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

The description adds meaningful context beyond annotations by explaining that the calendar is blocked so no one can book it, which helps an agent understand the practical effect. However, with destructiveHint=true and idempotentHint=false, it does not mention irreversibility, overlapping-booking behavior, or what happens on repeated calls, so the added behavioral context is modest.

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?

It is a single front-loaded sentence with no wasted words. The core effect is stated first and the two supported durations are appended efficiently.

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?

The description is adequate for a four-parameter tool whose schema is fully documented, and annotations cover the mutation-safety profile. It does not address conflict handling, return values, or what happens when blocked time overlaps existing appointments, leaving some operational gaps.

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%, so the parameters are already fully documented by the schema. The description's distinction between whole days and a few hours mirrors what the schema already says for start and end, and adds no new syntax or format details beyond that.

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 uses a specific verb and resource ('Block a staff member's calendar') and clarifies the effect ('so no one can book it'), including both supported modes. It is clear what the tool does, though it does not explicitly name or distinguish itself from siblings like remove_time_off or reschedule_appointment.

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 phrase 'Block a staff member's calendar' and the two modes (whole days vs. hours), but there is no explicit guidance on when to use this versus related tools such as reschedule_appointment or remove_time_off, nor any prerequisites such as required permissions.

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