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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description still adds real behavioral context: results are limited to safe-for-work titles and sorted most-recently-updated first, plus a preview of the returned fields. It omits anything about authentication requirements or the behavior when the list is empty.

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?

Two dense sentences with no filler: the scope and returned fields come first, then the filtering and ordering constraints. Every clause carries information an agent can act on.

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 no output schema, the description correctly compensates by naming the returned fields, and it discloses the safe-for-work filter and sort order. What remains unsaid is minor for a two-optional-parameter read tool — notably whether results are paginated or what an empty list looks like.

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 100% with both parameters fully documented, including the enum values and the 1-50 range, so the baseline is 3. The description restates the status vocabulary and the recency ordering, which is consistent with the schema but adds no new syntax or edge-case meaning.

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 and resource ("List the signed-in person's MyAnimeTracker list") and enumerates the fields returned (status, score, favorite, episodes watched), which makes the tool's scope concrete. It does not name or contrast itself with siblings like search_anime, so an agent must infer the catalog-vs-personal-list distinction.

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 statement of when to use this tool versus search_anime or whats_airing, and no prerequisites or exclusions beyond the implicit "signed-in person's" scope. The status filter is described as data behavior in the schema, not as guidance on when to apply it.

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