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

No annotations are provided, so the description carries the transparency burden. It discloses that the signing key is redacted in the response, which is a useful behavioral detail. However, it does not mention other behaviors such as authentication requirements, error conditions, or response format beyond the redaction note.

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?

The description is a single, front-loaded sentence that conveys the core action and a key output detail. No filler words or redundant information.

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 read operation with one parameter and no output schema, the description provides the essential purpose and a notable output caveat. However, it does not describe the full returned subscription object or any side effects, leaving some gaps for an agent to infer.

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 schema has a single 'id' parameter with no description (0% coverage). The tool description does not explain what 'id' refers to or its expected format, although the context of 'subscriptions' implies it is the subscription identifier. This falls short of compensating for the lack of schema documentation.

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 the specific verb 'Read' with the resource 'subscriptions', making the operation clear. The parenthetical 'signing_key redacted' adds a distinctive detail that helps differentiate from related tools like 'list_subscriptions' or 'delete_subscription'.

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 phrasing 'one of your subscriptions' implies this is for reading a single subscription, contrasting with the sibling 'list_subscriptions' for multiple. However, it does not explicitly mention alternatives or when not to use, so guidance is implicit rather than explicit.

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