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

Annotations already declare a non-read-only, idempotent, non-destructive, closed-world mutation, so the safety profile is covered. The description adds two things annotations cannot convey: consent must be obtained, and an updated invite is sent to the attendee as a side effect. It stops short of saying whether the original invite is rescinded or how failures surface.

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 short sentences, zero filler, with the core action and its constraint front-loaded. Nothing could be removed without losing information.

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?

An output schema exists, so return values need no explanation, and the tool is a simple two-parameter mutation whose inputs are fully documented. What remains missing is modest: failure behavior when the slot is taken and whether the prior booking is replaced atomically.

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 both parameters are already documented in structured form, and the description only echoes that starts_at comes from inite_slots. booking_key is not mentioned at all beyond the schema, so the description adds little beyond the baseline.

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 gives a specific verb and resource ("Move a booked call") plus the source of the new time ("from inite_slots"), which implicitly separates it from inite_book_call and inite_cancel_call. It never names those siblings explicitly, so the differentiation is inferred rather than stated.

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?

"with the person's consent" is a real precondition and "from inite_slots" hints that availability must be fetched first, but the description never states when to move versus cancel-and-rebook, nor what to do if the requested time is unavailable. Usage is implied rather than spelled out.

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