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

No annotations provided, so description carries full burden of behavioral disclosure. States it retrieves current time but fails to specify return format (ISO string? Unix timestamp? Object?), timezone handling (DST?), or error behavior for invalid coordinates. Minimal disclosure for a tool with zero annotation coverage.

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 short sentences, front-loaded with core purpose. Minor redundancy between 'current local time' and 'what time it is right now,' but otherwise efficient 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?

Tool has low complexity (1 param, simple concept) and good schema coverage, but lacks output schema. Description omits return value format which would help the agent understand what to expect from the call. Adequate but incomplete given the missing output specification.

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 has 100% description coverage for the single parameter, documenting the coordinate format and providing an example. Description mentions 'location' generically but does not add semantic value beyond what the schema already provides (e.g., doesn't clarify that it must be coordinates rather than city names). Baseline 3 appropriate given schema completeness.

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?

Specific verb ('Get') + resource ('local time') + scope ('US location'). Clearly distinguishes from weather-focused siblings (get_current_weather, get_weather_forecast, etc.) by explicitly targeting time rather than meteorological data.

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?

Implies usage context by restricting to 'US location' twice, establishing geographic scope. However, lacks explicit when-to-use guidance relative to weather siblings or alternative time-lookup methods, and omits exclusions (e.g., what happens with non-US coordinates).

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