APIbase

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

With no annotations provided, the description carries the full burden and successfully discloses key behavioral traits: DST-awareness, no authentication required, free usage, and unlimited rate limits (TimeAPI.io).

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 two concise sentences/fragments with zero waste. It front-loads the core purpose (getting current time) and follows with behavioral constraints (DST, auth, limits).

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-parameter tool with no output schema, the description adequately covers the return value semantics (date, time, day of week) and operational constraints. It could be improved by indicating the response format, but is otherwise 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?

With 100% schema coverage, the baseline is 3. The description adds value by reinforcing the IANA timezone format and explicitly stating the tool is 'DST-aware', indicating how the timezone parameter handles daylight saving transitions.

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 uses specific verbs ('Get') and resources ('current date, time, and day of week') and explicitly scopes the tool to 'current' time for 'IANA timezone', clearly distinguishing it from sibling tools time.worldclock.convert and time.worldclock.zones.

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 provides clear context for when to use the tool (retrieving current time for a timezone), but does not explicitly mention alternatives or exclusions (e.g., when to use convert vs current).

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