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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered. The description adds meaningful domain context by explaining that hooks are URLs receiving POSTed events. It does not discuss return volume, ordering, or whether webhook secrets are exposed, leaving some behavioral gaps.

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 short sentences, front-loaded with the resource definition and followed by the related-tool pointer. Every clause earns its place with no redundancy.

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 an output schema present and annotations covering safety, the description does not need to explain return values. It supplies the domain meaning of a hook and the sibling tools used to manage hooks. A small gap remains in not explicitly stating the tool returns all subscriptions for the account.

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 and the schema is fully described, so there is nothing for the description to compensate for. Baseline 4 applies since no parameter semantics are needed.

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 description defines the resource precisely: 'REST-hook subscriptions — the URLs MightyAutomation POSTs events to.' That is more informative than the name alone and distinguishes it from unrelated sibling list tools (contacts, automations, events) by domain. It stops short of stating the verb 'list,' which the tool name and title already supply.

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 'Pair with create_hook / delete_hook to manage them' does give useful context about the surrounding workflow. However, it never says when to call list_hooks versus those alternatives, nor does it state any preconditions. Usage is implied rather than explicit.

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