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

Annotations already declare readOnly, idempotent, non-destructive and openWorld, so the safety profile is covered. The description adds behavior not in annotations: the required OAuth scope and the fact that the result set can be truncated by plan tier — a real interpretation risk an agent should know about.

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 short sentences with no wasted words; the permission requirement is front-loaded in the second sentence and the plan caveat follows immediately. Nothing repeated from the title or annotations.

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, zero-required-parameter list tool with fully documented schema and no output schema, the description covers purpose, permission, and the plan constraint. It does not mention pagination or result shape, but the schema handles paging and annotations handle safety, so this is close to complete.

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% and the six parameters (embed, field, limit, order, offset, direction) are each documented in the schema, including cursor pagination semantics. The description adds nothing about parameters, which is acceptable at baseline 3 but leaves no added value.

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 ("List the staff members of the account") with a clear scope qualifier about plan-dependent results. No sibling exposes staff data, so differentiation is implicit rather than stated, which keeps it short of a 5.

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 supplies a prerequisite ("Needs staffs.read") and a caveat that the list may only contain yourself depending on plan, which helps an agent interpret empty/limited results. It gives no guidance on when to use this versus other listing/search tools or what to do when results look sparse.

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