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

Annotations already declare destructiveHint=true, so the safety profile is partly covered; the description still earns credit by disclosing the cascade ('all its pages and data'), the irreversibility ('Permanently'), and the billing consequence ('Unused hosting is not refunded'). It omits authorization requirements and whether deletion is recoverable via any backup or version history, which is the remaining gap.

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 short sentences, zero waste, and the irreversible consequence is front-loaded ahead of the caution. Each sentence carries distinct information: scope, procedure, cost.

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 two-parameter destructive tool with full schema coverage and annotations present, the description covers what gets destroyed, the confirmation requirement, and the financial side effect — enough to call it correctly and safely. The one missing piece is routing relative to non-destructive alternatives like unpublish_site.

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 both `site` and `confirm_slug` are already documented in the schema. The description's confirmation instruction loosely motivates `confirm_slug` but adds no format or matching rules beyond what the schema states. Baseline 3 is appropriate when the schema carries the parameter 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?

States a specific verb and resource plus the cascade scope: 'Permanently delete a site with all its pages and data.' An agent immediately knows this removes the whole site, not a page or record. It does not explicitly distinguish itself from `unpublish_site` or `rollback_site`, which is the only thing separating it from a 5.

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?

'Confirm with the user first' gives a procedural prerequisite, which is useful. However, it never says when to choose this over the closely related sibling `unpublish_site` (take a site offline without destroying it), nor does it state any precondition such as ownership or plan requirements. Usage is implied rather than routed.

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