login_service

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

With no annotations, the description must disclose behavioral traits. It mentions launching browser and handling captcha, but does not explain side effects (e.g., state changes, network requests), failure modes (e.g., wrong credentials), or what happens to the browser session after login. Lacks sufficient transparency for a complex automation tool.

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, concise and front-loaded with the verb 'Automate'. It covers key aspects, though could be slightly more structured to list steps or side effects.

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 (browser automation, captcha), the description lacks completeness. No mention of success/failure indicators, return values (no output schema), or error handling. The tool's full behavior remains ambiguous, especially considering the number of sibling tools.

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?

Input schema has 100% coverage with clear descriptions. The description adds context ('handles captcha') aligning with the solveCaptcha parameter, but does not significantly enhance understanding beyond the schema. Baseline 3 is appropriate.

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 automates login using stored credentials, launching a browser and filling forms. It gives a good overview, but could better differentiate from composing individual sibling tools like browser_launch + click_submit + solve_captcha.

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?

No guidance on when to use this tool versus alternatives. Does not mention prerequisites (e.g., having a session from browser_launch) or that it should be used after credentials are stored. The parameters imply dependencies but description lacks explicit context.

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