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

Annotations already cover read-only, idempotent, non-destructive and closed-world, so the description's job is to add cost and scope, which it does: it flags the call as 'Free' and pins the behavior to a concrete endpoint (GET /v1/organization) scoped to 'the caller's' organization. It stops short of any auth, rate-limit or caching detail, but that is minor for a zero-param 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?

A single front-loaded sentence that names the resource, lists the returned fields, and appends endpoint plus cost. Every clause carries information and nothing repeats 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 and no parameters, the description must convey shape and safety on its own; annotations handle safety and the field list handles shape, so the agent knows both content and cost. The only real omission is the absence of routing guidance against the overlapping usage/account siblings.

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 no parameters, so there is no parameter meaning to convey and the baseline applies. Nothing in the description misleads about inputs.

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 and enumerates exactly what comes back: plan, credits remaining, usage, account status. That enumeration scopes it apart from generic siblings, though it never explicitly contrasts with get_account or get_usage_report, which overlap on the same nouns.

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 description reads as a data inventory, not guidance. There is no statement of when to prefer this over get_usage_report or get_account, which both return overlapping fields, and no prerequisites mentioned.

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