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

Annotations already flag destructiveHint=true, idempotentHint=false and openWorldHint=true, so the bar is lower. The description adds a genuinely important behavioral trait not present in structured fields: the operation waits for the owner's approval before going live, so it is asynchronous/pending rather than immediate.

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 short sentences, front-loaded with the action and followed by the key operational constraint. No filler.

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 two-parameter mutation with rich annotations and full schema coverage, the description covers the main surprises: public visibility and the approval wait. It could say what happens to an existing reply (replaced?) or what state the tool returns while pending, but nothing essential is missing.

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% for both parameters, so the baseline is 3. The phrase "public reply" reinforces that the text becomes publicly visible, but it adds little beyond what the schema already says for reply and review_id.

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 and resource: posting or changing a public reply to a client's review. It is easy to distinguish from list_reviews, though the sibling is not named explicitly.

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?

"Post or change" implies an upsert (use this whether or not a reply exists), which is useful implied guidance. However, there is no explicit when-to-use versus alternatives, no prerequisites, and no mention of how to find a review_id beyond the schema's own note.

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