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

Annotations already flag destructiveHint=true and openWorldHint=true, and the description explains the behavior behind that destructiveness: on Google Business Profile a review has only one business reply, so replying again replaces it. It also adds real constraints the annotations cannot express (YouTube replies attach to the top-level comment, 4,096-byte limit, verified locations only, Google moderation leaves status pending). It is dense with behavioral context, though it does not say what a successful call returns.

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?

Front-loaded with purpose, then platform-specific caveats in compact parentheticals; almost every clause carries a constraint an agent needs. The Google Business Profile parenthesis is long and stacks several rules, which mildly taxes readability, but nothing is wasted.

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?

Covers platform quirks, ID sourcing, size limits, moderation, and the replacement behavior for a mutation tool with no output schema and adequate annotations, so an agent can call it correctly. The only gap is that it never indicates what the call returns (e.g., the new reply id or the pending status value), which would help confirm success.

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 80%, so the baseline is 3, and the description clears that bar by adding semantics the schema lacks: commentId doubles as the review id on googlebusiness, and the message is capped at 4,096 bytes on that platform. The platform enum is also spelled out. Only the optional workspace parameter is untouched, which is acceptable.

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?

States a specific verb and resource (reply to a comment) plus its extension (answer a Google review), and enumerates the exact platforms supported. An agent can distinguish it from hide_comment, delete_comment, and send_message without consulting either schema.

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?

Explicitly tells the agent where to obtain commentId, accountId and platform ('from list_recent_comments or get_post_comments'), which removes the main routing ambiguity. It does not, however, state when to prefer this over send_message for a reply-like DM, so there is no explicit exclusion.

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