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

No annotations exist, so the description must carry the full behavioral burden. It discloses absolutely nothing — no side effects, no return-shape, no semantics of 'relative time' (duration? formatted string? date offset?). The description adds zero behavioral context.

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 text is short but this is under-specification, not conciseness. A repeated noun phrase instead of a sentence wastes the slot and earns no structure credit.

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?

Even though the tool is simple (0 params), the description provides no information about what the tool returns or when an agent should select it over near-identical siblings. The definition is wholly inadequate for correct tool selection.

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 input schema has zero parameters and a 100% coverage baseline, so there is nothing the description needs to document. Per the rubric, 0 params earns a baseline of 4: the empty schema is fully self-explanatory.

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 'Relative Time: Relative Time' is a pure tautology — it restates the tool name in both label and body without any verb, resource, or behavior. With dozens of time-related siblings (time-ago, time-until, elapsed-time, duration-humanize), an agent cannot tell what this tool computes or returns.

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?

No guidance is given about when to use this tool versus the many overlapping siblings. There is no stated input expectation, no context, no exclusions, and no alternative routing is provided.

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