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

Annotations only supply destructiveHint=true, so the description carries most of the burden. It does disclose a non-obvious side effect: supplying the name/email trio creates a new contact as part of the call. It does not describe what is returned (no ticket ID), notification behaviour, or defaults applied to unset fields. The destructiveHint=true annotation sits oddly next to a pure create operation, but the description does not directly contradict it.

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 sentences, zero padding, and the primary action is front-loaded before the contact-selection rule. The trailing endpoint reference is short and adds traceability rather than bloat.

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 13-parameter mutation tool with no output schema the description covers the main decision point (existing vs new contact), which is the highest-risk ambiguity. It stops short of stating defaults for type/priority/status or the shape of the response, but nothing critical to invoking the tool 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?

Schema coverage is 77%, so baseline is 3, and the description adds a genuine cross-field constraint that the JSON schema cannot express: end_user_id XOR (end_user_first_name + end_user_last_name + end_user_email). That mutually exclusive branching is exactly the kind of semantics an agent needs before filling the 13 parameters.

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?

"Open a new helpdesk ticket" names a specific verb and resource, and the endpoint reference (POST /api/v3/tickets) confirms the operation. It is clearly distinguishable from atera_get_ticket, atera_update_ticket and atera_add_ticket_comment, though the description never names those siblings 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?

The description gives a real conditional rule for the contact branch (use end_user_id for an existing contact, or the three name/email fields to create a new one). However, it offers no guidance on when to use this tool versus sibling operations such as atera_update_ticket or atera_add_ticket_comment, and no prerequisites or permissions are stated.

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