sim_open_url

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does not mention whether the simulator must already be booted, whether the URL is opened in the default browser or a specific app, whether the command waits for the page to load, or what happens on failure. The description only states the action without behavioral context.

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 description is a single concise sentence that front-loads the core action and URL type. It earns its place, though it could add a brief usage note without becoming bloated.

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?

The tool has five parameters, no annotations, and an output schema, but the description does not explain the connection/authentication parameters (host, user, key_path) or the simulator selection parameter (udid). An agent cannot confidently call this tool correctly without inspecting the schema and guessing at parameter semantics. The output schema exists but the input side is under-specified.

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%, so the description must compensate for the five parameters. It does not explain what 'host', 'user', 'key_path', or 'udid' mean, nor how they relate to opening a URL. The only parameter it implicitly clarifies is 'url'. This is a significant gap for a tool with three required parameters.

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 ('Open') and resource ('a URL in the simulator'), and clarifies it covers deep links or web URLs. It is clear enough to distinguish from sibling tools like sim_launch (which launches an app) and sim_install (which installs an app), though it does not explicitly name those alternatives.

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 usage: use this tool when you need to open a URL inside a simulator. It does not explicitly state when not to use it or name alternatives such as sim_launch for launching an app by bundle ID. The context is clear but the guidance is minimal.

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