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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is covered structurally. The description adds domain behavior by explaining what triggers each event (e.g., post.approved fires on the last workflow approval), but says nothing about auth needs, whether a signing secret is issued, or delivery semantics — useful additions against a low annotation-derived bar.

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?

Two sentences, front-loaded with the action, and the dense event enumeration earns its space by disambiguating valid values. Slightly parenthetical annotation of a couple events could be tightened but nothing is 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?

There is no output schema, so the description could reasonably explain what a successful creation returns (e.g., an ID or signing secret). For a low-complexity two-parameter tool it is mostly adequate, but the post-creation contract is left unstated.

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 the baseline is 3, but the description goes further by enumerating the valid event values and clarifying their trigger conditions, which the schema only calls 'Events to subscribe to'. It does not elaborate on the url parameter, which the schema already defines as an HTTPS URL.

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 new webhook'), making it clearly distinguishable from the sibling delete_webhook, get_webhook, list_webhooks, and update_webhook. It does not name a sibling explicitly, but the create/list/get/delete verb family makes the intent unambiguous.

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?

The description gives no when-to-use guidance, no prerequisites, and no comparison to alternatives like update_webhook (for modifying an existing hook) or list_webhooks (for inspecting them). The event list informs invocation but not tool selection.

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