authenticate_garmin

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions authentication and environment variable usage, but fails to describe critical behaviors such as what happens on success (e.g., session token storage), error handling, rate limits, security implications, or whether this is a one-time or recurring operation. This leaves significant gaps for an AI agent to understand the tool's full behavior.

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, efficient sentence that directly states the tool's purpose and key feature (environment variable support). It is front-loaded with essential information and contains no redundant or unnecessary details, making it highly concise and well-structured.

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?

Given the complexity of authentication (a critical operation with security implications), no annotations, and no output schema, the description is incomplete. It lacks details on behavioral outcomes (e.g., what is returned, how sessions are managed), error cases, prerequisites, or integration with sibling tools. This leaves the AI agent with insufficient context to use the tool effectively and safely.

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 has 100% description coverage, clearly documenting both parameters as optional with environment variable fallbacks. The description adds minimal value beyond this by reiterating the use of username and password with environment variables, but does not provide additional semantic context (e.g., format requirements, authentication flow details). This meets the baseline score since the schema 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 with Garmin Connect') and the method ('using username and password'), which is specific and actionable. However, it does not explicitly differentiate this authentication tool from other sibling tools that might also require authentication or handle credentials differently, such as 'custom_garmin_request' which could involve authentication in a broader context.

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 usage when authentication is needed, as it mentions environment variables as an alternative, but it does not provide explicit guidance on when to use this tool versus other tools (e.g., whether other tools automatically handle authentication or require this tool first). No exclusions or clear alternatives are stated, leaving usage context somewhat vague.

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