Navigate to a URL

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

Annotations already set 'destructiveHint: true' and 'openWorldHint: true', which signal that this operation can change state (navigate away) and may open external sites. The description does not add any behavioral context beyond what annotations provide—it does not mention page load behavior, error handling, or impact on the current page state. With annotations covering the core behavioral hints, a 3 is appropriate (adds no extra value).

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 one short sentence, but it is under-specified rather than concise. It fails to provide necessary details about behavior, parameters, or sibling differentiation. Every sentence should earn its place; one tautological sentence does not justify its existence.

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 that there are 22 sibling tools, no output schema, and only 50% parameter description coverage, the description is inadequate. The agent lacks information about navigation behavior, error states, return values, and how this tool fits into the browser automation workflow. A more complete description would mention page-load completion, redirect handling, or domain restrictions.

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?

Schema description coverage is 50% (only 'url' is described). The description does not elaborate on the 'url' parameter's format (e.g., must include scheme, relative vs absolute) nor explain the optional '_meta' field's purpose. Since coverage is moderate (50%), the description adds minimal value beyond the schema, and the baseline starts at 3.

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?

Tautological: description restates name/title.

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 provides no guidance on when to use this tool versus alternatives. There is no mention of prerequisites (e.g., an active browser tab), no indication of when to prefer 'browser_navigate_back' or other navigation tools, and no exclusion cases. The agent receives zero contextual help for decision-making.

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