APIbase

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

With no annotations provided, the description carries the full burden. It successfully discloses key behavioral traits: DST-awareness (critical for timezone conversion accuracy) and scope limitations ('597 IANA timezones'). It also cites the data source '(TimeAPI.io)'. Missing only minor details like error handling for invalid zones.

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 efficiently front-loaded with the core action ('Convert date/time...') followed by key qualifiers ('DST-aware', timezone count, source). While highly compact with three sentence fragments, it wastes no words. Slight deduction for being somewhat telegraphic rather than flowing prose.

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?

Given the tool's low complexity (simple utility with 3 parameters, no nested objects) and lack of output schema, the description provides sufficient context. It covers the essential operational characteristics (DST handling, supported timezone count) that an agent needs to invoke the tool correctly, though it could mention the return format.

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%, with clear descriptions for all three parameters (from_timezone, datetime, to_timezone). The description does not add significant semantic detail beyond the schema, but does imply the relationship between parameters through the conversion explanation. Baseline 3 is appropriate given high schema coverage.

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 states the specific action ('Convert') and resource ('date/time') clearly. It distinguishes from siblings like 'time.worldclock.current' (which gets current time) by emphasizing the conversion functionality between zones, and from 'time.worldclock.zones' by focusing on the conversion operation rather than listing.

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 the usage scenario (converting a specific datetime between zones) through the action verb, but provides no explicit guidance on when to use this versus 'time.worldclock.current' for retrieving current time, or versus 'time.worldclock.zones' for browsing available zones.

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