calendars_create_block_slot

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

The description adds no behavioral information beyond what annotations already convey (readOnlyHint=false implies a write operation). It does not disclose side effects, required permissions, or the outcome of the operation, and the openWorldHint annotation is left unexplained. With annotations present, the bar is lower, but the description still contributes nothing.

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?

While the description is extremely short, it is under-specified rather than concise. A single phrase that restates the title provides no value and fails to front-load any useful information. The brevity is not an asset; it is a deficiency given the tool's complexity.

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 tool with six parameters and no output schema, the description should explain what a block slot is, how start/end times are formatted, and what the response looks like. None of this is present. The description is completely inadequate for an agent to call the tool correctly and understand its effects.

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 input schema provides descriptions for all six parameters, including the mutual exclusivity of calendarId and assignedUserId. Since schema description coverage is 100%, the baseline is 3 even though the description itself adds no parameter context. The schema independently documents the parameters sufficiently.

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 'Create Block Slot' essentially restates the tool name with no additional context. It does not explain what a block slot is in the calendar context, nor does it differentiate this from other calendar creation tools like calendars_create_appointment or calendars_create_calendar. An agent cannot determine the specific purpose based on this text alone.

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?

No guidance is provided on when to use this tool versus alternatives. There is no mention of conditions, prerequisites, or exclusions. The description gives no indication of the scenarios where creating a block slot would be appropriate.

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