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

Annotations already declare readOnly, idempotent, and closed-world, so the safety profile is covered. The description adds genuinely useful behavior beyond that: outputs come from cryptographic randomness, batch size is capped at 10,000, and inspection reveals version/variant/v7 timestamp.

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 dense sentence that front-loads the primary generate action before the secondary inspect mode. Every clause carries information, though the stacked 'or' clauses make it slightly packed.

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?

With an output schema present, return values needn't be described, and annotations carry the safety profile. The description covers both modes, versions, and the batch cap, leaving only the value-parameter format unaddressed.

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 coverage is only 25% (only 'value' is documented), so the description must compensate. It partially does: 'up to 10,000 at once' maps to count, 'version 4 or version 7' maps to version, and 'inspect' maps to the action enum. It still says nothing about the required format of the value parameter, leaving a gap.

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 specific verbs (generate, inspect) and the resource (UUID), plus version specifics (v4/v7) and the inspection targets (version, variant, v7 timestamp). It clearly separates this from sibling generators like generate_password or generate_totp by resource, though it never names an alternative explicitly.

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 distinguishes the two modes ('generate ... or inspect the version, variant, and v7 timestamp'), which implies when each applies, but gives no explicit when-to-use or when-not guidance and never routes the agent away from siblings.

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