login

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

Discloses reading env vars and returning a URL, but omits details like success behavior (e.g., token storage) and error handling (e.g., missing env vars).

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 sentences, no wasted words. Purpose first, then behavioral detail. Efficient and clear.

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?

Covers essential behavior given no parameters or output schema. Missing post-login state changes (e.g., session handling) but adequate for a simple login tool.

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?

No parameters exist, so the description adds no param info beyond the schema. Baseline 4 for zero parameters.

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 tool logs in to Marriott Bonvoy and specifies it reads environment variables or returns a URL for manual login. This differentiates it from sibling tools like logout.

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 use before other authenticated actions but does not explicitly state when to use versus alternatives. It lacks guidance on when manual login is needed.

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