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 operation; the description adds useful behavioral context by specifying the Japan broadcast-date ordering, safe-for-work filtering, and that results are limited to episode numbers and dates. It does not discuss authentication, rate limits, or pagination, so it is strong but not exhaustive.

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?

Three short sentences, front-loaded with the core action and scope, with no filler. The constraints are stated compactly and are easy to scan.

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 simple, optional-parameter read tool with no output schema, the description gives enough scope, source, ordering, and result-content context to call it correctly. Minor gaps remain around return shape details beyond episode numbers and dates, but nothing critical is missing.

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?

The schema has 100% description coverage for the single `days` parameter, including its default, min/max, and meaning. The description reinforces the 'next few days' window but does not add format or edge-case detail beyond the schema, so baseline 3 is appropriate.

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: lists anime episodes airing over a bounded upcoming window, ordered by Japan broadcast date and sourced from MyAnimeTracker. That scope is clearly distinct from search_anime, get_filler_guide, and get_watch_order without needing to name them.

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 implies the tool's use case through the upcoming-airings scope, but it does not explicitly say when to choose it over search_anime or the other siblings. The safe-for-work and episode-number/date constraints are output filters rather than usage guidance.

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