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

Annotations already declare readOnlyHint=true, so safety is covered, and the description adds a genuinely useful non-obvious behavior: refunds appear as negative amounts. It still omits pagination/rate-limit behavior, but the refund convention is real added value beyond structured fields.

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?

Three short clauses, front-loaded with scope, then the refund convention, then the underlying endpoint. No filler and nothing redundant with the schema.

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 read-only list tool with full schema coverage and no output schema, the description covers scope, filtering, and refund sign semantics. Minor gaps remain (default ordering, whether paymentMethodOther is passed through), but nothing essential for correct invocation is missing.

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 100%, so the schema already documents all seven parameters in detail (RFC 3339 format, enum, pagination). The description only restates the time-period and payment-method filters, adding no syntax or semantics beyond the schema; baseline 3 applies.

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 payments received in a time period') plus optional scoping, which clearly separates it from a single-payment fetch. It does not, however, name or distinguish itself from close siblings like bookeo_get_payment or bookeo_list_booking_payments.

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 'optionally by payment method' clause implies when the tool is useful, but there is no explicit when-to-use guidance and no mention of the alternative siblings (get_payment for one payment, list_booking_payments for a booking's payments) that an agent must choose between.

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