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Wladastic

AutoProbeMCP

by Wladastic

get_element_text

Retrieve the visible text content of a web page element using its CSS selector. Specify a timeout for waiting if the element is not immediately present.

Instructions

Get text content of an element

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
selectorYesCSS selector for the element
timeoutNoTimeout in milliseconds

Implementation Reference

  • Zod schema for get_element_text input validation, defining 'selector' (string, required) and 'timeout' (number, default 5000ms).
    const GetElementTextSchema = z.object({
      selector: z.string(),
      timeout: z.number().default(5000)
    });
  • src/index.ts:237-255 (registration)
    Registration of the 'get_element_text' tool in the ListTools handler, specifying name, description, and inputSchema.
    {
      name: 'get_element_text',
      description: 'Get text content of an element',
      inputSchema: {
        type: 'object',
        properties: {
          selector: {
            type: 'string',
            description: 'CSS selector for the element'
          },
          timeout: {
            type: 'number',
            default: 5000,
            description: 'Timeout in milliseconds'
          }
        },
        required: ['selector']
      }
    },
  • Handler case for 'get_element_text': validates input via GetElementTextSchema, calls currentPage.textContent() with the selector and timeout, and returns the element's text content.
    case 'get_element_text': {
      if (!currentPage) {
        throw new Error('No browser page available. Launch a browser first.');
      }
    
      const params = GetElementTextSchema.parse(args);
      const text = await currentPage.textContent(params.selector, { timeout: params.timeout });
    
      return {
        content: [
          {
            type: 'text',
            text: `Element text: ${text || '(empty)'}`
          }
        ]
      };
    }
Behavior2/5

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

No annotations provided, and the description does not disclose behavioral details such as whether hidden elements return text, if the tool waits for the element, or error handling when the element is not found. The timeout parameter implies waiting but is not mentioned in the description.

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, clear sentence with no extraneous words, making it highly concise.

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 retrieval tool, the description is adequate but lacks details about return value format and behavior with multiple matches. Given no output schema, more information about what is returned would improve completeness.

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 input schema fully describes both parameters (selector as CSS selector, timeout as milliseconds). Since schema coverage is 100%, the description adds no extra semantic meaning beyond the schema, meeting the baseline.

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 clearly states the tool retrieves text content from an element, which is a specific verb+resource pair. However, it does not differentiate from siblings like evaluate_javascript that could also retrieve text, and it doesn't specify whether it returns text for the first match or all matches.

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?

No guidance on when to use this tool versus alternatives (e.g., evaluate_javascript, get_page_info), nor any prerequisites or context for when it's appropriate.

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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