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Playwright Browser MCP Server

by DailyNoBug

Generate Page Object

browser.generate_page_object

Generate a Page Object class from the current browser page, capturing element selectors and actions to simplify test automation.

Instructions

Generate a page object class from current page.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
sessionIdYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
codeYes
languageYes
Behavior2/5

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

No annotations are present, and the description does not disclose side effects, whether it modifies the browser state, or the nature of the generated class beyond a name. 'From current page' implies reading but lacks explicit behavioral details.

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?

A single, front-loaded sentence with no unnecessary words. It is appropriately concise for a tool with one parameter.

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?

Even with an output schema, the description lacks usage context, parameter semantics, and behavioral disclosure. As a result, the agent has insufficient information to confidently select and correctly invoke this tool.

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 only parameter, sessionId, has no schema description, and the description does not mention it. With 0% schema coverage, the description should compensate but does not, leaving the parameter's role implicit.

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

Purpose5/5

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

The description uses a specific verb 'Generate' and identifies the resource 'page object class' from 'current page', clearly distinguishing it from sibling tools like generate_playwright_script and generate_data_schema.

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 is provided on when to use this tool versus alternatives, prerequisites, or typical scenarios. The description only states what it does, not when to choose it over siblings.

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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