sign_in_to_garmin

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

Annotations only declare readOnlyHint=false, openWorldHint=true, destructiveHint=false. The description goes well beyond them by disclosing that a sign-in page opens in the user's browser, that credentials and MFA are entered there and never in chat, and that the agent must pause and wait for user confirmation before retrying. That is exactly the behavioral context an agent needs for a browser-based auth flow.

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?

Four sentences, each front-loaded and purposeful: purpose, trigger, mechanism, follow-up. Nothing is redundant and the most important routing condition appears early.

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 an auth tool with no parameters and no output schema, the description covers the trigger, the browser-based mechanism, the security constraint (no credentials in chat), and the required wait-and-retry loop. Nothing an agent needs to call and recover from this tool 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?

The tool takes zero parameters, so per the rubric the baseline is 4. There is nothing further the description could add on parameter semantics, and it correctly avoids inventing inputs.

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 states a specific verb+resource ('Sign in to Garmin Connect') and immediately distinguishes itself from the many data-retrieval siblings by being the authentication tool. An agent can tell at a glance this is the login entry point, not a data query.

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?

It gives an explicit trigger ('when another Garmin tool says you are not logged in or the session expired') and a complete post-action protocol ('ask the user to tell you when they have finished, then retry'). No inference is required about when to call it or what to do afterward.

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