Open URL In Safari

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

Annotations already indicate openWorldHint=true and readOnlyHint=false, which cover the side-effecting nature. The description adds a small detail about new tab/window behavior, but it does not elaborate on permissions, error handling, or effects on existing tabs. This is adequate but not rich.

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 short, front-loaded sentence that conveys the essential action without any waste. It is concise and easy to parse.

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?

For a simple two-parameter tool with no output schema and good annotation coverage, the description is sufficient. It communicates the core action and the optional new-window behavior. However, it does not specify edge cases like invalid URLs or whether Safari is brought to foreground, which would have made it 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?

Schema description coverage is 100% for both parameters (url and inNewWindow), so the schema already documents them. The description does not add any parameter-level semantics beyond what the schema provides, hence the baseline score of 3.

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 verb 'Opens a URL in Safari' and specifies the resource (Safari) and the action (new tab or new window). It distinguishes from sibling tools like list-safari-tabs, close-safari-tab, and get-current-safari-url by focusing on the opening action.

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 when a URL needs to be opened in Safari, but it does not explicitly mention when to use this tool versus alternatives like list-safari-tabs or get-current-safari-url. There are no exclusions or prerequisite conditions stated.

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