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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the safety profile is known; the description adds real context on top: the capacity-wide effect of the removal, the preview-vs-apply gate, and the Pro plan requirement. It does not say whether the removal is reversible or how an invalid holidayId is handled, which keeps it off a 5.

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?

Three compact clauses, front-loaded with the action and its effect, then the confirm gate, then the plan requirement. No filler or restatement of the title.

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?

There is no output schema, but the description explains that a preview is returned when confirm is absent, so the agent knows what to expect. For a two-parameter destructive mutation with full annotations, this is nearly complete; only reversibility/error behavior is left implicit.

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 coverage is 100%, so both parameters are already documented. The description still reinforces the confirm semantics ('without it the result is a preview') and frames holidayId as a holiday of the user's calendar, adding modest but genuine meaning over the schema text.

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 ('Removes a holiday') and goes further by explaining the domain consequence: the day counts as a working day again in everybody's capacity. That distinguishes it cleanly from add_holiday and list_holidays without needing the schema.

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 the operative call condition clearly: 'Needs confirm: true; without it the result is a preview.' It does not explicitly name an alternative tool or state when not to use it, but the usage context (undo a holiday on the user's calendar) is unambiguous.

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