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

Annotations cover the safety profile (not read-only, non-destructive, closed-world), and the description adds genuinely new behavior: the comment is public, published under CC0, and must contain no personal data. These visibility and licensing facts are not in the annotations or schema.

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?

Three tight sentences, front-loaded with the action and constraint. The character range duplicates the schema, a small but real 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?

For a non-destructive write tool with no output schema, the definition covers visibility, licensing, privacy expectations, length, and the optional reaction. Minor gaps remain around whether comments are moderated or appear immediately.

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 50%, and the description restates the 2-500 character range already encoded as minLength/maxLength and notes the reaction is optional, which the schema already says. It contributes nothing new about piece_id or visitor_name, so it does not fully compensate for the coverage gap.

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 ("Leave a public comment ... on a piece") and includes the size constraint. It does not, however, differentiate itself from close siblings like leave_note or sign_guestbook, only likening its rules to the guestbook.

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?

"Say what you noticed, felt or learned" gives content guidance and "same rules as the guestbook" implies context, but there is no explicit statement of when to pick this over leave_note, sign_guestbook, or answer_challenge.

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