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

Annotations already declare readOnly, idempotent, non-destructive, non-open-world, so the safety profile is covered. The description still adds value beyond that by disclosing what the response contains and that the call is 'Free' (no cost/billing), a behavioral trait not present in the annotations. It stops short of saying how missing or invalid configuration is handled.

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 resource and its contents are front-loaded in a single dense sentence, followed by a short parameter note and 'Free.' Almost every clause earns its place, though the trailing fragments read telegraphically and 'Free' is ambiguous without context.

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?

There is no output schema, so the description carries the burden of describing the return shape, and it does so by enumerating the exact sections returned and how they differ for the business vs. personal calendar. For a one-parameter read tool with annotations covering safety, this 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?

Schema coverage is 100% and the schema documents the single 'person' parameter, so the baseline would be 3. The description adds real semantics on top: it clarifies that omitting 'person' yields the business calendar and that the parameter scopes to an individual's own calendar, which is the default-vs-override behavior the agent needs.

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?

Specific verb ('Get') plus a detailed enumeration of the resource: settings, booking page, iCal subscribe link, connected Google calendar, confirmation calls, and — for the business calendar — meeting types and people's calendars. It's far more than a restatement of the name. It does not, however, distinguish itself from siblings such as calendar_setup or calendar_list_meeting_types, leaving the agent to infer which one to call.

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?

'person reads someone's own calendar' implies the default is the business calendar and that the parameter switches scope, which is useful usage context. But there is no explicit when-to-use/when-not guidance and no pointer to the alternative tools (calendar_setup for changes, calendar_list_meeting_types). Usage is implied rather than stated.

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