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

The readOnlyHint annotation already covers the safety profile, yet the description adds real domain behavior: labels are scoped to one beta project, they appear on testers and tasks, and they gate task visibility so completion percentages are per-tester. That visibility-gating rule is context an agent cannot get from annotations or schema, though return shape details (beyond categoryId) are absent.

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 core action is front-loaded in the first clause and each following sentence carries routing or domain information. The label-gating explanation is slightly tangential for a list call but earns its place by explaining why per-tester completion exists.

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 one-parameter read tool with no output schema, the description covers scope, the notable returned field (categoryId), the relationship to testers/tasks, and the correct sibling for creation. Only the full return structure and whether categories are always populated are left implicit.

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% and the single parameter already documents itself (productId, sourced from listProducts). The phrase "of this beta project" merely restates the schema's meaning and adds no format, constraint, or edge-case guidance beyond it, so the 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?

"List the labels of this beta project with their categoryId" gives a specific verb, resource, scope, and even the key returned field. It explicitly separates itself from ticket tags (listTicketTags) and names the creation sibling (createBetaLabels), so an agent can distinguish it from the surrounding list* tools without opening any 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?

The description tells the agent when to use a different tool: tickets use workspace tags via listTicketTags instead, and new labels are made with createBetaLabels. It does not mention updateBetaLabel/deleteBetaLabel as follow-ups for mutation, but the primary confusion risk (label vs. tag) is resolved.

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