add_user_to_group

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

No annotations are provided, so the description carries full burden for behavioral context. It only states the operation and parameter list, omitting side effects, permission requirements, or behavior when inputs are invalid (e.g., user already in group).

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 brief and well-structured with an Args/Returns section. It contains no extraneous information, though it could be more informative without sacrificing conciseness.

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 tool with 3 parameters and no output schema details beyond 'Status message', the description is incomplete. It lacks information on error handling, idempotency, or what the status message indicates, which is crucial for an agent to use it reliably.

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 description adds limited meaning: it clarifies that 'realm' is optional and uses a default if not specified. However, it does not explain the format or origin of 'user_id' or 'group_id', and the schema itself lacks property descriptions (0% coverage).

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 clearly states 'Add a user to a group', which is a specific verb-resource combination. It distinguishes itself from siblings like 'remove_user_from_group' and 'create_group' by the action and target.

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 description provides no guidance on when to use this tool versus alternatives, nor does it mention prerequisites (e.g., user or group must exist) or potential errors (e.g., duplicate membership).

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