withings_get_devices

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

With no annotations, the description carries the full behavioral burden. It does add real value by disclosing 'Always fetched live from the Withings API', signalling no caching and potential latency/freshness implications, but it omits auth/permission requirements and error behavior for a tool that must hit an external API.

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?

Three short, front-loaded sentences with no filler; the core purpose leads and details follow. A small inconsistency: it advertises 'firmware info' but the enumerated return fields include no firmware version, so that phrase is slightly wasted.

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?

With no output schema, the description usefully documents the return fields, which is exactly what the agent needs. For a zero-parameter read tool the only real gap is the absence of auth/permission context, otherwise it is complete enough to call correctly.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; the 4 baseline applies. The return-field enumeration is extra but belongs to output rather than parameter semantics.

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?

States a specific verb ('Get') and a distinct resource ('connected Withings devices') and enumerates what is returned (type, model, battery, last session). This clearly separates it from the data-fetching siblings (activity, workouts, body, heart, sleep), though it never names those siblings explicitly.

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?

Usage is only implied: an agent can infer it should call this when it needs device connection status, battery, or firmware. There is no explicit when-to-use guidance, no mention of prerequisites (e.g., an active Withings account/OAuth), and no routing to or from sibling tools.

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