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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is established. The description adds the scoping that this is a single-destination read and lists what is included, but it does not describe response format or error/absence behavior. That is useful but not rich behavioral context.

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 sentence with no filler. The core action, resource, and returned information are front-loaded, making it easy for an agent to scan and act on immediately.

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 read operation with full schema coverage and strong annotations, the description covers what is needed: what is fetched and what fields are included. No return schema is provided, but the phrase about configured events/provider/account selection gives sufficient context, and there is no additional complexity to document.

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% and the destination_id parameter already has a detailed description in the input schema, including its source and the warning not to use the Unipile endpoint ID directly. The tool description does not need to add parameter semantics and does not go beyond the schema.

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 names a specific verb ('Get'), a specific resource ('one Nilyo-owned webhook destination'), and the returned content ('configured events/provider/account selection'). It is clearly distinguished from list/create/update/delete siblings by the 'one destination' framing.

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?

No when-to-use or when-not-to-use guidance is given; it never points to webhook_list_destinations for retrieving all destinations or to other webhook tools for setup/testing. The only hint is the word 'Get one,' which leaves the choice of tool to the agent.

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