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

readOnlyHint=true already declares this is a safe read, so the description only needs to add context. It usefully clarifies that only the LATEST assignment is returned (not the full history) and exposes the underlying REST endpoint, but says nothing about failure behavior when no plan is assigned or the shape of the response.

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: the purpose and the distinguishing 'LATEST' qualifier are front-loaded, and the endpoint follows as supporting detail. Nothing is redundant or 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 one-parameter read-only tool this is nearly sufficient, but with no output schema the description gives only '(pricing)' as an indication of what is returned and omits the no-plan-assigned edge case. An agent knows how to call it but not fully what to expect back.

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 single parameter has 100% schema description coverage ('The Amberflo customerId.'), so the schema carries the semantics. The description restates the query string form CustomerId=<id>, which adds a little transport detail but no new meaning beyond the schema.

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 (get a customer's assigned product plan) and adds the qualifier 'LATEST', which meaningfully distinguishes it from the sibling amberflo_list_customer_plan_history. It stops short of naming the sibling explicitly, but an agent can infer the boundary.

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?

Usage is only implied: 'LATEST' signals this is the current-plan lookup versus the history listing, but there is no explicit when-to-use statement, no mention of prerequisites (e.g. the customer must have a plan assigned), and no named alternative.

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