Update giveaway

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

Annotations already declare readOnlyHint=false, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered structurally. The description contributes nothing beyond that — it does not say whether the update is a merge or replace of the giveaway object, what happens to unspecified fields, or what authorization is required.

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 short sentence with no filler and the verb front-loaded. It is efficient, though the terseness borders on under-specification rather than true conciseness.

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?

This is a mutation of a nested, undocumented object ('StreamElements does not document them field by field') with no output schema and no annotation-level detail about mutation semantics. The description does not say whether the payload is partial or full, which is the single most important thing an agent needs to call it safely.

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 the schema already documents channel, giveawayId format, and the loosely-specified giveaway object. The description adds no semantic detail beyond the schema, which is the baseline-3 case.

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?

States a verb ('Update') and a resource ('a giveaway's settings'), so the basic operation is identifiable. However, 'settings' is left entirely unspecified, and among siblings like giveaways_complete, giveaways_reopen, giveaways_close, giveaways_start and giveaways_delete, the description offers no clue which fields this mutates or how it differs from those state-transition tools.

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?

There is no statement of when to use this tool versus giveaways_complete, giveaways_close, giveaways_reopen, or giveaways_create_by_id, and no prerequisites such as needing an existing giveaway id. The agent must infer the use case entirely from the name.

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