BrowserCat MCP Server

browsercat_navigate

Navigate to a specified URL using a cloud browser service to automate web browsing tasks without local installation.

Instructions

Navigate to a URL

Input Schema

TableJSON Schema

Name	Required	Description	Default
`url`	Yes

Implementation Reference

index.ts:171-179 (handler)

Executes the browsercat_navigate tool by navigating the Puppeteer page to the provided URL and returning a success text message.

case "browsercat_navigate":
  await page.goto(args.url);
  return {
    content: [{
      type: "text",
      text: `Navigated to ${args.url}`,
    }],
    isError: false,
  };

index.ts:29-39 (schema)

Defines the tool schema for browsercat_navigate, including name, description, and input schema requiring a 'url' string property.

{
  name: "browsercat_navigate",
  description: "Navigate to a URL",
  inputSchema: {
    type: "object",
    properties: {
      url: { type: "string" },
    },
    required: ["url"],
  },
},

index.ts:421-423 (registration)
Registers the list of available tools, including browsercat_navigate, for the ListToolsRequestSchema.
```
server.setRequestHandler(ListToolsRequestSchema, async () => ({
  tools: TOOLS,
}));
```
index.ts:425-427 (registration)
Registers the general tool call handler that dispatches to specific tool implementations based on the tool name.
```
server.setRequestHandler(CallToolRequestSchema, async (request) =>
  handleToolCall(request.params.name, request.params.arguments ?? {})
);
```

Schema Changelog

Changes observed during successful MCP inspections.

First observedNov 17, 2025

TDQS

B3.1/5.0

Behavior2/5

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

With no annotations provided, the description bears full responsibility for behavioral disclosure. It only states the action without specifying side effects, return values, or whether navigation waits for page load. This is minimal transparency for a state-changing operation.

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 redundancy. Every word is necessary and contributes to the core purpose, achieving ideal conciseness.

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

Completeness3/5

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

For a simple navigation tool with one parameter and no output schema, the description is minimal but adequate. However, it omits key context such as whether the tool returns a status, waits for page load, or handles errors, which an AI agent might need for robust usage.

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

Parameters3/5

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

The description adds basic meaning to the 'url' parameter by implying it is the destination URL. However, with 0% schema description coverage, it does not provide constraints (e.g., format, allowed protocols) or clarify whether relative URLs are accepted. This adds partial value but not comprehensive detail.

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 action and resource, distinguishing it from sibling tools like browsercat_click or browsercat_fill. However, it does not explicitly differentiate its usage from alternatives.

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 other sibling tools, nor does it mention prerequisites or context for navigation. This lack of usage instructions limits the agent's ability to select the correct tool efficiently.

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

Deploy Server