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

With no annotations provided, the description bears full responsibility for behavioral disclosure. It does not explain side effects, required permissions, error handling, or what happens upon execution (e.g., whether it waits for the app to launch). This is a significant gap for a tool with 31 parameters.

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, front-loaded sentence that efficiently states the tool's core action. However, it may be overly terse, omitting context that could be useful for an agent.

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?

Considering the tool's complexity (31 parameters, no output schema, no annotations), the description is incomplete. It lacks information on return values, error conditions, and device resolution behavior, which are critical for correct invocation.

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?

Given high schema description coverage (94%), the schema itself already documents most parameters. The description adds no extra meaning beyond what the schema provides, meeting the baseline for this dimension.

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 opens an app, deep link, URL, or platform surface. It provides a specific verb and resource, but does not distinguish it from sibling tools like 'click' or 'type', as it is fairly unique in purpose. The brevity is acceptable but lacks detail on what 'platform surface' encompasses.

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 offers no guidance on when to use this tool versus alternatives, nor any conditions for use. There is no mention of prerequisites, such as whether the app must be installed, or scenarios where this tool is inappropriate.

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