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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds the underlying endpoint (GET /entity/{entityId}/users) and the nature of the returned users, but says nothing about pagination, ordering, or result size for a list operation.

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; the purpose is front-loaded and the endpoint reference is secondary. Nothing is wasted, though the endpoint restatement adds little for an agent that already knows the resource.

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 single-parameter, read-only list tool with annotations covering safety and no output schema to explain, the description is nearly sufficient. The one real gap is pagination/return-size behavior, which an agent calling a list endpoint would benefit from knowing.

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 entityId parameter is documented as accepting an entity ID or foreign ID. The description only echoes the path variable, adding no syntax or format detail beyond the schema, so the baseline of 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?

States a specific verb (List) and resource (users belonging to an entity), plus a parenthetical clarifying who these users are (approvers, admins). It is easy to distinguish from get_entity or list_entity_payment_methods, though it never names a sibling explicitly to sharpen the boundary.

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 phrase 'belonging to an entity' implies the context of use and the role hints suggest it's a roster lookup, but there is no explicit when-to-use guidance or comparison against alternatives like get_entity, which may also surface user information.

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