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

Annotations already supply idempotentHint=true, destructiveHint=false, and readOnlyHint=false. The description adds no behavioral context beyond the schema's boolean semantics, such as whether the existing flag is overwritten or whether any related state changes. It does not contradict the annotations, but it also does not enrich them.

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?

The description is short and readable, but the first line simply repeats the tool title and earns no additional value. The second sentence is compact and meaningful, keeping overall length appropriate, though the redundancy prevents a higher score.

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 two-parameter update tool with an output schema, the core action is adequately described. However, missing usage routing among sibling tools and any note about overwriting the existing flag value leave some contextual gaps. It is sufficient for straightforward invocation but not fully complete.

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 both 'id' and 'is_duplicate' already clearly documented. The description's word 'whether' adds minimal meaning over the boolean parameter description, so the baseline of 3 is appropriate.

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 states a specific verb ('Mark') with a clear resource and property ('whether a review is a duplicate record'). This distinguishes it from sibling tools like updateReviewVisibility or updateReviewTags, which target different review attributes. It goes beyond the title by explaining the flag's meaning.

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 guidance on when to use this tool versus alternatives. With many updateReview* siblings, the agent is not told that this tool is specifically for toggling duplicate status or when it should be preferred. Usage is only implied by the tool's name and a generic restatement.

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