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

Annotations already declare readOnly/idempotent/non-destructive. The description adds real value beyond them: the returned value is a signing payload bound to a timestamp, and the signing scheme is EIP-191 personal_sign. It does not describe the response shape (field names, whether a nonce/expiry is included), which matters since there is no output 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?

Two sentences, no filler, with the purpose and the required follow-up action front-loaded. Every clause carries information the agent needs to sequence the call.

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 read-only preparation step with no output schema, the description covers the workflow and the nature of the return value (signable text + embedded timestamp). Minor gap: it does not state the response's structure or whether the message expires, which an agent passing the result forward might want.

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%, so all four parameters including replyTo and format constraints are already documented. The description only implies that body/author/token feed the message construction and adds no format or constraint detail beyond the schema; 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?

States a specific verb and resource — returns the exact text the author wallet must sign for a token comment — plus the signing standard (EIP-191 personal_sign) and the embedded timestamp. It is clearly distinguishable from the sibling post_token_comment, which is the write half of the flow.

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 frames itself as 'Step 1 of posting a comment' and tells the agent the next action: 'Then call post_token_comment with the signature.' The alternative/sequel is named with its trigger, so the ordering is unambiguous.

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