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

Annotations already indicate readOnlyHint=false, which aligns with the 'Append' action. The description adds the behavioral detail that it can optionally notify mentioned collaborators, which is not captured by annotations. However, it doesn't disclose other aspects like permission requirements, whether comments are immediately visible, or rate limits.

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?

The description is a single concise sentence that front-loads the core action ('Append a discussion comment') and includes the optional mention behavior. There is no wasted text or 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?

Given the simplicity of the tool, the description, schema (100% coverage), and annotations provide adequate context. It states the primary action and the optional side effect. However, it does not describe the return value or success behavior, and there's no mention of whether the comment requires publication to appear.

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%, with each parameter (handoverId, body, mentionPrincipalIds) having a meaningful description. The tool description itself adds no additional parameter semantics beyond what the schema already provides, so the baseline score of 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?

The description uses a specific verb 'Append' and identifies the resource as 'a discussion comment', which clearly distinguishes it from sibling tools like handover.update_comment (edit) and handover.annotate (annotate). It also mentions the optional notification behavior, making the purpose precise.

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?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention that handover.update_comment should be used for editing existing comments or that handover.thread retrieves the discussion. There are no explicit exclusions or contextual cues beyond the inherent meaning of 'append'.

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