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

Annotations already establish readOnlyHint=true and non-destructive, so safety is covered. The description adds meaningful context beyond that: it discloses the two distinct facts returned (connection state and write capability) and the security-relevant guarantee that a token is never returned. Only the exact field shape/pagination-style behavior is absent, which the output schema covers.

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?

A single front-loaded sentence with no filler; every clause (connection state, write permission, no token) carries information an agent needs.

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, read-only status probe with a full output schema, the description supplies everything an agent needs to decide to call it and what it can rely on, including the no-token guarantee. Nothing material is missing.

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 the baseline is 4; there is nothing for the description to disambiguate. It correctly adds no parameter chatter.

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 precisely what the tool reports: whether Daash is connected to the user's Garmin account via the official API, and whether write access to workouts is granted. No sibling tool covers connection state, so differentiation is implicit and unambiguous. It phrases the purpose as a set of returned facts rather than a verb, which is slightly indirect but still clear.

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?

There is no explicit 'call this before scheduling a workout' or any when/when-not guidance. The context (a write-permission flag) implies it is a prerequisite check for create_workout/schedule_workout, but the agent must infer that. No alternatives are named, though none exist among the siblings.

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