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

readOnlyHint=true already tells the agent this is a safe, non-mutating read. The description adds the upstream endpoint mapping (GET /api/4/orders) but says nothing about result shape, result limits, or how pagination/total counts behave beyond what the schema already documents for page and page_size.

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?

Two tight sentences with the core action front-loaded, followed by the filter surface and the endpoint. The filter enumeration is partly redundant with the schema, but it is structured and readable rather than padded.

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 all 13 parameters fully documented and pagination covered in the schema, the description supplies what is missing: the filterable dimensions and the underlying API. The absence of an output schema means return shape/pagination semantics remain unstated, which is the main residual gap.

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 one of the 13 parameters is already documented, including the enum values and ISO 8601 formats. The description restates the filter categories at a high level and adds only the useful note that free-text search covers order number, customer name/email/address, tags and custom fields. Baseline 3 is correct when the schema does the heavy lifting.

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 rental orders") and enumerates the filterable dimensions, which clearly separates it from singleton siblings like booqable_get_order. It stops short of naming a sibling alternative explicitly, so it is clear but not maximally differentiating.

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 filter list implies the tool is for browsing/searching orders, and it is obvious enough that listing pairs with booqable_get_order. But there is no explicit when-to-use statement, no guidance on when not to use it (e.g. when you already have an id), and no alternatives named.

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