Current time

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

No annotations are supplied, so the description carries the behavioral burden; it implicitly conveys a harmless read of the clock, which is the main thing an agent needs. However, it says nothing about the returned format (ISO 8601? offset included? precision?) and there is no output schema to fill that gap.

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?

One sentence, front-loaded with the resource and immediately followed by the qualifier (time zone) with concrete examples. No filler or redundancy.

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 one-optional-parameter clock tool this is close to sufficient: the resource and the parameter meaning are both covered. The only meaningful gap is the shape of the returned timestamp, which matters because no output schema exists.

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% and the single parameter already documents the IANA zone with an example, so the description adds nothing new. It also omits the schema's UTC default, which is the one piece of semantics a caller might otherwise miss.

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 names the exact resource (current date and time) and its scope (an IANA time zone), so an agent knows precisely what it returns. It does not explicitly distinguish itself from the siblings echo/uuid, but those are unrelated utilities so confusion is unlikely.

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?

Usage is only implied: an agent infers it should call this whenever it needs the current time, and the mention of a time zone hints that the zone should be supplied. There is no explicit statement of when to prefer this over computing time elsewhere, nor any exclusion or precondition.

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