navigate

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

The description simply says 'Navigate the page to a URL' and adds no behavioral detail beyond the destructiveHint annotation. It does not mention whether the tool waits for page load, resets state, or how it affects the current page, so it provides no additional transparency.

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, concise sentence that is easy to parse. It is appropriately front-loaded with the action and target, though it is arguably too minimal to earn a 5.

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 a simple one-parameter tool, this might seem sufficient, but the presence of sibling tools like browser_new_tab and browser_open creates ambiguity about the scope (current tab vs. new tab). The description does not resolve this, leaving the definition incomplete for correct tool selection.

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 single 'url' parameter has 0% schema description coverage, and the description only says 'to a URL' without adding any format, constraints, or meaning beyond the schema. The description fails to compensate for the lack of schema documentation.

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 ('navigate') and resource ('page') with a clear target (URL). It is unambiguous about the action, but it does not differentiate from sibling tools like browser_open or browser_new_tab, so it misses the top score.

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?

There is no guidance on when to use this tool versus alternatives such as browser_open or browser_new_tab. The description gives no context about the current tab vs. a new tab, leaving the agent to infer the intended use.

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