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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds a genuinely non-obvious behavioral detail: the synthetic department -1 'All' is included in the results, which prevents an agent from misinterpreting or double-counting it. It does not discuss result ordering or limits, but for a 0-param lookup that is minor.

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 with nothing extraneous. The returned-field list comes first and the caveat about -1 follows, both front-loaded and easy to scan.

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?

With no output schema, the description carries the burden of describing the response, and it does give the three fields plus the synthetic -1 entry. It stops short of stating whether the list is paginated or sorted, but for a simple reference-data list that is a modest gap.

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 nothing for the description to disambiguate. The field list describes output rather than input, which is a reasonable substitute given no output schema exists.

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 identifies the resource (company departments) and enumerates the returned fields (id, name, description), which lets an agent tell it apart from gocanvas_list_department_users or gocanvas_list_groups. It lacks an explicit verb, but combined with the title 'List GoCanvas departments' the intent is unambiguous.

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?

There is no explicit statement of when to call this versus alternatives (e.g., to resolve a department id before calling gocanvas_list_department_users), so usage is only implied by the resource name. The note about the -1 'All' pseudo department is the closest thing to actionable guidance.

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