Daytona Playwright MCP Server

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 ('Close') but doesn't explain what happens after closure (e.g., if the browser switches to another tab, if data is lost, or if it requires specific permissions). For a mutation tool with zero annotation coverage, this lack of detail about consequences and side effects is a significant gap.

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 ('Close a browser tab.') that is front-loaded and wastes no words. It efficiently conveys the core action without unnecessary elaboration, making it easy for an agent to parse and understand quickly.

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 low complexity (one optional parameter) and the presence of an output schema (which handles return values), the description is minimally complete. However, it lacks context about behavioral aspects (e.g., what happens post-closure) and usage guidelines, which are important for a mutation tool with no annotations. This makes it adequate but with clear gaps in guidance.

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 'index' parameter well-documented as 'Index of the tab to close (defaults to current tab)'. The description adds no additional meaning beyond this, as it doesn't clarify tab indexing specifics (e.g., zero-based) or edge cases. With high schema coverage, the baseline score of 3 is appropriate, as the schema handles the parameter semantics adequately.

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 ('Close') and resource ('a browser tab'), making the purpose immediately understandable. It distinguishes this tool from siblings like browser_list_tabs or browser_new_tab by focusing on tab closure rather than listing or creating tabs. However, it doesn't explicitly differentiate from browser_stop (which might close the entire browser) or specify if it closes only one tab versus multiple.

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. It doesn't mention prerequisites (e.g., needing an open browser or tab), exclusions (e.g., not for closing windows), or comparisons to siblings like browser_stop or browser_switch_tab. Without such context, an agent might misuse it or overlook better options.

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