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

Annotations already establish that this is a read-only, idempotent, non-destructive, closed-world lookup. The description adds meaningful behavioral context beyond that: it discloses the limited reviewed catalog, that it reports when a series is not covered, and that output is episode numbers only with no plot details.

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 front-loaded with the core purpose and then adds compact clarifications about novel adaptations, coverage limits, and output scope. It is dense but each sentence contributes useful context, though the novel-adaptation definition is slightly wordy relative to the rest.

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 read-only, no-output-schema tool with two fully documented parameters, the description covers what the tool returns, what it excludes, how coverage limits are handled, and how to provide the series identifier. An agent has enough information to call it correctly without needing more.

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%, so the schema already fully documents both the title and mal_id parameters, including the preference for catalog ID when available. The description only restates 'Give a title or a catalog ID' and does not add format, fallback, or precedence details beyond 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 uses specific verbs and resources: it lists filler/recap episodes to skip, mixed episodes to keep, and separate novel adaptations. This clearly tells an agent what the tool returns. It does not explicitly name sibling tools like get_watch_order or search_anime, so the differentiation is implied rather than stated.

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 gives clear usage context: it is for identifying episodes to skip versus keep, clarifies what counts as a novel adaptation, and notes that coverage is limited to a small reviewed set of series. It stops short of naming alternative tools or explicit when-not-to-use conditions, but the intended use case is easy to infer.

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