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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false), and the description adds substantial value beyond that: it discloses the return shape and subtle semantics such as 'no is_lead means no ranking, not "not the lead"' and the role vs role_name distinction for filtering versus display. With no output schema present, this disclosure carries real weight.

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?

Front-loads example queries before explaining output fields, which is the right ordering for an agent deciding whether to call it. There is mild redundancy in 'The design team for a pinball game — designer, artist, programmer, mechanical engineer, sound designer, animator, etc.' after the credit list was already implied, but no sentence is wasted overall.

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?

With no output schema, the description does the heavy lifting by documenting role, role_name, is_lead, url, and game_url and how to use each. Gaps remain minor: it does not state ordering of results or behavior on an unknown/invalid id, but for a one-parameter lookup the definition is nearly complete.

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 100% and the single `id` parameter is already documented as 'Game slug or ID'. The description never elaborates on the id (e.g. how to obtain a slug, or whether the display name is accepted), so it adds nothing beyond the schema, which is the baseline 3 for a fully covered single-parameter tool.

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?

Names a specific verb and resource ('Who designed a pinball machine', 'Get a game's design team') and pins down scope with 'Returns the full credited team, not just the lead designer', which separates it from a general sibling like get_game_details. It also enumerates the credit types returned (designer, artist, programmer, etc.), so an agent knows exactly what data this yields.

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 three example questions ('who designed Medieval Madness?', 'who did the art for Twilight Zone?') give concrete usage triggers, which is stronger than vague context. However, it never names an alternative sibling or states a when-not condition (e.g. use get_game_details for release dates), so guidance stops short of full routing.

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