browser_open

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

With no annotations, the description carries the burden and does well: it discloses return contents, the popup branch, and the caveat that a preview may show an interstitial instead of the requested page. It omits failure modes such as unreachable URLs, timeouts, or auth-walled pages, which matter for a navigation call.

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?

Three tight sentences, front-loaded with the action and result, with no filler. Slightly telegraphic in the popup clause, but every sentence carries actionable information.

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?

An output schema exists, so the return-value prose is a bonus rather than a necessity, and the description adds the non-obvious parts: readiness flag semantics, input labels for smart_type, and the interstitial risk. Only the error/edge-case behavior is missing.

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% and the single 'url' parameter is undocumented in both schema and description — no guidance on absolute vs relative URLs or scheme requirements. The parameter is largely self-evident from its name, so this is a real but modest gap rather than a blocking one.

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 URL') and immediately characterizes the payload (title, readiness, input labels, short page preview), so an agent knows both the action and the observable result. It is clearly the navigation entry point among click/type/scroll siblings.

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?

Explicitly routes downstream: use handle_popup to inspect/resolve a popup, skip wait_until_ready when ready is true, and pass the returned field label into smart_type. Each condition names the sibling alternative and the trigger for using it.

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