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

Annotations already declare destructiveHint=true and readOnlyHint=false, but the description adds value beyond them by stating the deletion is irreversible ('cannot be undone through the API') and restating the user-confirmation requirement. The leading 'WRITE, DESTRUCTIVE' label merely repeats the annotations, so it earns no extra credit, and no cascade/side-effect details are given.

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 short sentences with the destructive/irreversible warning front-loaded, followed by the usage gate and endpoint. Nothing is padded and the ordering matches decision priority.

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 2-parameter delete with full schema coverage, rich annotations, and no output schema, the description covers the only things an agent could get wrong: irreversibility, single-target scope, and the need for explicit user intent.

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% — both event_id and the confirm const are fully documented in the schema. The description adds only the implicit 'one event per call' framing, 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?

Specific verb + resource ('permanently delete one event or task') with scope ('one'), immediately distinguishing it from the create/get/update/list siblings. The DELETE endpoint path reinforces the exact operation.

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?

Explicit precondition: 'Only call this when the user clearly asked for this event to be deleted' — a real guardrail against speculative deletion. It doesn't name a sibling alternative (e.g., update_event if the user only wants a change), so it stops short of full routing guidance.

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