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

The annotations already declare readOnlyHint=false, openWorldHint=true, destructiveHint=false, so the external/stateful nature is partly covered. The description usefully adds that the tool produces a human-in-the-loop link rather than completing the connection itself, which is real added context. It does not say whether the connection persists, whether links expire, or what the agent should do with the link once returned.

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?

One short sentence with no filler, and the outcome is front-loaded before the purpose clause. The phrasing 'your person' is idiosyncratic vocabulary that costs a little clarity, but nothing is redundant.

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 parameters and no output schema, the description carries the burden of explaining what comes back and how to use it. It hints that a link is returned but never states that the agent should surface it to the user, nor what state the connection is in afterward. For a simple one-step auth tool this is adequate but leaves a gap at the exact point the agent must act.

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 and the baseline of 4 applies. No misleading parameter claims are made.

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 the concrete outcome: a link that the user opens to approve Google Calendar access, which then lets the agent offer times and book. That is specific enough to distinguish it from siblings like who_can_reach_me or errand. It falls short of a crisp verb-first statement (it never says 'returns/creates a link') and the subject 'your person' is house jargon an outside agent may not parse.

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 implied by the payoff clause ('so the agent can offer times and book'), which suggests calling this when calendar access is needed for scheduling. There is no explicit trigger condition, no statement of prerequisites (e.g., calendar not yet connected), and no guidance on what to do after the link is issued or what to use instead if the user declines.

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