Book a time

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

Annotations already declare readOnlyHint=false, destructiveHint=false, openWorldHint=true, idempotentHint=false, so the write/side-effect profile is partly covered. The description adds genuine value beyond that: it discloses that the call creates a real booking plus a calendar event and sends notifications, which is the kind of irreversible-external-effect detail an agent needs before calling.

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 sentence, front-loaded with the action and its input source, then the side effects, then the safety caveat. No filler and no repetition of the title.

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 non-idempotent mutation tool with no output schema, the description covers the source of inputs, the side effects, and the confirmation requirement, which is close to complete. Minor gap: it does not say what the response contains or how to recover from a failed/duplicate booking, though annotations handle the idempotency signal.

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 63% and the description adds no field-level meaning beyond noting that intentId comes from find_available_times, which the schema already states. With most parameters self-documented in the schema, this sits at the baseline of 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 verb and resource ('Book a slot') and anchors it to the sibling that produces the input ('found by find_available_times'), which cleanly separates it from search/get/cancel/reschedule siblings.

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?

Gives a clear workflow precondition (use only with a slot returned by find_available_times) and an explicit caution to confirm details with the user first. It does not name an alternative for the related operations, but the sourcing dependency is stated plainly.

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