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

Annotations already declare destructiveHint=true, idempotentHint=false, and readOnlyHint=false, so the safety profile is covered elsewhere. The description adds nothing beyond that: it doesn't say what gets overwritten, whether omitted fields are preserved (all four params are required), or whether the change is reversible.

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, fully front-loaded with no filler. Brevity is not the problem here; the sentence is simply too thin to earn its place as guidance.

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 destructive, non-idempotent mutation with four required parameters and no output schema. For that complexity level, the definition should at minimum explain what a hidden option does at the quiz level and what the update affects, none of which is present.

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%, with each parameter documented (including that opt_id comes from quiz://{id}/hidden_options), so the description can rely on the schema. It adds no interpretation of 'name'/'value' semantics (e.g., whether value is a JSON blob, a flag, or free text), which is the baseline expectation when the schema is complete.

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 restates the name and title almost verbatim ('Updates a hidden service option on the quiz') without saying what a 'hidden option' actually is or how this differs from create_hidden_option, delete_hidden_option, update_widget_hidden_option, or get_quiz_hidden_options.

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 indication of when to use this tool versus creating a new option or updating a widget-level option, and no mention of prerequisites. An agent must infer everything from the name.

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