pt_open_url

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

With no annotations, the description carries the full burden of explaining behavior. It discloses that the action occurs on the simulator and gives examples of web pages and deep links, but it does not mention side effects like whether it brings an app to foreground, what happens if the scheme is not handled, or if it clears current state. The behavior is largely predictable, but additional transparency would be beneficial.

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 concise, two sentences, and front-loaded with the action. The example is relevant and adds value without unnecessary length. Every sentence contributes to understanding the tool's purpose and usage.

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 is simple with a clear schema and no output schema, so the description adequately covers the main use cases. It explains web pages and deep links, which is sufficient for an agent to select and invoke it correctly. However, it does not mention edge cases like URL encoding or the need for apps to register the scheme, which could be considered a minor gap.

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 coverage is 100% for both parameters, so the baseline is 3. The description adds meaningful context for the 'url' parameter by illustrating deep link format ('myapp://screen/profile'), which helps the agent understand expected input semantics beyond the schema's simple 'The URL or deep link to open'.

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 clearly states the tool's function with a specific verb and resource: 'Open a URL or deep link on the simulator.' It distinguishes itself from siblings like pt_launch_app by explicitly mentioning deep links into apps and web pages in Safari, using a concrete example.

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 provides clear context on when to use this tool: for opening web pages in Safari or triggering deep links. It implies the alternative (launching apps directly via bundle ID would use pt_launch_app) but does not explicitly name alternatives or state when not to use it, leaving a slight gap.

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