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VikashLoomba

MCP-Server-Playwright

browser_navigate

Navigate to a specified URL in a browser environment to load web pages for interaction or inspection.

Instructions

Navigate to a URL

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYes

Implementation Reference

  • index.ts:22-23 (registration)
    Enum definition registering browser_navigate as ToolName.BrowserNavigate
    enum ToolName {
      BrowserNavigate = "browser_navigate",
  • Tool definition with input schema for browser_navigate: requires a 'url' string parameter
    const TOOLS: Tool[] = [
      {
        name: ToolName.BrowserNavigate,
        description: "Navigate to a URL",
        inputSchema: {
          type: "object",
          properties: {
            url: { type: "string" },
          },
          required: ["url"],
        },
      },
  • Handler implementation: calls page.goto(args.url) to navigate to the URL and returns success message
    case ToolName.BrowserNavigate:
      await page.goto(args.url);
      return {
        content: [{
          type: "text",
            text: `Navigated to ${args.url}`,
          }],
        isError: false,
      };
Behavior1/5

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

No annotations are provided, and the description omits behavioral details like whether the navigation waits for the page to load, handles errors, or replaces the current page. The description carries the full burden but provides none.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single concise sentence with no wasted words. However, it could benefit from a structure that includes the action and context without being verbose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simplicity of the tool (one parameter, no output schema), the description is minimal but incomplete. It does not cover important aspects like error handling, loading behavior, or tab management, which an agent might need.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description adds minimal value beyond the input schema; it implies the 'url' parameter is the target URL, but does not explain format, restrictions, or default behavior. With 0% schema coverage, more detail is needed.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Navigate to a URL' clearly states the action and resource, and it distinguishes this tool from siblings like browser_click and browser_fill, which perform different actions.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives, such as when to navigate versus evaluate or wait. The description does not mention context or prerequisites.

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

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