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

No annotations are provided, so the description carries the transparency burden. It discloses the returned information (summary, media, owning game, platform, date, and URLs) and that media_url is useful for viewing images/playables. However, it does not explicitly state whether the operation is read-only, what happens when the reference is invalid, or any 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 short and front-loaded with the core purpose, followed by output details and practical usage guidance. It contains a little redundancy with the phrase 'returned by this service' twice, but overall each sentence contributes useful information.

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-style tool with two well-described parameters and no output schema, the description conveys the important output concepts: summary, media, owning-game data, and URL usage. It is clear enough for an agent to call it and interpret the result, though it could have disclosed invalid-input 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?

The input schema already covers 100% of parameter meaning, so the baseline is 3. The description adds some contextual value by tying material_reference to follow-up calls and media_url usage, but it does not significantly deepen the schema's parameter definitions.

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 states the tool fetches creative summary, media, and owning-game information for a material reference. It is distinct from sibling tools like search_materials_v2 or get_game_materials by emphasizing the complete material_reference returned by the service, but it does not explicitly name alternatives.

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?

It gives clear context: use this tool as a follow-up with a complete material_reference returned by this service. It does not explicitly state when not to use it or name sibling alternatives, but the legacy detail_url and follow-up framing provide enough usage guidance.

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