get_current_datetime

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

No annotations are provided, so the description carries full responsibility for disclosing behavioral traits. It does state the return format and that the tool returns a value, which implies a read-only operation, but it does not explicitly mention absence of side effects, authentication requirements, or reliability characteristics. This is a gap 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?

The description is a single, front-loaded sentence with no wasted words. It efficiently conveys the operation, scope (local and UTC), and format (ISO 8601) without 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 zero-parameter utility with an output schema present, this description is complete. It specifies the output format, and the output schema will handle the exact return structure. Nothing an agent needs to invoke this tool correctly appears to be missing.

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 tool has zero parameters, so the baseline for this dimension is 4. There is no parameter information to add, and the description appropriately avoids inventing semantics for parameters that do not exist.

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 a specific verb ('return'), a clear resource ('current local and UTC date/time'), and an exact output format ('ISO 8601'). It is distinct from all sibling tools, none of which are date/time related, so an agent can easily identify what this tool does.

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 usage: use this when you need the current date/time in ISO 8601. However, it does not explicitly state when to use it, nor are there any alternative datetime tools among the siblings to differentiate from. The context is clear enough but entirely implied.

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