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

Beyond the annotations, the description discloses substantial behavior: the page is hidden/staging, it waits for load and settle, it answers in about 45 seconds, still-loading pages return a specific message, error statuses are named, only a few recent pages stay loaded, unused pages are unloaded and reopened, and private sites are refused. This is unusually rich context for an openWorld read operation.

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 paragraph is dense and long, but it is front-loaded with the core purpose and follows with usage, behavior, and the detailed Candidate-tree output format. Much of the length is justified because there is no output schema, though the mini-format spec could be easier to scan as structured text.

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 and a single input parameter, the description carries the full burden and does so thoroughly: it explains the return value (page id and Candidate lines), the line format, loading and error status reporting, the 45-second timeout behavior, and page-lifecycle memory behavior. An agent has enough information to call and interpret the tool.

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 schema has only one parameter with zero description coverage, so the description must compensate. It says the tool opens a URL, which is minimal but sufficient given the schema's format: uri constraint; however, it provides no further semantics about acceptable URL forms, schemes, or relative paths beyond refusing Private sites.

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 a URL as a hidden Staging page with the user's profile.' It also distinguishes the tool from its siblings by explaining that it is for pages you may take Panels from or that your own tools can't read, and that Banquish has no search so you must find pages yourself.

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 usage conditions: use it to obtain a page you can take Panels from or one your tools can't read properly, find URLs with your own search, and use expand/find afterward. It also states a when-not condition ('Pages on the user's Private sites are refused'), but does not compare against all relevant siblings such as screenshot or reveal.

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