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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so safety is well covered. The description adds genuinely useful behavioral context by showing that the endpoint reply is truncated to the first 2 KB, though it says nothing about behavior when an id is not found or how many attempts are typically retained.

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 that enumerates the returned fields without filler or redundancy. Every clause earns its place.

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 full schema coverage, the remaining burden is modest, and the description usefully sketches what comes back including the response truncation caveat. Minor gaps: no error behavior and no pointer on sourcing the delivery id from the list tool.

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% for both required parameters (id, webhook_id), so the schema carries parameter meaning. The description adds no further detail on format, provenance, or where to obtain the delivery id, leaving it at baseline.

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 ("Get one webhook delivery") and enumerates the contents returned: attempts, status codes, latency, payload, and endpoint reply. The word "one" implicitly distinguishes it from list_webhook_deliveries, but no sibling is named 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?

Usage is only implied: fetch a delivery for inspection. The description never says when to prefer this over list_webhook_deliveries (to find an id first) or resend_webhook_delivery (to retry), and offers no exclusions or prerequisites.

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