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

readOnlyHint=true already tells the agent this is a safe read, so the description only needs to add context; it does add the underlying endpoint (GET /accounts/{accountId}/membershiplevels) and the field set, but says nothing about permissions, pagination, or ordering.

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 sentence, front-loaded with the verb and resource, followed by the most decision-relevant attributes and the API reference. No filler.

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, the description usefully previews the return fields, which is the main thing an agent needs for a zero-param listing. Minor gap: it never explains the accountId referenced in the endpoint, so the auth/account scoping model stays implicit.

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 the baseline is 4 per the rubric. The description adds nothing to explain the accountId shown in the endpoint path, leaving a small ambiguity about whether the account is inferred from auth context.

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+resource ('List membership levels') and enumerates the salient fields returned (name, fee, renewal period, individual vs bundle, public applicability), which is enough to distinguish it from the nearby wildapricot_list_member_groups sibling without opening a schema.

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 by the resource name; there is no statement of when to call this versus list_member_groups or list_contacts, and no prerequisite like accountId sourcing (even though the endpoint shows an accountId path parameter). Adequate for an obvious read-only listing, but no explicit routing guidance.

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