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

With no annotations, the description carries the full burden; it does disclose useful behavior — result ordering (newest first) and the fields each delivery carries (event, status, attempts, last HTTP status), which substitutes for the missing output schema. It says nothing about pagination behavior, the 200-item cap, or permission requirements.

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 front-loaded sentence with no filler: verb, scope, ordering, and payload fields in one pass. Nothing could be trimmed without losing information.

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?

No annotations and no output schema mean the description is the only behavioral spec, yet it omits the meaning of before_id pagination, the limit cap, and the status filter — the three things an agent must control to call this correctly. Return shape and ordering are covered, but the parameter contract is not.

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 0% across all four parameters, so the description must compensate and largely does not. It only implies endpoint_id ('one webhook endpoint'); the status filter, limit, and before_id cursor are never mentioned — and 'status' in the description reads as a returned field, not a filter, which risks confusion.

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 ('List') plus a precise resource ('deliveries to one webhook endpoint') and adds ordering ('newest first'). This is clearly distinct from webhooks_list (the endpoints themselves) and webhooks_retry, though it never names those siblings explicitly.

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 description gives no when-to-use guidance: it does not say to call this for monitoring/debugging failed sends, does not point to webhooks_retry when a delivery is dead, and does not explain when to page with before_id versus raising limit.

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