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FutureAtoms

Agentic Control Framework (ACF)

by FutureAtoms

browser_navigate

Navigate to any URL programmatically as part of automated workflows.

Instructions

Navigate URL

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYes

Implementation Reference

  • The main handler function for browser_navigate. Uses Playwright to navigate a page to a given URL, waits for 'domcontentloaded', and returns success with the current URL and page title, or an error message.
    async function browserNavigate(url) {
      try {
        if (!url) {
          return {
            success: false,
            message: 'URL is required'
          };
        }
    
        const page = await getPage();
        
        // Navigate with timeout
        await page.goto(url, {
          waitUntil: 'domcontentloaded',
          timeout: config.timeout
        });
    
        return {
          success: true,
          message: `Navigated to ${url}`,
          url: page.url(),
          title: await page.title()
        };
    
      } catch (error) {
        logger.error(`Error navigating: ${error.message}`);
        return {
          success: false,
          message: error.message
        };
      }
    }
  • Input schema definition for browser_navigate in the MCP server's tool registry. Requires a 'url' string property.
    { name:'browser_navigate', description:'Navigate URL', inputSchema:{ type:'object', properties:{ url:{type:'string'} }, required:['url'] } },
  • Tool registration: browser_navigate is listed in the server's tools array with description and input schema.
    { name:'browser_navigate', description:'Navigate URL', inputSchema:{ type:'object', properties:{ url:{type:'string'} }, required:['url'] } },
    { name:'applescript_execute', description:'Run AppleScript (macOS)', inputSchema:{ type:'object', properties:{ code_snippet:{type:'string'}, timeout:{type:'number'} }, required:['code_snippet'] } }
  • Dispatch case in the MCP server's tool call handler that invokes browserTools.browserNavigate(args.url) when 'browser_navigate' is called.
    case 'browser_navigate': data = await browserTools.browserNavigate(args.url); break;
  • Export of browserNavigate from browser_tools.js module.
    module.exports = {
      // Navigation
      browserNavigate,
      browserNavigateBack,
      browserNavigateForward,
Behavior2/5

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

With no annotations, the description carries the full burden of behavioral disclosure, but it provides none. It does not mention what happens during navigation (e.g., page load time, state changes, error handling) or any side effects. The description only restates the action without any behavioral traits.

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

Conciseness2/5

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

The description is extremely concise (two words) but at the cost of informativeness. It is not appropriately sized because it omits essential context that could fit in a short phrase. While it wastes no words, it fails to provide a minimally useful definition.

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

Completeness1/5

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

Given the absence of an output schema and annotations, the description is the sole source of completeness. It fails to explain return values, side effects, or how navigation affects the browser state. The single parameter is not elaborated, and no information is given about expected behavior or error conditions. The description is grossly incomplete for a core browser action.

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

Parameters1/5

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

The input schema has one required parameter 'url' with no description, and schema description coverage is 0%. The description 'Navigate URL' adds no additional meaning beyond the parameter name; it does not specify format, example values, or any constraints. This leaves the agent with insufficient guidance on how to construct the URL parameter correctly.

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

Purpose3/5

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

The description 'Navigate URL' clearly states the action (navigate) and the resource (URL). It distinguishes itself from sibling tools like 'browser_navigate_back' and 'browser_navigate_forward' by not specifying a direction, but it does not explicitly say it is for entering a new URL. The description is adequately clear but does not provide additional context about the nature of navigation.

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?

There is no guidance on when to use this tool versus alternatives such as browser_navigate_back or browser_navigate_forward. No context is provided about prerequisites, typical use scenarios, or cases where this tool should be avoided. The agent must infer usage from the name and parameter alone.

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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