Get Eight Sleep Sleep Trends

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

Annotations already declare the tool as read-only, idempotent, and non-destructive. The description adds the context of returning data for a date range, but does not disclose any additional behavioral traits such as data freshness, pagination, or rate limits. With annotations covering safety, the bar is lower, and the description provides minimal extra value.

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, short sentence that is front-loaded with the verb and resource. It contains no filler or repetitive information, making it highly concise.

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 tool has 6 parameters (2 required) and an output schema, the one-sentence description is insufficient. It does not explain how parameters like user_id, timezone, or response_format affect the output, nor does it mention that it can return data in different formats. The description is not complete enough for an agent to understand the full scope of the tool.

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 description coverage is 50% (3 of 6 parameters have descriptions), but the tool description does not add meaning beyond 'for a date range'. It does not explain optional parameters like user_id, timezone, response_format, or privacy_mode, leaving significant gaps for the agent.

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?

Description states it returns nightly sleep sessions and scores for a date range, which is clear and specific. However, it does not differentiate from similar sibling tools like eight_sleep_nightly_summary or eight_sleep_efficiency, so it loses a point for lacking sibling distinction.

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 is provided on when to use this tool versus alternatives. The description merely states what it does, with no when-to-use or when-not-to-use advice, leaving the agent to infer context.

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