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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds the scoping context (limited to this agent's endpoints), but says nothing about ordering, pagination, or whether disabled webhooks are included.

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 short sentence with the scope qualifier front and center; nothing is wasted. It is arguably too terse rather than too long.

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?

With no output schema, the description should sketch what a returned webhook entry contains (id, url, enabled state) or how disabled endpoints are treated. Annotations cover safety and the simple no-param nature limits risk, but an agent still cannot predict the response shape.

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?

The tool takes zero parameters, so there is nothing for the description to explain; the baseline for a no-param tool applies. The description correctly implies an unfiltered listing of the agent's own endpoints.

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 ('Lists') and resource ('webhook endpoints') and adds scope ('this agent's'), which disambiguates it from the org-level sibling org_webhook_list. It does not explicitly name that sibling, but the scope qualifier carries the differentiation.

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 'this agent's' qualifier implies the agent should use this for its own endpoints rather than org-wide ones, but no explicit when-to-use or when-not guidance is given and no alternative (org_webhook_list) is named.

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