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

Annotations already declare readOnlyHint=true, so safety is covered, but the description adds a genuine behavioral trait: results are permission-scoped ("that you can see (admins see all)"). That visibility caveat is not derivable from the annotations or the empty schema and materially affects interpretation of the result set.

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?

A single front-loaded sentence that carries the action, the permission scope, the returned identifier and the use case, ending with the API mapping ("LACRM: GetUsers."). No filler or redundancy.

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 zero-parameter read tool with no output schema, the description covers what it does, who sees what, and what it returns at the identifier level. It could go slightly further on the shape of the returned user records, but nothing required to invoke it correctly is missing.

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?

The tool takes zero parameters, so the baseline is 4; there is no parameter syntax the description needs to compensate for. The mention of UserIds describes output content rather than an input, so no additional credit 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 and resource ("List the users on the account") plus a scope qualifier ("that you can see (admins see all)") and names the returned identifier (UserIds). It is clearly distinguishable in substance from the single-record sibling lacrm_get_user, though it never names that sibling explicitly.

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?

Gives concrete downstream context for calling it — "needed to assign contacts, tasks or filter by owner" — which tells the agent the scenario in which the UserIds are required. It stops short of stating exclusions or naming the alternative (lacrm_get_user) for single-user lookups.

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