apple_safari_open_tab

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

Annotations already declare openWorldHint=true and readOnlyHint=false, so the network-touching, non-read-only nature is known from structured data; 'can contact a remote website' largely restates openWorldHint. The description omits genuinely additive behavior such as whether the tab is focused/foregrounded, whether duplicate tabs are created, and what is returned.

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?

Two short sentences, front-loaded with the action and scope. The second sentence is largely redundant with the openWorld annotation, but the overall size is appropriate and there is no padding.

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 3-parameter mutation-ish tool with no output schema and no annotation coverage of return/UI effects, the description should explain activate/windowId behavior and what happens on invocation. As written, an agent cannot call it confidently beyond the required URL.

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 0%, so the description must carry parameter meaning, and it only covers the required 'url' (adding the HTTP(S) restriction, which the generic uri format does not convey). The 'activate' and 'windowId' parameters are explained nowhere, leaving two of three params opaque.

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 states a specific verb and resource ('Open an HTTP(S) URL in a new Safari tab') and the 'new tab' qualifier separates it from apple_safari_navigate_tab and apple_safari_close_tab. It stops short of naming those siblings explicitly, so an agent still has to infer the split between 'open new' and 'navigate existing'.

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?

'In a new Safari tab' implies the usage context versus navigating an existing tab, but there is no explicit when-to-use/when-not statement or reference to the sibling tools. An agent can guess the intent but is given no routing rule.

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