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

Annotations are empty, so the description carries the full burden. It only says 'get one visible phone run' without disclosing return format, handling of missing run IDs, or the meaning of 'visible'. No side effects or safety notes are provided, and there is no contradiction with annotations (which are empty).

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, clear sentence with no wasted words and is front-loaded with the core action. It conveys the essential information efficiently, earning a high score.

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 retrieve-by-id tool with two parameters and no output schema, the description is functionally adequate. However, it omits context around the 'visible' qualifier and error behavior, which could matter when the agent invokes it. Given the low complexity, a mid-range score is fair.

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% with descriptions for both slot and run_id. The description adds no extra semantic context beyond what the schema provides (e.g., it doesn't explain that slot refers to a phone from list-phones, which the schema already does). Baseline 3 is appropriate.

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 ('Get') and resource ('visible phone run') with a clear scope ('one' and 'by its run id'). It differentiates from list-phone-runs-tool which would list multiple runs, so an agent can easily distinguish this from siblings.

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?

No guidance on when to use this tool versus alternatives like list-phone-runs-tool. The description does not mention any prerequisites or conditions for selection, leaving the agent to infer that this is for a specific known run ID.

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