stagehand_navigate

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

No annotations are provided, so the description must carry the full burden. It adds the useful localhost tunneling behavior, but does not disclose what happens after navigation (e.g., waits, error handling, return value). For a simple navigate tool this is acceptable, but there are gaps in behavioral disclosure.

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 concise sentences that immediately state the purpose, then add usage constraints and a special-case note. No wasted words; every sentence earns its place.

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?

Given the tool's simplicity (one parameter, no output schema), the description covers the core use case, guidance on safe URLs, and the localhost tunneling detail. However, it omits behavior on page load failure or waiting, which would be useful but is not critical for such a basic operation.

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 100% coverage for the single 'url' parameter with a basic description. The tool description goes beyond the schema by adding practical constraints (URLs must be confirmed working) and special support for localhost URLs. This enriches the parameter semantics beyond the schema alone.

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 starts with 'Navigate to a URL in the browser', which is a specific verb and resource. It clearly differentiates from siblings like stagehand_get_url (which reads the current URL) and stagehand_act (which performs actions). The purpose is unambiguous.

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 description gives explicit when-to-use guidance: only use with URLs you are confident will work, otherwise fall back to https://google.com. It also mentions support for localhost URLs with automatic ngrok tunneling, providing a clear alternative and prerequisite context.

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