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

No annotations are provided, so the description carries the full burden. It usefully discloses two behavioral traits: wallet_fk 'may not be 0' and account_fk=0 returns all beneficiaries for the wallet. However, it says nothing about auth requirements beyond the token/api_key parameters, read-only nature, or pagination limits.

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?

The leading sentence is duplicated verbatim, and the JSDoc-style @param/@return boilerplate is retained, which is wasteful and not front-loaded cleanly. The content is not excessive in length, but the duplication undermines structure.

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?

For a four-required-parameter list tool with no output schema and no annotations, the description covers inputs adequately but reduces the return to 'a json object' with no indication of the beneficiary fields or pagination. It is minimally sufficient but leaves return-shape questions unanswered.

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 0%, so the description must compensate, and it does: it documents all four parameters, clarifies that account_fk is a database int not an address and may be 0, and notes wallet_fk must be non-zero. It adds genuine meaning beyond the bare type declarations in the schema.

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 states a clear verb and resource: 'Lists all beneficiaries' on a wallet or account. It is distinguishable from the sibling write operations beneficiary_add and beneficiary_remove, but it offers no explicit differentiation from other list tools such as wallet_accounts_list. Clear but not sibling-differentiated.

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 when-to-use guidance or mention of alternatives, prerequisites, or scoping decisions (e.g., when to scope by account_fk vs. wallet_fk). The agent must infer usage from the parameter names alone.

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