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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safe-read profile is covered structurally. The description adds the response envelope (total, has_next_page) and clarifies that 'role' is a production role, which is useful context; but with an output schema present, the enumerated fields are largely redundant and no behavioral caveats (rate limits, pagination limits) are disclosed.

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 compact sentences, purpose front-loaded ahead of the response shape, with no filler. The only mild inefficiency is listing output fields that the output schema already carries.

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 annotations covering safety, a complete 100%-covered input schema, and an output schema present, the description is nearly sufficient for correct invocation. The remaining gap is sibling disambiguation — nothing tells the agent why to pick this over manga_title_staff.

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 schema already documents id format (numeric AniList id), the 1-based page default, and the per_page default/clamp behavior. The description adds nothing about the parameters, so 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 and resource: 'Returns the people credited on an anime.' An agent immediately knows this yields staff/credit data for a given anime. It does not, however, differentiate itself from the near-identical sibling manga_title_staff or from anime_title_characters, leaving that disambiguation to the caller.

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, prerequisites, or alternatives are stated. The description never mentions that an anime id must first be obtained (e.g. via anime_search) nor how to choose between this and manga_title_staff or anime_title_characters. Usage is only inferable from the tool name.

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