login

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

With no annotations, the description carries the behavioral disclosure burden. It explicitly mentions that a browser will be opened and that authentication tokens are saved, which are key side effects. However, it does not specify whether the tool requires user interaction or blocks until login completes, leaving a minor gap.

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 sentence that directly states the core purpose. It contains no fluff or redundant details, making it highly concise and well-structured for quick comprehension.

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 tool's simplicity (no parameters, no output schema), the description provides adequate context for its purpose and side effects. It could be enhanced by stating that login is a prerequisite for other tools, but this is a minor omission for such a basic operation.

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 has zero parameters, and the schema is empty. According to the rubric, a baseline of 4 is appropriate when there are no parameters, as there is nothing to explain. The description focuses on the action rather than inputs, which is sufficient.

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's function: 'Open a browser to log in to Velog and save authentication tokens'. The verb 'log in' plus the resource 'Velog' and the specific action of saving tokens distinguish it from sibling tools like get_user_posts or write_post.

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 the tool is used to authenticate for Velog operations, but it does not explicitly state when to use it (e.g., 'before other tools') or exclude alternatives. Since no alternative login tools exist, the usage context is inferred but not directly stated.

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