add_users_groups_to_role

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

The description labels it as a WRITE OPERATION but does not disclose other behavioral traits like required permissions, idempotency, or what happens if the role does not exist or if users/groups are already assigned. With no annotations, the description carries the full burden and falls short.

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?

The description is extremely concise at one sentence plus a flag. It is front-loaded with the main action. However, it could include more detail without becoming verbose.

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?

Given the tool has an output schema (not visible), return values are not described. No error cases or edge conditions are mentioned. For a write operation, more context (e.g., confirmation of success) is needed.

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 0%, so the description must explain parameters. It does not. The role_id is required, but users and groups are strings with null default—no explanation of format (e.g., comma-separated IDs or names). This leaves ambiguity for the agent.

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?

The description states 'Add users and/or groups to an existing role,' which clearly identifies the action and resource. It also marks it as a WRITE OPERATION, distinguishing it from sibling tools that create, delete, or read roles, users, groups, and policies.

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?

No guidelines are provided about when to use this tool versus alternatives, such as create_ranger_role or update_ranger_role. There is no mention of prerequisites (e.g., role must already exist) or when not to use it.

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