Open application

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

With no annotations, the description carries the full burden. It does disclose a useful behavioral trait: unknown values are attempted as literal .exe names. However, it does not say what happens on failure, whether launching is asynchronous, or whether target arguments apply to all apps.

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 front-loaded with the core action and then gives a practical vocabulary list plus fallback rule. Every sentence earns its place, and the length is justified by the useful enumeration.

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?

For a simple two-parameter launch tool with no output schema, the description plus the input schema covers what an agent needs to invoke it correctly. Minor omissions like error behavior and target applicability prevent a perfect score.

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 already describes both parameters, so the baseline is 3. The description adds genuine value by enumerating accepted friendly names and clarifying the fallback behavior for the app parameter, which helps an agent pick valid inputs.

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 uses a specific verb and resource ('Launch an application') and clearly distinguishes itself from path-opening siblings like open_path and open_path_with by defining its input as application names or .exe values. The known-name list tightens the scope further.

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 when to use the tool: to launch applications by friendly name or .exe. However, it does not explicitly mention when to prefer alternatives like open_path or open_path_with, nor does it state exclusions, so usage guidance remains implicit rather than explicit.

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