authenticate_coros

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

The description states the side effect 'store the access token', which is consistent with the annotations (readOnlyHint: false). It adds context about the state change, but does not elaborate on token expiration, overwriting behavior, or prerequisites. With annotations already covering the non-read-only nature, this is adequate but not rich.

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, tightly written sentence that is front-loaded with the action and resource. There is zero waste, and it shares the essential purpose without unnecessary detail.

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?

The description combined with the rich schema and annotations provides a fairly complete picture for an authentication tool. The existence of an output schema covers return values, and the schema details the region-bound tokens and password hashing. However, it lacks an explicit statement that this tool must be called before other API calls, making the context slightly incomplete.

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 input schema provides 100% coverage for all three parameters, including detailed descriptions for region and password handling. The description adds no additional parameter semantics, so the baseline score of 3 applies as the schema already does the heavy lifting.

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 clearly states the action ('Authenticate') and the resource ('Coros Training Hub API') along with the outcome ('store the access token'). It distinguishes itself from the sibling 'authenticate_coros_mobile' by specifying the Training Hub API, making the purpose unambiguous.

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 implies this tool is used to authenticate before accessing other API endpoints, but it does not explicitly state when to use it versus alternatives like 'check_coros_auth' or 'authenticate_coros_mobile'. There is no explicit when/when-not guidance, only the implied context that it is the primary authentication method.

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