List User Busy Times

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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true, and destructiveHint=false, so the safety profile is fully covered. The description's only added behavioral fact is the required OAuth scope ("availability:read"), which is genuinely useful auth context, but nothing about pagination, result shape, or failure modes is disclosed. Modest value-add over annotations justifies a 3.

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 verbosity. The only inefficiency is that the opening sentence duplicates the title rather than using that space for scope or usage detail.

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 rich annotations, a fully covered schema, and no output schema, the description need not explain returns, but it still omits any usage context distinguishing it from sibling availability tools. It is minimally adequate for a query endpoint but leaves the selection decision to the agent.

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 description coverage is 100%, and the schema fully documents all four parameters including the start_time/end_time future/past constraints and the account credential selector. The description adds no parameter meaning beyond the schema, so the baseline of 3 applies.

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 first sentence, "List User Busy Times," is a verbatim restatement of the tool's title and adds no information beyond the name. There is no elaboration of scope such as whose busy times, over what period, or how this differs from sibling availability tools like list_availability_schedules or list_event_type_available_times.

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 no indication of when to use this tool versus the numerous availability-related siblings (list_availability_schedules, get_availability_schedule, list_event_type_available_times). No preconditions, exclusions, or alternative-routing cues are provided.

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