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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the 'without posting or changing' phrasing mostly reinforces rather than extends them. The description adds the 'policy-aware' behavioral context, but it does not go into output format, authorization mechanics, or what happens if the review is not found. With annotations covering safety, this is adequate but not rich.

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 a single sentence that front-loads the core action and then states the key constraint. Every part earns its place and there is no filler or redundancy.

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 simple two-parameter, read-only tool with full schema coverage and safety annotations, so the description is largely sufficient. The main gaps are that it does not describe the returned draft format or explicitly point to search-reviews as the source of review_id, but these are minor given the low complexity.

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 both review_id and tone are already documented in the schema. The description adds little beyond tying the operation to 'one authorized review', so it does not need to compensate for missing schema detail. Baseline 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 uses a specific verb ('Drafts'), a specific resource ('a policy-aware reply for one authorized review'), and explicitly clarifies the non-action ('without posting or changing the review'). This makes the tool clearly distinct from sibling preview and search tools by focusing on drafting a review reply.

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 gives clear usage context: it is for drafting a reply to one authorized review, and it is not for posting or modifying the review. It does not explicitly name a sibling alternative or say 'use search-reviews to get review_id', but the boundary of when to use it is clear.

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