launch_app_sim

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

No annotations are provided, so the description carries the full burden. It discloses one important behavior: runtime logs are captured automatically and the log file path is included in the response. However, it does not mention prerequisites (e.g., a booted simulator), whether the app is terminated first, or any side effects. Some useful context is added, but significant gaps remain.

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 two short sentences, with the main action front-loaded and the logging behavior added succinctly. 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?

The tool has two optional parameters, no output schema, and no annotations. The description covers the core action and a key return detail (log path), but it omits usage context (when to launch vs. build_run_sim) and prerequisites (like simulator state). For a simple launch tool, it is partially complete but leaves clear gaps.

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% and both parameters (env and launchArgs) have descriptive text, including the SIMCTL_CHILD_ prefix note for env. The description itself adds no parameter-specific information, so the schema does the heavy lifting, meeting the baseline for high coverage.

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 launches an app on a simulator, which is a specific verb+resource. It distinguishes itself from sibling tools like build_run_sim (which builds and runs) and open_sim (which opens the simulator) by focusing solely on launching an app. The second sentence about log capture adds a useful distinguishing feature.

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 no guidance on when to use this tool versus alternatives. It does not mention that it should be used after building an app, or that build_run_sim could be used to build and launch in one step. No exclusions or alternative tool references are given.

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