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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds genuine context the annotations do not: the paginated response envelope { results, count, has_more, next_cursor } and the underlying GET /v1/transactions endpoint, which tells the agent how to page and what to expect.

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?

One front-loaded sentence carrying the filter dimensions, followed by the return shape and endpoint. No filler, no repetition of the title, and the most decision-relevant information (what is listed, what can be filtered) comes first.

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 13-parameter, zero-required list tool with no output schema, the description covers purpose, filters, pagination return shape, and endpoint; annotations cover the read-only safety profile. It is close to complete, with only the relationship to the single-transaction sibling left implicit.

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 every parameter is already documented with enum values, defaults, and ISO 8601 patterns. The description restates the filter dimensions (type, status, customer, territory, dates) but adds no syntax, default, or interaction detail beyond the schema, so the baseline of 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 payment transactions') and enumerates the filterable dimensions, which cleanly separates it from the singular sibling zenbooker_get_transaction and from list_invoices/list_customers. An agent can identify the tool's scope without opening the schema.

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?

Usage is implied by the word 'optionally' plus the filter list, but the description never states when to prefer this over zenbooker_get_transaction (single lookup) or how it relates to other list tools. No exclusions or prerequisites are given.

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