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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=false, so the safety profile is covered. The description adds that a confirm-dry-run flow and idempotency validation exist, which is mildly useful context beyond the annotations, but it does not explain what a dry-run returns, what happens on failure, or why idempotentHint is false while an idempotencyKey is accepted.

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 with no filler, and the core action is front-loaded in the first clause. Every sentence carries information an agent can use.

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?

With no output schema, the description should say more about what creation returns and how the dry-run preview differs from a committed event, which it does not. Annotations and a fully documented schema cover the basics, so it is adequate but leaves meaningful gaps for a mutation tool.

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 every parameter including confirm and idempotencyKey is already documented in the schema. The description only echoes the existence of confirm and idempotency handling without adding format, constraint, or default detail beyond what the schema provides, so the 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 and resource ("Create a new calendar event") and scopes it to the farm's timeline, which is enough to separate it from get_calendar_events and delete_calendar_event. It stops short of naming those siblings explicitly, so the differentiation is implied by the verb 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?

The description gives no when-to-use, when-not-to-use, or alternative guidance. "Supports confirm and idempotency validation" only hints at the commit/dry-run mode, and even that condition is fully explained by the confirm parameter in the schema, not by the description.

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