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

Annotations already declare idempotent, non-destructive, closed-world write behavior, so the safety profile is covered. The description adds meaningful scope ('the flag other people see'), but says nothing about how this interacts with do-not-disturb state, active calls, or whether it takes effect immediately.

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 front-loaded sentence with no filler; the resource and the key qualifier come before the value list. Nothing needs trimming.

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 one-parameter tool with full annotation coverage and no output schema, the description gives enough to call it correctly. The only real gap is the lack of guidance on its relationship to the do-not-disturb siblings.

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 0% and the single parameter has no description, so the description must compensate. It does list the three states matching the enum, but that largely restates the schema's enum rather than explaining what each state means for the agent's own session.

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 (Sets) plus resource (directory availability flag) and enumerates the three accepted states. The phrase 'other people see' distinguishes it from internal-state tools like get_expert_availability, though it never names a sibling explicitly.

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 visibility framing ('other people see') implies when an agent would set this, but there is no explicit when-to-use, no exclusions, and no mention of the closely related set_do_not_disturb or clear_do_not_disturb siblings that an agent could easily confuse with this one.

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