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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds that results include per-service enablement flags, which is useful return-content context, but says nothing about pagination behavior or result ordering. With annotations carrying the safety burden, a 3 is appropriate.

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 that leads with the resource and its returned fields, then the endpoint. Slightly awkward phrasing ('with which services are on') but no waste.

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 and seven optional filter parameters, the description should at minimum signal that the tool is filterable and paginated. It covers the resource and returned service flags but leaves filtering and paging strategy to the schema, which is adequate but thin for a list tool of this 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 all seven parameters are already documented in the schema, including the partial-match and exact-match semantics of name and fiscal_id and the paging hint. The description adds no filtering syntax or semantics beyond that, so the baseline of 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?

The description names the resource (businesses / fiscal ids on the account) and enumerates the service flags returned (customer invoices, supplier invoices, receipts, signature, legal storage), plus the underlying endpoint. It is clearly a list operation and reads distinctly from acube_get_business_registry_configuration, though it never states the list-vs-single relationship 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?

There is no guidance on when to call this versus acube_get_business_registry_configuration or acube_verify_fiscal_id, and no mention that the tool supports filtering by name, email, fiscal id, or service flags — even though seven such parameters exist. The agent must discover all selection logic from the schema alone.

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