities, countries, and abbreviations, which is valuable for an agent deciding what to pass. It thus adds value beyond the schema.

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 verb-like action (current time), the resource (one or more places), and the specific details returned (zone, local date, time, offset under one UTC instant). It also specifies accepted input types (IANA zones, cities, countries, abbreviations), which distinguishes it from sibling tools like convert_time (time conversion) and dst_changes (DST transitions).

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 implies it is for retrieving current time in multiple places, but it does not explicitly mention when to use this tool versus the sibling convert_time or dst_changes. No alternatives or exclusions are named, leaving the usage context implicit. The tool is simple enough that the purpose implies the use case, but explicit guidance would be clearer.

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