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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds the notable behavioral detail that the caller must supply the last 4 digits of the customer's phone, i.e. an identity check — but it says nothing about failure behavior when the phone doesn't match, nor about rate limits.

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 short sentences, purpose first and requirements second, with no filler. Every clause carries information the agent needs.

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 lookup tool with no output schema, the description never indicates what the status response contains (state, timestamps, tracking) nor what happens when the order id / phone pair fails verification. Adequate to invoke, but incomplete for interpreting results.

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%, so the description carries the load — and it does name both parameters and clarify that phone_last4 is the last four digits of the customer's phone, not the full number. It still doesn't restate the integer type, minimum, or 4-digit pattern, but the semantic meaning of both params is conveyed.

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 names a specific resource (an order's status) and scopes it to an order 'placed earlier', which cleanly separates it from the place_order sibling. It lacks an explicit verb like 'retrieve' but the intent is unambiguous.

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 'placed earlier' implies this is for existing orders and the requirement of phone_last4 establishes an authentication precondition. However, no explicit when-to-use/when-not guidance or named alternatives (e.g. get_product for product info) are given; usage is only implied.

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