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

No annotations provided, so description carries full disclosure burden. States the operation is a read ('Gets') but omits critical behavioral details: pagination behavior, permission requirements, whether results are cached, what user attributes are returned, or if this includes service accounts/external users.

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?

Single sentence with no redundancy. Main information front-loaded. Appropriate length for a zero-parameter utility function.

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?

Minimum viable for a simple list getter. Adequate given low complexity (0 params, no nested objects), but gaps remain: no output schema referenced, no description of user object fields, and no behavioral constraints documented despite lack of annotations.

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?

Zero parameters per input schema. Per evaluation rules, 0 parameters warrants a baseline score of 4. The description confirms no filtering is possible ('all users'), which aligns with the empty parameter schema.

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?

Clearly identifies the resource (users) and scope (all users belonging to the organization) with a specific verb. Implicitly distinguishes from performance-focused siblings (get_cwv_element_breakdown, get_domain_performance_overview, etc.) by targeting user directory data rather than metrics.

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?

Provides no guidance on when to use this tool versus alternatives, prerequisites such as admin permissions, or whether this retrieves active users only versus deactivated/archived users. No mention of pagination or filtering limitations.

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