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

Annotations cover the safety profile (not read-only, not idempotent, not destructive), and the description adds a genuinely important behavioral trait beyond them: the operation creates a NEW booking rather than mutating the existing one in place. That implies a new booking identity/ID the agent should expect. It does not mention permissions or whether the client is notified, but it is well above the annotation baseline.

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 tight sentences with zero waste; the primary action is front-loaded and the mechanism follows immediately.

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 simple two-parameter mutation with full schema coverage and no output schema, the description is nearly sufficient. The main residual gap is that it doesn't tell the agent what the call returns (e.g., the new booking's ID), which matters given the create-new semantics.

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 'id' and 'startTime' are already documented in the schema. The description adds no format details (e.g., ISO 8601 expectations, timezone) beyond what the schema provides, so baseline 3 applies.

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 (Reschedule) and resource (booking) and adds a concrete mechanism: it creates a new booking and marks the old one as rescheduled. This clearly separates it from sibling booking operations like cancel_booking or complete_booking, though it doesn't name them 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?

No guidance on when to choose this over alternatives (e.g., cancel + rebook) or any prerequisites such as the booking needing to be confirmed. The use case is implied by the name but never stated.

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