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 what the tool does (list tabs with URLs and titles) but does not mention behavioral traits such as whether it requires an active browser session, potential performance impacts, or how it handles errors. This leaves gaps in understanding operational context.

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, efficient sentence that front-loads the core action ('List all open tabs') and adds necessary detail ('with their URLs and titles') without any waste. It is appropriately sized for a simple tool with no parameters, making it easy to parse 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 (0 parameters, no annotations), the description is complete enough for basic understanding. It specifies what is listed (tabs, URLs, titles), and since an output schema exists, it need not explain return values. However, it lacks context on prerequisites like an active browser session, which could be helpful.

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 0 parameters, and schema description coverage is 100%, so no parameter information is needed. The description does not add parameter details beyond the schema, but this is appropriate as there are no parameters to document. Baseline is 4 for zero parameters, as it avoids unnecessary complexity.

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 specific action ('List all open tabs') and the resources returned ('with their URLs and titles'), distinguishing it from siblings like browser_switch_tab or browser_close_tab that manipulate tabs rather than list them. It uses precise verbs and specifies the scope (all open tabs), making the purpose unambiguous.

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 implies usage by stating 'List all open tabs,' suggesting it should be used when needing to enumerate tabs, but it does not explicitly mention when to use this tool versus alternatives like browser_status or browser_switch_tab. No exclusions or prerequisites are provided, leaving some ambiguity in context.

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