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

No annotations are provided, so the description carries the full behavioral burden. It implies a read ('Returns a list') and states the return is 'a json object', but discloses nothing about auth requirements beyond parameter provenance, pagination, result limits, empty-wallet behavior, or whether card data is masked or sensitive.

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 opening sentence is duplicated verbatim, which is pure waste, and the remaining content is a Java-doc-style parameter block. It is short and parseable but not front-loaded or edited.

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-list tool with three required params and no output schema, the description covers inputs and general intent, but leaves return shape, pagination and error/auth conditions unstated. Adequate but with clear gaps.

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 largely does: it explains all three parameters, including where token and wallet_fk originate (/access/login) and that api_key is the application key. It stops short of format/type detail (e.g. wallet_fk is an integer) but adds real provenance value beyond an empty 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?

States a specific verb and resource: 'Returns a list of tokenised Visa/Mastercard(s) associated with this wallet.' The resource ('tokenised cards') distinguishes it from neighboring list tools like wallet_assets_list, wallet_accounts_list and wallet_voucher_list, though it never names those siblings explicitly.

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?

No when-to-use or when-not-to-use guidance, no prerequisites, no mention of alternatives such as wallet_card_remove or paywall__wallet_visa_mastercard_card_list. The only contextual hook is that token/wallet_fk come from /access/login, which is provenance rather than usage guidance.

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