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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds real context beyond that: a hard cap of ten results (so the agent should not expect pagination) and that each entry carries its last delivery. It does not say what happens if more than ten endpoints exist, which is the remaining gap.

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?

One sentence, front-loaded with the scope, with the result cap and payload detail appended in parentheses. Nothing is wasted.

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 simple read-only list tool with no output schema and full parameter coverage, the essentials are present, but the missing differentiation from list_webhooks and the silence on truncation behavior leave an agent guessing in a crowded webhook toolset.

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?

Only one parameter ('purpose') with 100% schema coverage, and that schema text already explains the field thoroughly. The description adds no parameter meaning, so the baseline 3 applies.

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 ('Lists the workspace's webhook endpoints') plus the returned payload ('with their last delivery'). It is clear in isolation, but it never distinguishes itself from the sibling list_webhooks or from desk_list_webhook_deliveries, so an agent cannot be sure which one to pick.

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 explicit when-to-use guidance and no named alternative. Given two near-identical list tools (list_webhooks, desk_list_webhooks) and a deliveries sibling, the description should say when this one is correct, and it does not.

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