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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds real behavioral context beyond that: fixed 30-minute duration, availability only from tomorrow onward, and the Israel-time business window, plus the shape of each returned slot.

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?

Two sentences, both front-loaded with the constraints that matter (duration, host, window, timezone) before the downstream hand-off instruction. No filler.

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 single-parameter read tool with no output schema and full annotation coverage, the description supplies the fixed rules of the slot set, the field name/format of the returned value ("start", ISO UTC), and the next step. Nothing an agent needs to call it correctly is missing.

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 single parameter has a documented default (7), min (1) and max (30), so the schema carries the semantics. The description never mentions the 'days' parameter, so it adds nothing on top of the schema — baseline 3.

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?

States a specific resource (free 30-minute meeting slots) with concrete scoping: host (Ariel), platform (Google Meet), day window (Sunday–Thursday), hours, timezone, and start horizon (from tomorrow). This is clearly distinguishable from the sibling book_intro_meeting, which consumes its output.

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?

It explicitly routes the agent: the returned "start" value is what you pass to book_intro_meeting, so the lookup→book sequence is unambiguous. It does not state when not to use it (e.g., if a meeting is already booked), but the intended context is clear.

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