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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds that the resource is 'tracked subscriptions' and which fields are returned, but it does not disclose additional behavioral traits such as ordering, pagination, or any implicit scoping. This meets the baseline without going beyond.

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 with no filler. The main function is front-loaded, and the optional filtering instruction is placed exactly where it is needed. Every word earns its place.

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 simple, optional-parameter read-only list tool with a fully described input schema and an output schema available, the description is sufficient. It names the resource, the key output fields, and the filtering mechanism; nothing essential is missing.

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% and the status parameter already has a clear enum and description. The description's 'Pass status to filter to one' restates what the schema says, adding no new semantic detail. Baseline 3 is appropriate.

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 uses a specific verb ('List') and a concrete resource ('tracked subscriptions'), and enumerates the returned attributes: fee, renewal schedule, and status. This clearly distinguishes it from the other list_* siblings by resource and makes its function immediately understandable.

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 description gives no guidance on when to choose this tool over alternatives or what prerequisites apply. It only says to pass status for filtering, which is parameter-level guidance rather than tool-selection guidance. Unlike a description that names an alternative, it leaves the agent to infer its place.

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