APIbase

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

No annotations are provided, so the description carries the full burden. It discloses the data source (MyAnimeList via Jikan) and lists return fields (synopsis, score, etc.), compensating for the lack of output schema. However, it omits error handling (invalid ID behavior), rate limits (relevant for Jikan), or side effects.

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 a single, efficient sentence using an em-dash to cleanly separate the action from the return value enumeration, with a parenthetical source attribution. Every clause earns its place with no redundancy.

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?

Given this is a simple lookup tool with one parameter and no output schema, the description is reasonably complete by enumerating the returned data fields and identifying the external API source. It could be improved by noting error cases for invalid IDs, but adequately covers the essential invocation context.

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?

With 100% schema coverage, the baseline is 3. The description mentions 'MAL ID' which aligns with the schema's 'MyAnimeList ID' description, but adds no additional semantic context about the parameter format or validation beyond what the schema already provides with its examples.

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 a specific verb ('Get') and resource ('anime details'), clearly distinguishes from siblings like 'search' (which finds titles) by specifying 'by MAL ID', and explicitly lists the data fields returned (synopsis, score, rank, etc.) to differentiate from the characters-specific sibling tool.

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 phrase 'by MAL ID' implies this requires a known identifier, suggesting when to use it (when you have the ID) versus the sibling 'search' tool. However, it lacks explicit 'when to use X instead' guidance or prerequisites like needing the ID beforehand.

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