Skip to main content
Glama
jomon003

PlayMCP Browser Automation Server

by jomon003

navigate

Directs a web browser to a specific URL, enabling automated web page access for testing, scraping, or interaction tasks.

Instructions

Navigate to a URL

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYes

Implementation Reference

  • Core handler function that performs the browser navigation using Playwright's page.goto() method.
    async navigate(url: string): Promise<void> {
      try {
        if (!this.isInitialized()) {
          throw new Error('Browser not initialized');
        }
        this.log('Navigating to', url);
        await this.state.page?.goto(url);
        this.log('Navigation complete');
      } catch (error: any) {
        console.error('Navigation error:', error);
        throw new BrowserError('Failed to navigate', 'Check if the URL is valid and accessible');
      }
    }
  • MCP tool dispatch handler in callTool that validates input and invokes the controller's navigate method.
    case 'navigate': {
      if (!args.url || typeof args.url !== 'string') {
        return {
          content: [{ type: "text", text: "URL is required" }],
          isError: true
        };
      }
      await playwrightController.navigate(args.url);
      return {
        content: [{ type: "text", text: "Navigation successful" }]
      };
    }
  • Tool schema definition including name, description, and input schema requiring a 'url' string.
    const NAVIGATE_TOOL: Tool = {
      name: "navigate",
      description: "Navigate to a URL",
      inputSchema: {
        type: "object",
        properties: {
          url: { type: "string" }
        },
        required: ["url"]
      }
    };
  • src/server.ts:516-516 (registration)
    Registration of the navigate tool in the tools object passed to MCP server capabilities.
    navigate: NAVIGATE_TOOL,
Behavior1/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. 'Navigate to a URL' implies a navigation action but fails to specify whether this opens a new browser, loads in an existing session, requires prior setup (e.g., via 'openBrowser'), handles errors, or has side effects like page reloads. This lack of detail makes it inadequate for safe and effective use.

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

Conciseness5/5

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

The description is a single, front-loaded sentence with zero wasted words—'Navigate to a URL' is maximally concise. It directly states the action without unnecessary elaboration, making it easy to parse quickly.

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 complexity of a navigation tool with no annotations, no output schema, and minimal parameter documentation, the description is incomplete. It lacks details on behavioral traits (e.g., interaction with browser state), error handling, and integration with sibling tools like 'openBrowser', leaving significant gaps for the agent to operate effectively.

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

Parameters4/5

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

With 0% schema description coverage and only one parameter ('url'), the description implicitly defines the parameter's purpose as the target URL for navigation. This adds essential meaning beyond the bare schema, though it doesn't elaborate on format constraints (e.g., must be a valid HTTP/HTTPS URL). The baseline is high due to the minimal parameter count.

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 to a URL' clearly states the verb ('navigate') and resource ('URL'), making the basic purpose understandable. However, it doesn't distinguish this tool from potential alternatives like 'goForward' or 'getPageUrl' among its siblings, leaving the scope vague regarding whether this initiates navigation or just changes the current page view.

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?

The description provides no guidance on when to use this tool versus alternatives. With siblings like 'goForward' (for browser history) and 'getPageUrl' (for retrieving the current URL), there's no indication of context, prerequisites, or exclusions, leaving the agent to infer usage from the tool name alone.

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

Install Server

Other Tools

Latest Blog Posts

MCP directory API

We provide all the information about MCP servers via our MCP API.

curl -X GET 'https://glama.ai/api/mcp/v1/servers/jomon003/PlayMCP'

If you have feedback or need assistance with the MCP directory API, please join our Discord server