mdl_custom_lists_popular

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds no behavioral context beyond those annotations, such as pagination behavior, ordering criteria, or what 'popular' means in practice.

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 extremely short, but it is under-specified rather than concise: every sentence should earn its place, and this one carries almost no retrievable information. It is front-loaded only in the sense that the identifier appears immediately, not in terms of useful content.

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 paginated list endpoint with no output schema, the description says nothing useful about return shape, ordering, or when 'popular' applies. It does not help the agent invoke the tool correctly beyond identifying the resource name, leaving the definition essentially incomplete.

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 description coverage is 0%, and the description does not mention the page or limit parameters at all. With no compensation from the description, the agent gets no semantic guidance on how to control pagination or result size beyond the raw type/default/min/max in the schema.

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 'Custom Lists: popular.' is a tautological restatement of the tool name, adding no verb or scope beyond what the name already conveys. It also fails to distinguish this tool from close siblings like mdl_custom_lists_trending or mdl_custom_lists_featured, so an agent cannot reliably tell which list variant it returns.

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 no guidance on when to use this tool versus alternatives such as trending, featured, or recent activity lists. The description provides no context, prerequisites, or exclusions to help an agent choose correctly among the many custom-list siblings.

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