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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds the cross-reference that the returned id feeds task owner_user_id/user_ids and cites the underlying GET path, but says nothing about pagination, result caps, or required project permissions.

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 no filler; the returned-fields list and the filter capability come before the endpoint path. Slightly abrupt/fragmented phrasing ('Users on one project with...') but every sentence carries information an agent can act on.

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?

With no output schema, the description helpfully enumerates the returned user fields and the id's downstream meaning, which is the main thing an agent needs. Missing pagination/ordering behavior keeps it short of complete for a 5-parameter listing tool.

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 only 40% — company_contains, last_name_contains and first_name_contains carry no schema description. The description partially compensates by saying it filters by email, name and company, which maps those parameters to the 'contains' semantics, but it adds no format, matching-case, or combination behavior.

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 clear resource and scope — 'Users on one project' — plus the fields returned (name, company, job title, email, phone), so an agent knows exactly what it gets. It implicitly separates itself from fieldwire_list_account_users via 'one project', but never names that sibling as the account-wide alternative.

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?

Offers filtering guidance ('Filter by email, name or company') and a useful cross-tool note that the returned integer id is what tasks expect for owner_user_id/user_ids. There is no explicit when-to-use/when-not statement or routing to the account-level or team-level listing tools.

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