open

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

No annotations are provided, so the description carries the behavioral burden, and it does disclose the non-obvious automatic Cloudflare challenge solving plus the `--no-auto-solve` exception. It also explains that `challenge` reports `kind`, `solved`, and `remaining`, though it omits timeout, error, and session/cookie effects.

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 two sentences, front-loaded with the navigation action and return shape, then adding the Cloudflare caveat. The parenthetical detail is purposeful and does not obscure the core operation.

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 return values need not be fully explained, and the description adds important context about challenge handling. It is mostly complete for a one-parameter navigation tool, though explicit sibling usage guidance is still 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?

The only parameter is `url`, and schema description coverage is 0%, so the description must compensate for the missing documentation. It repeats `url` in context but adds no format details, validation rules, or absolute/relative URL semantics.

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: navigate the stealth browser to `url`, and it identifies the returned `{url, title}`. It does not explicitly distinguish this from sibling tools such as `solve_challenge`, `challenge_state`, or `read_html`, so it falls short of a 5.

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 implies this is the navigation tool and notes automatic Cloudflare challenge solving unless `--no-auto-solve` is set. However, it does not say when to choose `open` versus siblings like `solve_challenge`, `challenge_state`, or `read_text`, leaving usage largely inferred.

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