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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds useful behavioral context by listing what metadata is included and prescribing the version-quoting convention, but it does not go further into output shape or any other operational behavior. This is adequate given 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?

Two sentences with no wasted words: the first fronts the metadata contents, and the second adds a practical usage rule. Every sentence earns its place.

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 zero-parameter metadata tool with no output schema, the description is nearly complete: it names the key fields available and tells the agent how to use the game version responsibly. It could mention response format, but the enumerated contents make the tool's purpose and value clear.

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 tool takes zero parameters, so there is no parameter burden for the description to carry. The schema has complete coverage by having no properties. The description's content list is the only semantic information needed.

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 identifies the tool as providing catalog metadata and enumerates the specific contents (game version, schema version, counts, locales). It is clear about the resource and scope, though it uses a noun phrase ('Catalog metadata') rather than a strong action verb. It is distinguishable from the sibling list tools because it emphasizes aggregate metadata and counts.

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 gives a concrete usage directive: quote the game version alongside simulation results to keep evidence tied to the data. This tells the agent when catalog_info is relevant. It does not explicitly name alternatives or state when not to use it, but the context is clear enough for a zero-parameter metadata tool.

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