tabs_create

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

No annotations exist, so the description must carry the burden. It does disclose the meaningful side effect ('make it active'), which tells the agent focus changes, but says nothing about whether a browser-automation permission prompt occurs, what is returned (tab handle/id), or what happens on an invalid URL.

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?

One short sentence with the core action front-loaded and the optional-parameter note in parentheses; nothing is wasted.

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 one-parameter, non-annotated mutation tool this covers the essentials, but with no output schema the description never says what a caller gets back (a tab identifier is critical for chaining tabs_select/tabs_close), leaving a real gap.

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 compensate for the single parameter. It conveys that url is optional and is the initial page to load, but adds no format hints (scheme requirements, defaults such as blank tab) beyond the property name.

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?

States a specific verb+resource ('Open a new Safari tab') plus the side effect of activation, so it is clearly distinct from tabs_list/tabs_close in spirit. It does not explicitly distinguish itself from 'navigate' (which presumably loads a URL in the existing tab), leaving that differentiation to inference.

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 parenthetical '(optionally at a URL)' implies when the url parameter is worth passing, but there is no explicit guidance on when to create a tab versus reusing one with tabs_select or navigate.

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