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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false, openWorldHint=false). Beyond that, the description adds substantive behavioral context: it enumerates the returned quiz payload and even notes a workflow shortcut (no separate quiz://{id}/structure read needed). It omits auth/permission requirements, but with annotations covering safety this is a genuinely additive description.

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, purpose front-loaded, followed by the return-shape detail. The field list is long but justified because no output schema exists; minimal waste overall.

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 mutation tool with no output schema, the description helpfully compensates by documenting the response payload and the workflow benefit. It stops short of describing reversibility or permission requirements, but with annotations present it is complete enough to call correctly.

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% and both required params (quiz_id, theme_id) are documented in the schema itself. The description adds no format or constraint 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?

States a specific verb+resource: applies a given design theme to a quiz ('Применяет указанную тему оформления к опросу'), which is clearly distinct from create_theme/update_theme/manage_theme in the sibling list. An agent can identify the operation without opening the schema.

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 implies the use case (attaching an existing theme to a quiz) but gives no explicit when-to-use/when-not guidance, no prerequisites, and no named alternatives such as update_theme. Usage is only inferable.

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