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

Annotations already declare destructiveHint=true, openWorldHint=true, idempotentHint=false, and readOnlyHint=false, so the safety profile is covered. The description adds real value on top: the signed-request behavior of signing_secret, that 'test' fires a dummy event, and that 'delete' removes the webhook outright. It stops short of stating reversibility or permission requirements for delete.

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 one-line summary is front-loaded, followed by clean Actions and Args sections that are easy to scan. The webhook-explainer paragraph is slightly indulgent, but it establishes context that justifies the tool's existence, so little is wasted.

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 7-parameter, 5-action, no-output-schema tool, the description covers every action, every required argument, valid enum values, and common event names. It does not say what 'create' or 'get' return, nor whether 'list' paginates, which are the only remaining ambiguities.

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 only 14%, so the description must carry the load, and it does: it maps brand_id, action, webhook_id, url, events, and signing_secret to their owning actions, and enumerates valid webhook_id/url/events semantics. Only user_intent is unexplained in prose, but the schema itself documents it, so the gap is minor.

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 opening line gives a precise verb set (List, inspect, create, delete, test) plus the resource (outgoing webhooks), and the action list spells out exactly what each operation does. No sibling tool covers webhooks, so differentiation is moot, but the scope of each action is 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?

Each action is paired with its prerequisites ('get'/'delete'/'test' need webhook_id, 'create' needs url and events), and the description frames when webhooks are useful (Slack, Linear, Notion, custom stacks). It lacks explicit exclusions or a 'prefer X over this when…' clause, so it falls just short of a 5.

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