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 that results are 'recent delivery attempts,' implying a bounded, time-ordered result set, but it never explains how many are returned, whether pagination exists, or what failure information a delivery record carries. With annotations carrying the read-only signal, this is an adequate but thin contribution.

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, and the operative noun ('delivery attempts') lands early. It is efficient, though its brevity edges toward under-specification rather than maximal information density.

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?

There is no output schema, so the description should describe what a delivery record contains, how many are returned, and whether results are truncated or paginated. None of that is present, and with one of two parameters undocumented the definition leaves an agent guessing about the return shape and result bounds.

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 50%: `orgId` is documented against `org_list`, but `id` has no description at all. The phrase 'for a webhook endpoint' implies that `id` is the webhook endpoint identifier, which is a real but marginal addition over the bare schema. Baseline 3 is appropriate given the schema does half the work.

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 states a specific verb and resource: 'Lists recent delivery attempts for a webhook endpoint.' An agent can immediately tell this is the read side of webhook diagnostics. It does not, however, distinguish this from the sibling `webhook_deliveries`, which appears to serve the same function on a different scope (org webhook vs. webhook).

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?

There is no when-to-use guidance, no exclusion clauses, and no mention of the sibling `webhook_deliveries` or of `org_webhook_resend`, which is the natural follow-up action. The agent must infer from the name alone that this is scoped to org-level webhooks rather than individual ones.

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