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

Goes well beyond the annotations by disclosing the external side effects: confirmation emails with a Meet link to both parties, a calendar invite, and a 30-minute reminder. It also states the pre-booking confirmation workflow, which matters because the annotations declare openWorldHint=true and idempotentHint=false.

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?

Four tight sentences: what it does, the confirmation prerequisite, the outcome, then the sourcing rule and format constraint. Front-loaded with the core action and 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 5-required-parameter mutation tool with no output schema, the description covers trigger, prerequisite flow, side effects, and input sourcing. An agent has everything needed to call it correctly without guessing.

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 100%, so the schema already documents all five parameters; the description adds value by specifying the phone must be an Israeli number in 05X-XXXXXXX or +972 format and by tying 'start' back to get_meeting_slots output. That extra constraint is a meaningful addition beyond the schema's terse '(Israeli)'.

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+resource ('Books a 30-minute introductory meeting with Ariel Adler on Google Meet'), plus duration, host, and platform. It is clearly distinct from the sibling get_meeting_slots, which only lists availability.

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?

Explicitly routes the agent to get_meeting_slots for the 'start' value and instructs confirming all details with the user before booking. It gives clear affirmative guidance but no when-not-to-use or edge-case conditions (e.g., slot taken between listing and booking).

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