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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description still adds useful behavior beyond that: it reports what comes back ('matching PadConsole games with links') and explicitly rules out side effects ('Does not start a game'), which an agent needs before suggest-then-launch flows.

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 trigger condition is front-loaded in the first clause, and the negative constraint closes the description. The long example list ('zombies, pirates, music...') is verbose on the page but genuinely helps keyword matching, so only minor trimming is warranted.

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 an output schema present, the description needn't explain return structure, yet it still summarizes results as games with links, and it clarifies the no-side-effect boundary. Nothing critical is missing for a read-only search tool; only the sibling boundary against recommend_games is left unstated.

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%, so every parameter (query, locale, players, max_results) is already documented, and the enum for locale is fully specified. The description adds only illustrative theme vocabulary, not syntax or constraint detail, so the baseline of 3 applies.

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 states a concrete verb and resource ('search ... games') and scopes it to theme/keyword discovery, with a rich list of example themes ('football, racing, fighting, horror, quiz...'). It distinguishes itself from group-size filtering, but never differentiates itself from the closest sibling, recommend_games, which likely overlaps heavily.

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 an explicit trigger ('when someone asks for a kind of game by theme or keyword') and an explicit non-trigger ('rather than by group size'), which is strong routing guidance. It stops short of naming alternative tools such as recommend_games or get_game_details, so an agent must infer the boundary itself.

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