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

Annotations already declare readOnlyHint=false and idempotentHint=true, so the 'WRITE:' prefix and the idempotency note largely restate structured data. The POST endpoint path is a small addition, but nothing is said about permissions, the effect on the suggestion's existing labels, 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?

A single tight sentence, front-loaded with 'WRITE:' so the mutation nature is visible immediately. No filler, though it is minimal to the point of leaving gaps.

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 simple two-parameter write with annotations already covering the safety/idempotency profile and full schema descriptions, the definition is adequately complete. Only permission requirements and the exact effect on suggestion state are missing, which are minor here.

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%, so both parameters (label_id, suggestion_id) are already documented, including the pointer to uservoice_list_labels. The description adds no format or constraint detail beyond the schema, so baseline 3 applies.

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+resource: 'attach a label to a suggestion,' which clearly separates it from siblings like add_comment or add_feedback. It does not explicitly name a sibling it should be preferred over, but the action is unambiguous.

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 clause 'attaching it again changes nothing' gives a reuse condition, implying safe repeat calls, but there is no explicit when-to-use vs when-not, no prerequisites, and no named alternative (e.g., detach or list). Usage is only implied.

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