get_sleep

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions 'Get sleep statistics' which implies a read-only operation, but doesn't address permissions, rate limits, error conditions, or response format. For a tool with zero annotation coverage, this is a significant gap in transparency.

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 and front-loaded, stating the core purpose in the first clause. The second sentence adds optional filtering information. Both sentences earn their place, though it could be slightly more structured (e.g., by explicitly noting parameters are optional).

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?

Given the lack of annotations and output schema, the description is incomplete. It doesn't explain what 'sleep statistics' includes beyond 'average duration and total nights tracked,' nor does it cover behavioral aspects like permissions or error handling. For a tool with no structured metadata, this leaves significant gaps for an agent.

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?

The description adds minimal value beyond the input schema, which has 100% coverage. It mentions 'Optionally filter by date range,' aligning with the two parameters (start_date, end_date) but doesn't provide additional context like default behavior or date format details. With high schema coverage, the baseline score of 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 clearly states the tool's purpose: 'Get sleep statistics including average duration and total nights tracked.' It specifies the verb ('Get') and resource ('sleep statistics') with concrete metrics. However, it doesn't explicitly differentiate from sibling tools like 'get_health_summary' which might also include sleep data, preventing a perfect score.

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 minimal guidance: 'Optionally filter by date range.' It doesn't specify when to use this tool versus alternatives like 'get_health_summary' or other sibling tools, nor does it mention prerequisites or exclusions. This leaves the agent with little context for tool selection.

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