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

Annotations declare destructiveHint=true and readOnlyHint=false, and the description adds the crucial fact that the operation is IRREVERSIBLE once dry_run=False, plus a recommended confirm-before-commit workflow. This is meaningful context beyond the annotation flags, not a restatement of them.

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?

Front-loads the action and the irreversibility warning, then gives the confirm workflow. Every sentence earns its place, though the scope note and workflow could be tightened slightly.

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?

Output schema exists, so return values needn't be explained; annotations cover the safety profile; the description supplies the irreversibility, scope limits, and confirm workflow an agent needs to call it safely. Nothing essential is missing for a destructive create 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 all five parameters (including dry_run, timestart, duration_seconds) are already documented in the schema. The description reinforces the dry_run semantics behaviorally but adds little parameter-level 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 personal calendar entry') and immediately delimits scope by noting only personal ('user') events are supported, whereas course/group events are not creatable. This clearly separates it from siblings like list_calendar_events and delete_calendar_event.

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?

Gives an explicit two-step protocol: call with dry_run=True (default) first, show the preview to the user, then call again with dry_run=False only after explicit confirmation. It also states the exclusion (no course/group events), so when-to-use and when-not-to-use are both covered.

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