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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so safety is covered. The description adds value by naming the endpoint (GET /users) and, with no output schema present, listing the fields that come back — information the agent would otherwise not have. It stops short of describing pagination behavior or whether results are scoped to a site.

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?

Three short sentences with zero filler: purpose and returned fields first, then usage, then the endpoint. Nothing repeats the annotations or schema.

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 two-optional-parameter read tool, the description covers purpose, return fields (important since no output schema exists), and downstream use. The only gap is scope — whether the list is all users in the account or limited to a site/workspace — which would affect interpretation of the results.

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%: page and per_page are fully documented, including the "pass the previous reply's next_page" chaining hint. The description mentions neither parameter, which is acceptable at full coverage but adds nothing beyond the schema baseline.

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 CATS users (recruiters)") and enumerates the fields returned: id, name, title, access level. No sibling tool in the list targets users, so there is no ambiguity to resolve, and the parenthetical clarifies what a "user" means in this domain.

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?

"Use the ids as owner or assignee" gives concrete downstream context that tells the agent why and when to call this tool. It does not spell out exclusions or contrast with alternatives, but no competing tool exists for this resource, so the guidance is adequate.

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