UUID v4

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

With no annotations supplied, the description carries the full burden: it does disclose the key behavioral trait that output is random (non-deterministic) and version 4, which is what matters here. It does not state side-effect freedom or repeated-call behavior (a new value each time), which are the traits an agent might still need clarified.

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?

A single short sentence with the actionable verb and the version qualifier front-loaded; every word earns its place and nothing is padded.

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 no annotations and no output schema, the description covers what the tool does and that the result is random v4. It stops just short of stating the return type (a string) and that each invocation yields a distinct value.

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 takes zero parameters, so there is nothing for the description to disambiguate and the baseline of 4 applies. No parameter constraints are missing.

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?

States a specific verb and resource ('Generate a ... UUID v4') with the exact variant specified, so an agent knows precisely what comes back. It is trivially distinguishable from the sibling utilities 'echo' and 'now'.

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 implied — an agent needing a fresh unique identifier should call this rather than 'now' or 'echo'. No explicit when-to-use or when-not framing, and no alternatives are named, but for a single-purpose utility the implication is unambiguous.

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