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

With no annotations, the description carries the full disclosure burden and does well: it states live mainnet behavior, OR eligibility semantics, accepted/expired credential rules, and 'Free, no signup' for auth. It does not mention return format or error behavior, which prevents a 5.

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 description is compact and informative, with useful facts front-loaded: mainnet live, OR logic, params, and no signup. The rhetorical phrase 'the question every domain operator...' adds flavor but not function, slightly reducing conciseness.

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 simple read-only eligibility check with two required params and no output schema, the description covers the core semantics well: what is checked, the OR condition, live mainnet behavior, and auth requirements. It omits explicit return value/error details, which would make it more complete.

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 coverage is 100%, so the baseline is 3. The description mostly restates the schema's parameter info, but it adds meaningful interaction semantics: 'Eligibility is OR: any ONE accepted, unexpired credential matching the domain's AcceptedCredentials is enough', clarifying how wallet_address and domain_id relate.

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 specific verb and resource: 'Check whether an XRPL account holds a credential that satisfies a PermissionedDomain (XLS-80d)'. This clearly differentiates the tool from siblings like check_xrpl_score, check_mpt_risk, and get_account_credentials by focusing on PermissionedDomain eligibility.

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 gives clear context: it is the check 'before a real transaction' and operates 'against a validated mainnet ledger'. It does not explicitly name alternative tools or state when not to use it, so it stops short of a 5, but the intended use case is clear.

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