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browser_switch_to_default_content

Return to the main browser window from frames or iframes during web automation with Selenium WebDriver.

Instructions

Switches to the default content

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • The inline handler function registered for the 'browser_switch_to_default_content' tool. It retrieves the WebDriver from stateManager, instantiates ElementService, calls switchToDefaultContent(), and returns a success or error message in MCP content format.
    server.tool('browser_switch_to_default_content', 'Switches to the default content', async () => {
      try {
        const driver = stateManager.getDriver();
        const elementService = new ElementService(driver);
        await elementService.switchToDefaultContent();
        return {
          content: [{ type: 'text', text: 'Switched to default content' }],
        };
      } catch (e) {
        return {
          content: [
            {
              type: 'text',
              text: `Error switching to default content: ${(e as Error).message}`,
            },
          ],
        };
      }
    });
  • The core helper method in ElementService class that executes the browser switch to default content using Selenium WebDriver's switchTo().defaultContent().
    async switchToDefaultContent(): Promise<void> {
      await this.driver.switchTo().defaultContent();
    }
  • Registration of the 'browser_switch_to_default_content' tool using server.tool() with description and inline handler function.
    server.tool('browser_switch_to_default_content', 'Switches to the default content', async () => {
      try {
        const driver = stateManager.getDriver();
        const elementService = new ElementService(driver);
        await elementService.switchToDefaultContent();
        return {
          content: [{ type: 'text', text: 'Switched to default content' }],
        };
      } catch (e) {
        return {
          content: [
            {
              type: 'text',
              text: `Error switching to default content: ${(e as Error).message}`,
            },
          ],
        };
      }
    });
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 ('Switches to the default content') but does not explain what this entails behaviorally—e.g., whether it affects browser state, requires specific conditions, or has side effects. For a tool with zero annotation coverage, this minimal description is inadequate, leaving the agent with insufficient context to understand the tool's behavior.

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, concise sentence with no wasted words. It is front-loaded and efficiently states the tool's action without unnecessary elaboration. For a simple tool with no parameters, this level of conciseness is ideal and earns full marks.

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 browser automation and the lack of annotations and output schema, the description is incomplete. It does not explain what 'default content' means, how it differs from other switch tools, or what the expected outcome is. For a tool in a context-rich domain with many siblings, this minimal description fails to provide sufficient context for an AI agent to use it correctly.

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?

The tool has 0 parameters, and the input schema has 100% description coverage (though empty). The description does not need to add parameter semantics, as there are none to document. A baseline score of 4 is appropriate for a parameterless tool, as the description cannot compensate for non-existent parameters, but it does not add value beyond the schema.

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

Purpose2/5

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

The description 'Switches to the default content' is a tautology that essentially restates the tool name 'browser_switch_to_default_content'. It does not specify what 'default content' means in the context of browser automation (e.g., switching from frames/iframes back to the main page), nor does it distinguish this from sibling tools like 'browser_switch_to_frame' or 'browser_switch_to_parent_frame'. The purpose is vague and lacks specificity.

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

Usage Guidelines1/5

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 any context, prerequisites, or exclusions, such as when switching from frames or windows. Given the presence of sibling tools like 'browser_switch_to_frame', this lack of differentiation is a significant gap, making it misleading for an AI agent to select the correct tool.

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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