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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false and openWorldHint=false, so the safety profile is covered structurally. The description adds nothing further — no statement about permissions, whether the old name is recoverable, or what a rename affects in live quizzes; and it largely repeats what the schema already says about the hidden variable.

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 front-loaded sentence with no filler. It is efficient, though at this length it veers toward under-specification rather than true brevity.

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 single-attribute rename with a fully documented three-parameter schema and no output schema, the essentials are present. What is missing is any routing guidance among the many sibling variable/option tools and any note on effects or constraints, leaving it merely adequate.

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%: quiz_id, field_id (including where to obtain the UUID) and name are all documented in the schema. The description contributes no additional parameter semantics, so the baseline 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 and resource ('Обновляет имя скрытой переменной опроса'), and narrows scope to a single attribute (name) of a hidden variable. It does not, however, distinguish itself from adjacent siblings such as create_quiz_variable, delete_quiz_variable or update_hidden_option, so the agent must rely on the name alone.

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?

No when-to-use guidance, no prerequisites, and no mention of the alternative tools for the same resource. The schema hint about pulling field_id from quiz://{id}/variables is the only procedural cue, and it lives in the schema rather than the description.

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