🟢 List RHEL distributions (latest minor per major). No Fedora/CentOS Stream support.

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and reach are covered. The description adds the aggregation rule (latest minor per major) and a negative scope constraint, which is genuine extra context, but says nothing about auth requirements or result volume/pagination.

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 front-loaded sentence with the key scope constraint in parentheses and the exclusion tacked on cleanly; nothing is padded. It is essentially a restatement of the title, which slightly limits the value of the description text itself.

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-value detail is unnecessary, and a zero-parameter list tool needs little more than what is stated. The description is complete enough for correct invocation, though a note on how results relate to image building would fully close the loop.

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; baseline 4 applies. Schema coverage is 100% and additionalProperties is false, so no parameter gap exists.

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?

Tautological: description restates name/title.

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?

There is an implicit when-not signal ('No Fedora/CentOS Stream support'), which tells the agent this is RHEL-only, but no positive when-to-use guidance or named alternatives. Adequate but leaves the agent to infer the context of use.

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