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

Annotations already flag a destructive, non-idempotent, open-world write, so the bar is lower, and the description still adds real behavior: the text becomes publicly visible, the review is marked Manually Responded, and there is an owner-approval step. The final sentence 'Waits for the owner's approval' is useful but ambiguous about whether the call blocks, queues, or returns pending status.

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?

Five short sentences, front-loaded with the action and visibility, then eligibility constraints, then effects. Nothing is wasted, though the closing approval sentence is vague enough that it costs a little clarity.

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 3-parameter public mutation with no output schema, the description covers eligibility, side effects, and visibility, which is what an agent needs to decide and call. It stops short of describing what the call returns or how to confirm the reply was published versus left pending approval.

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 coverage is 100% and every parameter is already documented with type, bounds, and provenance (review_id from list_reviews, location_id from list_locations), so the description need not repeat them. It adds only the implicit constraint that review_id must resolve to a review among the location's latest 1000, which is marginal value over the schema.

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 opens with a specific verb and resource ('Post a public reply to a review on Google or Facebook') and names the platform layer (BrightLocal), which immediately separates it from read-only siblings like list_reviews or get_review_summary.

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?

It states explicit preconditions for use: the review must have can_reply true from list_reviews, the location needs a connected Google Business Profile or Facebook page, and the review must fall within the latest 1000. That is a concrete when-to-use gate plus a pointer to the sibling that supplies review_id.

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