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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety and side-effect profile is fully covered. The description adds nothing beyond that — no pagination behavior, no total-count or ordering information, no note that results are bounded by the closed Losali directory.

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?

A single front-loaded sentence with zero filler; the resource and scope are stated immediately. It is arguably terse to the point of omitting useful context, but nothing in it is redundant or wasted.

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 zero-required-parameter list tool with a fully documented schema this is close to sufficient. However, there is no output schema, so the description should say what a result entry looks like and whether pagination metadata is returned — that gap leaves an agent guessing about the response shape.

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%, so the schema already documents q, page and per_page including their defaults and bounds. The description adds no filtering syntax, matching behavior, or paging guidance beyond what the schema provides, so the baseline 3 applies.

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 ('Lister') and resource ('services / entreprises') scoped to the Losali directory, so an agent knows it enumerates directory entries rather than fetching one. It does not explicitly contrast itself with siblings like get_brand or search_numbers, but the singular/plural distinction makes the split reasonably inferable.

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 when-to-use guidance, no prerequisites, and no mention of alternatives. The description never says when an agent should browse with list_brands versus filtering with search_numbers or fetching a single entry with get_brand, leaving routing entirely to inference from the tool name.

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