Playwright MCP Server

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

With no annotations provided, the description carries full burden for behavioral disclosure. It states what the tool does but omits critical details: whether it requires an active Playwright session, how it handles dynamic content or hidden elements, potential performance implications, or error conditions. For a tool with zero annotation coverage, this leaves significant gaps in understanding its operational behavior.

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 a single, clear sentence that directly states the tool's function without unnecessary words. It is front-loaded with the core action and resource, making it immediately comprehensible. Every word earns its place, and there is no redundancy or fluff.

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 complexity of a browser automation tool with no annotations and no output schema, the description is insufficient. It doesn't explain what 'visible text content' entails (e.g., excludes hidden elements, includes formatted text), the return format, or error handling. For a tool in a rich sibling set like Playwright, more context is needed to ensure correct usage by an AI agent.

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 tool has zero parameters, and the input schema has 100% description coverage (though empty). The description appropriately doesn't discuss parameters since none exist, which is correct. No additional parameter information is needed, so this meets the baseline expectation for parameterless tools.

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 action ('Get') and the resource ('visible text content of the current page'), making the purpose immediately understandable. It doesn't explicitly differentiate from sibling tools like 'playwright_get_visible_html', but the focus on 'text content' vs 'html' provides implicit distinction. The description avoids tautology by specifying what is being retrieved rather than just restating the tool name.

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 no guidance on when to use this tool versus alternatives like 'playwright_get_visible_html' or other text-extraction methods. It lacks context about prerequisites (e.g., requires an active page session) or typical use cases. The agent must infer usage solely from the tool name and description without explicit direction.

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