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

No annotations are provided, so the description carries the full burden. It conveys that this is a mutating cancellation, but says nothing about reversibility, idempotency, what happens if the order is already filled, or permission/auth requirements for a destructive operation.

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?

A single short sentence with the action front-loaded and no filler. It is efficient, though its brevity edges toward under-specification rather than deliberate minimalism.

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 destructive, single-param operation with no annotations and no output schema, the definition is thin: no auth expectations, no behavior on invalid/already-filled orders, and no indication of what a successful cancellation returns. It leaves the agent with unresolved questions before invoking.

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% and there is one parameter, so the description must compensate for the undocumented order_id. It adds no format, ID-vs-symbol, or scoping detail beyond the bare param name, which is a meaningful gap for a mutation keyed on an identifier.

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?

The description gives a specific verb (cancel) and resource (order), and the singular 'an ... order' implicitly separates it from the sibling pax.cancel_all_orders. It is clear what the tool does, though it stops short of explicitly naming the sibling it is not.

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 phrase 'open or partially-filled' implies the precondition for calling it, so usage is inferable rather than stated. There is no explicit when-not guidance and no pointer to pax.cancel_all_orders or other alternatives, leaving the agent to infer routing.

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