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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so the safety profile is covered. The description adds genuinely new behavior: fixed 25-per-page pagination and, notably, that card data is redacted to scheme plus last four digits — a compliance-relevant detail an agent can't get elsewhere.

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?

Purpose and page size are front-loaded, followed by a compact field list; there is no filler. The trailing field enumeration is dense but each item earns its place as return-value disclosure, given no output schema exists.

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, enumerating returned fields (amount in base units, status_message/success, total_fees, chargebacks flag, etc.) fills the biggest gap and does so well. Missing only guidance on filtering and on total-count/termination behavior for pagination loops.

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?

Only one parameter and its schema description is fully covered (100%), including the next_page chaining hint, so the baseline is 3. The description's "25 per page" merely restates the schema's page-size note and adds no format or edge-case meaning.

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 ("List charges (card payments)") and grounds it with the underlying endpoint, GET /charges, which implicitly distinguishes it from pinpayments_list_customer_charges and pinpayments_search_charges. It never explicitly names those siblings, though, so an agent must infer the boundary from the endpoint.

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?

Provides no when-to-use or when-not guidance and never mentions the obvious alternatives (pinpayments_search_charges for filtered lookups, pinpayments_list_customer_charges for per-customer listing). The only navigation help is the schema's own "pass the previous reply's next_page", which lives in structured data, not the description.

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