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

readOnlyHint=true already declares the safety profile, so the description only needs to add context — it contributes the pagination behavior and the underlying endpoint (GET /api/v3/customers). It says nothing about rate limits, result ordering, total-count metadata, or error behavior, so the added value is modest.

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, zero filler, with the core purpose front-loaded and the endpoint reference trailing as secondary context. Nothing redundant or misplaced.

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?

There is no output schema, so the description would ideally indicate what a customer record contains or that pagination metadata is returned; it does neither. For a simple read-only list with full parameter coverage this is still workable, but the return-shape gap keeps it at minimum-viable.

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%: both 'page' and 'items_in_page' are documented with types, bounds and defaults. The description only restates that results are paginated, adding no format or interaction detail beyond the schema, 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 and resource — 'List the customers (client companies) managed in Atera' — and even adds the domain noun disambiguation '(client companies)' plus 'paginated'. It does not explicitly name the sibling it contrasts with (atera_get_customer for a single customer), so it stops short of a 5.

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?

Usage is only implied: the word 'paginated' hints at bulk enumeration, but there is no explicit when-to-use vs when-not, no pointer to atera_get_customer for single-record retrieval, and no guidance on looping pages. Adequate but leaves selection to inference.

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