generate_uuid

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It specifies that generation uses random or pseudo-random numbers, that the UUID contains no host/time/MAC information, and it explicitly documents the return type and format. This exceeds what a basic 'Generate UUID' would convey.

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 compact and front-loaded, with the core purpose in the first sentence. It includes only essential details: the generation mechanism, privacy property, and return format. Every sentence earns its place 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?

Despite being a simple tool, the description is fully complete. It explains what the tool does, how it works, and what it returns. Given that there is an output schema, the explicit return type example is a bonus but not strictly necessary. No missing information for a tool of this complexity.

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 is 4 per the rubric. The description adds no parameter information because none exists; it appropriately focuses on the output and behavior instead.

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 clearly states the tool's function with a specific verb and resource: 'Generate a random UUID (Universally Unique Identifier) version 4.' This immediately distinguishes it from sibling tools like base64_encode or sha256_hash, which perform different operations.

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?

While no alternatives are explicitly mentioned, the description provides clear context by explaining UUID v4 properties (random, no host/time/MAC info), making it obvious this is for generating unique identifiers, not for encoding or hashing. There are no exclusions, but the use case is unambiguous for a parameterless tool.

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