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

No annotations are provided, so the description must carry the full behavioral burden. It states that content comes from official YouTube channels and is the latest, but omits return format, pagination behavior, ordering, authentication needs, and how the limit parameter behaves.

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, front-loaded sentence that states the resource first, then sources and filters. It is dense but not wasteful, though the long company list could be considered slightly verbose.

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 read/list tool with no output schema and no annotations, the description should ideally say what is returned and how the limit parameter works. It covers content and filtering adequately but leaves gaps around output format and optional parameter behavior.

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 67%, with enum descriptions already present for group and device. The description adds some value by listing Japanese companies for the 'jp' group and restating device filters, but it does not explain the 'limit' parameter or fully clarify all group values such as 'west'.

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 clearly identifies the resource: latest game trailers and PVs from official YouTube channels, with a list of sources and filterable device types. It does not mention any sibling tools or distinguish itself from release_calendar or game_hype_ranking, but the purpose is specific enough for an agent to understand what the tool returns.

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 provides no explicit when-to-use guidance or alternatives. Usage is only implied by the content (latest trailers/PVs), and there is no indication of when to choose this over other game-related tools.

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