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

The annotations already mark it read-only, idempotent, and non-destructive, and the description adds meaningful context: membership is permanent, unreadable members are reported as ineligible rather than dropped, and comparisons:read is needed. This goes beyond the structured hints and does not contradict them.

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?

Three short sentences, with the core behavior front-loaded and every sentence contributing either behavior, policy, or prerequisites. No filler.

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 one-parameter read-only tool the description covers the core behavior, the permanent-membership policy, the auth scope, and the reason-reporting guarantee. The main omissions are explicit set_id semantics and the exact response shape, so it is not fully complete but sufficient.

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?

With schema description coverage at 0%, the description was responsible for explaining set_id but never mentions it or connects it to the comparison set. The parameter name and uuid format are self-explanatory at a basic level, but no added semantic meaning is provided.

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 first sentence names a specific action ('Report per member whether it can still be compared') and the resource (comparison eligibility), which clearly separates it from retrieval tools like get_comparison_set or execution tools like run_comparison. It is not a tautology or restatement of the name alone.

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 implies the tool is called to check comparison eligibility, but never states when to prefer it over siblings, e.g., before run_comparison, nor gives any when-not conditions. 'Requires comparisons:read' is a permission prerequisite, not usage guidance.

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