purchase_analytics

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

No annotations are supplied, so the description carries the full burden, and it discloses only the auth prerequisite ('Requires login'), which is genuinely useful. It says nothing about whether the call is read-only, what the 'first order' and 'delivery pass' states mean, or what happens when the user has neither.

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?

It is short and front-loads the login requirement, so there is no wasted padding. However, the colon-and-fragment style ('first order, ongoing delivery pass') is compressed to the point of being unparseable, trading clarity for brevity rather than earning conciseness.

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?

An output schema exists, so return values need not be explained, and with zero parameters the structural burden is low. Even so, the core semantic question – what 'purchase analytics' actually reports and when an agent should reach for it – is left unanswered, which is too thin for a tool competing with a dozen order- and delivery-related siblings.

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?

The tool takes zero parameters, so there is no parameter semantics for the description to add; the baseline of 4 applies. The empty schema imposes no documentation debt that the description neglects.

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 reads as a note fragment ('Online-shopping status: first order, ongoing delivery pass') rather than a verb+resource statement, and it never reconciles the name 'purchase_analytics' with those two cryptic labels. An agent cannot tell whether this returns an order-history summary, a subscription/delivery-pass flag, or eligibility state, and no sibling is referenced for contrast.

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?

There is no when-to-use guidance at all – nothing distinguishes it from neighbours like my_orders, last_order, delivery_info, or order_authorization_state. The only conditional content is 'Requires login', which is a prerequisite rather than a usage rule.

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