Connect Withings account

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

The description discloses the behavioral flow: it returns an authorization URL, requires user interaction in a browser, and establishes a persistent connection until disconnect/expiry. This adds depth beyond the annotations, which only hint at state-changing and external side effects. It does not explain the behavior if already connected, but that is a minor gap.

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 three concise sentences that are front-loaded with the primary action and then provide necessary steps and persistence context. Every sentence contributes relevant information with no redundancy or filler.

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 zero-parameter tool with no output schema, the description is complete: it explains the purpose, the returned artifact, the required user action, the effect on downstream tools, and the conditions for reuse. It fully covers the context an agent needs to invoke and understand the tool 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 has zero parameters, so the description does not need to explain parameter semantics. The schema fully covers parameters (100% coverage) and there is nothing to add. Baseline 4 is appropriate for a parameterless tool.

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 'Start linking YOUR Withings account' with an explicit verb and resource, and explains the OAuth flow. It distinguishes this tool from sibling data-retrieval tools and withings_disconnect by positioning it as the prerequisite setup step.

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 gives explicit guidance on when to use it: 'Needed once (and again only if you disconnect or the link expires).' It also implies 'use before data tools work,' but does not explicitly name any alternative tools. This is clear context with no exclusion, but lacks an explicit alternative comparison.

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