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

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so the safety profile is covered; the description still adds value by stressing 'Permanently' (irreversibility), naming the plan requirement, and disclosing the exact return payload. It does not, however, cover any rate limits or downstream effects on webhook deliveries.

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 short and front-loaded, with required-param, return, and cost lines that are easy to scan. It is slightly redundant, repeating the Pro/Enterprise requirement twice and listing 'Cost: 0 credits' for a plan-gated delete, but nothing is truly wasteful.

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 one-parameter destructive tool this covers the essentials: scope, plan prerequisite, exact return value, and cost. With no output schema the description fills the return-value gap, though it omits what happens to already-fired webhooks or error behavior.

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?

With a single parameter and 100% schema description coverage, the schema already fully documents 'id'. The description only restates the requirement ('REQUIRED: id (alert ID)') without adding format, source, or constraint detail beyond the schema, so the baseline of 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?

The description opens with a specific verb+resource ('Permanently delete a webhook alert'), and the notion of 'webhook alert' plus the 'delete' verb clearly separates it from create_market_alert, update_market_alert, and list_market_alerts. An agent can place it among its siblings without opening any 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?

It states a gating prerequisite ('Requires Pro or Enterprise plan'), which is useful usage context, but it gives no explicit when-to-use vs when-not guidance and does not point to update_market_alert as the non-destructive alternative. Usage is implied by the verb rather than spelled out.

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