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

Annotations already declare readOnlyHint=true, so safety is covered. The description adds the underlying endpoint ('Trengo: GET /labels'), which is useful provenance, but says nothing about pagination behavior or result ordering despite exposing a page parameter.

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 tight sentences with the resource front-loaded and the endpoint reference appended as a compact identifier. 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 simple read-only list tool with one optional parameter and a safe annotation profile, the description is nearly sufficient. The only gap is that no output schema exists, so the shape of returned labels and any pagination semantics are left unexplained.

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 100% and the single 'page' parameter is fully documented in the schema, so the description need not add syntax. It adds no meaning beyond the schema, making the baseline 3 appropriate.

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 (List) and resource (ticket labels/tags) scoped to the account, and clarifies the synonym 'tags' which aids matching. It does not explicitly differentiate from the many sibling list_* tools, but the resource noun makes it 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?

The phrase 'for filtering tickets and reports' implies downstream usage context, but there is no explicit statement of when to call this versus alternatives such as trengo_list_custom_fields or trengo_list_tickets, nor any prerequisite conditions.

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