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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, openWorldHint=false, so the safety profile is covered. The description adds meaningful behavioral context by disclosing what the call actually returns (including a 'review-mined summary' and links), which matters because there is no output schema. It does not cover failure modes for an unknown game, but it goes beyond the annotations.

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?

A single sentence, front-loaded with the resource and scope before the field list. It is efficient, though the long comma-separated enumeration of fields is dense rather than structured (e.g., no grouping of identity vs. review data).

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 only two simple, fully documented parameters and no output schema, the description carries the return-value burden and does so by enumerating the fact categories. Minor gaps remain: nothing about behavior for an unrecognized game or how `lang` affects non-`why` fields.

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%: the schema already documents that 'game' accepts names, typos, Russian names, appids or store URLs, and that 'lang' controls the language of the `why` lines. The description adds no parameter-level detail beyond that, 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 names a specific resource and scope ('Public facts about one Steam game') and enumerates the exact payload (year, developers, genres, tags, price, Deck status, reviews, summary, links). That is enough to separate it from siblings like find_game_by_description (search by text) and games_like (similarity lookup). It lacks an explicit retrieval verb, but the intent is unambiguous.

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?

Usage is only implied: an agent can infer 'call this when you already know which game you want facts for.' There is no explicit when-to-use statement and no mention of the sibling tools or when they would be preferable (e.g., when the game name is unknown, use find_game_by_description).

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