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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds useful context beyond that: the raw endpoint (GET /api/v3/account), the cost/latency hint ("cheap"), and the fact that the result is scoped to the caller's own key. It does not mention rate limits or auth scope detail, which are minor for a zero-argument read.

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 plus an endpoint reference; the scope and returned fields are front-loaded and every clause carries information. No padding or restatement of the title.

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 available, the description compensates by listing the payload contents (company name, plan, country, timezone). Combined with the safety annotation and zero-parameter schema, an agent has everything needed to call and interpret this tool.

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 per the rubric the baseline is 4. There is nothing for the description to disambiguate, and it correctly adds no spurious argument discussion.

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 (Fetch) and resource (the Atera account this key belongs to), and even enumerates the fields returned: company name, plan, country and timezone. An agent can distinguish it from atera_get_customer or atera_get_agent because the scope is explicitly tied to the API key's own account.

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?

"A cheap way to confirm the key works" gives a concrete when-to-use scenario (credential validation). It stops short of naming alternatives or stating when *not* to use it (e.g. versus atera_get_customer for customer-level detail), so it is clear context without exclusions.

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