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

No annotations are supplied, so the description carries the full burden. 'List' implies a safe read, and the dead-letter hint adds real operational context, but nothing is said about ordering (newest first?), retention window, total counts, or whether results are paginated beyond the limit parameter.

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?

Three short sentences with the resource named first and the two filtering behaviors front-loaded; every sentence carries actionable information and there is no filler.

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 parameterless-required, read-only list tool with no output schema and no annotations, the definition covers what the tool is and the two high-value filters. It leaves out result ordering, pagination behavior, and the return shape, which the agent needs to interpret output on its own.

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?

At 50% schema coverage the description does useful work by explaining that status=failed maps to dead-letter rows and that paymentRequestId is an internal UUID scoping to one checkout. However, endpointId is undocumented in both schema and description, and no meaning is added for limit beyond what the schema already states.

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 and resource ('List webhook delivery log') that an agent can immediately distinguish from list_merchant_webhooks (webhook configs) and replay_merchant_webhook_delivery (mutation). It stops short of naming those siblings, so the differentiation relies on the agent's inference.

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?

Gives two concrete conditional usages: status=failed to reach the dead-letter queue, and paymentRequestId to isolate one checkout's deliveries. There are no explicit when-not-to-use notes or pointers to the replay/get alternatives, which keeps it below a 5.

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