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

Annotations already declare readOnlyHint=true, so the description carries a lower burden, but it adds nothing beyond that: no statement about error behavior for unknown or deleted ids, no auth or rate-limit context, and no indication of what a webhook subscription record contains.

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 resource and lookup key front-loaded; nothing redundant. It is nearly the minimum viable statement and wastes no words.

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 getter with readOnly annotations this is close to adequate, but with no output schema the description gives no hint at the shape of the returned webhook object or what happens when the id is not found.

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 0%, so the description must compensate. It does clarify that the lone 'id' parameter identifies the webhook subscription (rather than a call, user, or other resource), but it adds no format, prefix, or validity detail beyond that.

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 ('Get') and resource ('one webhook subscription'), with scope limited to a single item via 'by id'. This implicitly contrasts with the sibling spokephone_list_webhooks, though it never names that alternative.

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 phrase 'by id' implies the tool is only for the case where an id is already known, but there is no explicit when-to-use, when-not, or pointer to spokephone_list_webhooks for discovery.

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