Playwright Browserbase MCP Server

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively explains that the tool extracts based on instructions and a schema, works best with clear instructions, and ensures structured output. However, it lacks details on potential limitations, error handling, or performance aspects like rate limits or timeouts.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is appropriately sized and front-loaded, starting with the core purpose. Each sentence adds value, such as usage guidelines and best practices. However, it could be slightly more concise by avoiding minor repetition (e.g., 'extract' mentioned multiple times).

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

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

Given the tool's complexity (extraction from web pages) and lack of annotations or output schema, the description does a good job covering purpose, usage, and behavioral aspects. It provides practical advice on instructions and schema use. However, it could benefit from mentioning output format or error cases to be fully complete.

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

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

The input schema has 100% description coverage, with the 'instruction' parameter well-documented in the schema itself. The description adds minimal value beyond the schema by emphasizing the need for clear, specific instructions, but doesn't provide additional syntax or format details. This meets the baseline for high schema coverage.

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

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

The description clearly states the tool's purpose with specific verbs ('extracts structured information and text content') and resources ('from the current web page'), distinguishing it from sibling tools like 'observe' for interactive elements. It explicitly mentions scraping data, gathering information, and pulling content, providing a comprehensive understanding of its function.

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

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides explicit guidance on when to use this tool ('when you need to get text content, data, or information from a page') and when not to ('For interactive elements like buttons, forms, or clickable items, use the observe tool instead'). It clearly names the alternative tool ('observe'), offering precise usage context.

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