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

Beyond the annotations, it discloses important behavior: this is a real Chrome where the user is signed in, the URL reuses the site's open tab when possible so the user's tabs stay intact, and the page contents are returned afterward. These details materially affect how an agent should reason about side effects and subsequent steps.

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 definition is front-loaded and generally tight, with the key sequencing instruction in the second sentence. The final PatientNow action list is useful but slightly tangential, and the phrase 'with the same numbers' is terse enough to be mildly ambiguous.

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?

With no output schema, the description appropriately explains what comes back: the elements and text in view after the page opens. It does not fully cover the app parameter's conditional use, but that is documented in the schema, so the definition is complete enough for an agent to call it correctly.

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 coverage is 100%, so parameter documentation is already handled by the schema. The description adds some useful URL-routing meaning by explaining that the URL goes to the site's open tab or a new tab, but it does not reinforce the conditional meaning of the app parameter.

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: it starts the user's Cloud Browser and opens a URL. 'Call it first' and the tab-behavior sentence distinguish it from follow-up browser actions such as click, fill, or read.

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?

It gives clear sequencing guidance with 'Call it first' and explains the PatientNow actions it supports. It does not explicitly state when not to use it, such as when the browser is already open and navigate should be used instead.

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