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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=true, and openWorldHint=false, so the safety profile is covered by structured data. The description adds the scope of mutable settings, but does not clarify the surprising destructiveHint=true implication — whether unspecified settings are preserved or reset — which is exactly the behavior an agent needs to know before calling.

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 tight sentences with no filler, and the mutation scope is front-loaded ahead of the discovery instruction. Every clause 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 two-parameter, fully-described schema with annotations carrying the safety profile and no output schema, the description covers what changes and how to find valid fields. The remaining gap is the partial-versus-full update semantics implied by destructiveHint=true.

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 coverage is 100% so the two parameters are documented, but the settings object's schema description is generic ("Object with setting fields and their new values"). The description adds real value by pointing to get_activity_schema(include_settings: true) as the authoritative source for valid setting keys, going beyond what the nested schema conveys.

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 verb and resource ("Update game settings of an activity") and gives concrete examples of the affected fields (time limit, attempts, shuffling), which distinguishes it from the broader update_activity sibling. It stops short of explicitly contrasting itself with update_activity, but the scope 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?

It gives an actionable prerequisite: call get_activity_schema(include_settings: true) to discover the editable fields before invoking this tool. That meaningfully routes the agent, though it offers no when-not guidance or explicit alternative for cases where the update should happen elsewhere.

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