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

Annotations already disclose readOnlyHint=false and destructiveHint=false, so the mutating-but-non-destructive profile is known. The description adds nothing beyond that: no auth requirements, no idempotency or duplicate-URL behavior, and no note that the endpoint becomes active immediately.

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?

A single front-loaded sentence with zero filler, exactly the right size for a simple create tool. It is efficient, though it forgoes the opportunity to add any routing or prerequisite information.

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 4-parameter tool with full schema coverage and no output schema, the basics are covered by the schema, so the description need not explain return values. However, it leaves out behavioral details an agent would want, such as whether webhook secrets are issued or how to verify deliveries.

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%, with url, events, customerId, and description all documented in the schema including the full event list and the superadmin scoping of customerId. The description adds no syntax or semantic detail beyond the schema, 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 (Create) and resource (webhook endpoint) plus the intent (receiving event notifications). An agent can distinguish it from delete_webhook, get_webhook, and update_webhook, though it does not name those siblings explicitly.

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?

There is no when-to-use guidance, no mention of alternatives, and no prerequisites such as required permissions or notes about the superadmin customerId path. The 'receiving event notifications' clause implies context but does not instruct the agent when this tool is the right choice.

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