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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so safety is covered. The description adds the underlying REST path and nothing else — no pagination behavior, no note about result ordering or volume — so it adds modest context beyond structured fields.

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 sentence with the key cross-tool id provenance front-loaded, followed by the endpoint. No filler; the endpoint is slightly noisy but serves as a grounding reference.

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 read-only paginated list with no output schema, the description covers purpose and id sourcing but says nothing about what a subscription record contains or how result sets behave (e.g., default status filtering). Adequate but leaves gaps an agent may need to discover at call time.

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 coverage is 100%, so the baseline is 3, but the description earns extra credit by explaining exactly where customer_id comes from across two sibling tools (`custRel.id` vs `id`), a cross-tool detail the schema cannot express. It does not elaborate on status or paging, which the schema already documents.

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 scoped to a single customer, which implicitly separates it from the sibling smartrr_list_subscriptions (all subscriptions). The endpoint path reinforces the per-customer scope, though it never explicitly names the alternative tool.

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?

Gives the provenance of customer_id (from smartrr_list_subscriptions `custRel.id` or smartrr_list_customers `id`), which implies when this tool is applicable. However, it never states when to prefer this over smartrr_list_subscriptions or what to do if the customer id is unknown, so 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.