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

Annotations already declare destructiveHint=true and readOnlyHint=false, and the description's 'Delete' action is consistent with these. The description adds only the Microsoft 365/Outlook target context and ID-based scope, but does not disclose irreversibility, required confirmation, or post-deletion effects. With annotations covering the destructive nature, the additional value is minimal but acceptable.

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?

The description is a single sentence with no redundant words. It front-loads the action and target, making it immediately scannable and informative.

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?

The tool is simple, annotations cover the destructive safety profile, the schema covers both parameters with full descriptions, and an output schema is present. The description sufficiently states the operation and target, so no critical information is missing for selection or invocation.

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?

Both parameters have descriptive schema entries: id is 'Event ID from m365_list_events' and confirm is 'Set to true to confirm deletion (required)'. The description itself adds no parameter-specific semantics, but with 100% schema coverage, the schema already carries the semantic burden.

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 uses a specific verb ('Delete') and clearly identifies the resource ('calendar event from your Microsoft 365 / Outlook calendar by its ID'). It distinguishes itself from read/list/create/update sibling tools by the action and the explicit ID-based targeting.

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?

The description implies the tool is for deleting a specific existing event once its ID is known, and the schema's id parameter explicitly sources the ID from m365_list_events. It does not explicitly state when not to use the tool or name alternatives like update_calendar_event, but the context is clear enough for correct selection.

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