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cploujoux

Puppeteer MCP Server

by cploujoux

puppeteer_navigate

Automate browser navigation by directing to a specified URL, enabling interaction with web pages in a real browser environment using Puppeteer-based automation tools.

Instructions

Navigate to a URL

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYes

Implementation Reference

  • Handler implementation for the puppeteer_navigate tool, which navigates the Puppeteer page to the specified URL and returns a success message.
    case "puppeteer_navigate":
      await page.goto(args.url);
      return {
        content: [
          {
            type: "text",
            text: `Navigated to ${args.url}`,
          },
        ],
        isError: false,
      };
  • Tool schema definition including name, description, and input schema requiring a 'url' string.
    {
      name: "puppeteer_navigate",
      description: "Navigate to a URL",
      inputSchema: {
        type: "object",
        properties: {
          url: { type: "string" },
        },
        required: ["url"],
      },
    },
  • index.ts:459-461 (registration)
    Registration of all tools, including puppeteer_navigate, via the TOOLS array in the ListToolsRequestSchema handler.
    server.setRequestHandler(ListToolsRequestSchema, async () => ({
      tools: TOOLS,
    }));
  • index.ts:463-465 (registration)
    Registration of the CallToolRequestSchema handler, which dispatches to the specific tool handler via handleToolCall switch statement.
    server.setRequestHandler(CallToolRequestSchema, async (request) =>
      handleToolCall(request.params.name, request.params.arguments ?? {})
    );
Behavior2/5

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. It states the action ('Navigate to a URL') but does not explain key behaviors such as whether it waits for page load, handles redirects, timeouts, or errors, or if it requires authentication. This leaves significant gaps in understanding how the tool operates beyond its basic function.

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 extremely concise with a single, clear sentence ('Navigate to a URL') that is front-loaded and wastes no words. It efficiently communicates the core 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 tool's complexity (a navigation action in a browser automation context), lack of annotations, no output schema, and minimal parameter documentation, the description is incomplete. It does not cover behavioral aspects, error handling, or integration with sibling tools, leaving the agent with insufficient information for reliable use.

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 input schema has 1 parameter with 0% description coverage, and the description does not add any semantic details about the 'url' parameter. It does not specify format requirements (e.g., must be a valid HTTP/HTTPS URL), constraints, or examples, failing 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.

Purpose4/5

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 tool's function with a specific verb ('Navigate') and resource ('URL'), making the purpose immediately understandable. However, it does not differentiate this navigation tool from its siblings like 'puppeteer_click' or 'puppeteer_hover', which are also navigation-related actions in a browser context, so it lacks sibling distinction.

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. It does not mention prerequisites (e.g., requiring an active browser session), exclusions, or compare it to sibling tools like 'puppeteer_evaluate' for executing scripts or 'puppeteer_screenshot' for capturing pages, leaving the agent with minimal context for selection.

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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