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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and a closed world, so the safety profile is fully covered. The description adds only the 'most recently added' ordering signal and the media-type scope, with no detail on how 'recent' is defined or how ordering/paging behaves. Modest added value on top of the annotations.

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?

One compact sentence with no filler, front-loading the verb, resource, and recency constraint. Nothing to trim.

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?

The tool is simple, has a documented parameter, complete annotations, and an output schema, so return format need not be explained. Remaining gaps are minor: how 'recent' is defined and whether results are truncated without paging, neither of which is likely to cause a wrong call.

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 100% and the single limit parameter already documents default 10 and max 50. The description adds nothing about limit or the result ordering it controls, so the schema does the heavy lifting and the baseline 3 applies.

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 a specific verb (List), resource (media), and scope (most recently added), with concrete content examples (books, articles, podcasts). It implicitly separates itself from get_media (single item) and search_media (query-based) through the 'recently added' framing, but never names a sibling explicitly, so it stops short of a 5.

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?

No when-to-use guidance and no alternatives named. An agent must infer that list_recent_media is the right pick over search_media when no query is available, and nothing states exclusions or prerequisites. Only the resource name implies usage.

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