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 something the annotations do not: the required read_customers scope, which is real operational context for an agent planning calls. It stops short of describing the payload shape, keeping it at 4.

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?

Three short fragments, front-loaded with what is returned, then the permission, then the endpoint. Nothing meaningful is wasted, though the raw endpoint path is marginal information for an agent.

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 one-parameter read with no output schema, the description covers what is returned (points balance), the scope (one customer), and the auth requirement. It would be stronger if it sketched the response shape or noted behavior for a customer with no loyalty record.

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?

There is a single parameter with 100% schema description coverage, so the schema fully documents customer_id. The description only echoes the id position in the path template and adds no semantics beyond that — the baseline 3 for high-coverage schemas 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 precise resource and scope: the loyalty points balance (not the customer record) for exactly one customer. An agent can distinguish it from easystore_get_customer, though the description never names that sibling explicitly, which keeps it from a 5.

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?

'Needs read_customers' gives a prerequisite, and 'one customer' implies this is the per-customer lookup rather than a list. There is no explicit statement of when to prefer this over easystore_get_customer or easystore_search_customers, and no exclusions.

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