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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the workspace-wide scope, which is useful. It doesn't mention pagination, ordering, or whether inactive webhooks are included, but for a simple list operation with strong annotations, this is adequate.

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 short sentence that fully conveys the tool's purpose. No wasted words, and the key scope qualifier 'every' and 'in the workspace' are included.

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 zero-parameter, read-only list tool with an output schema present, the description is nearly complete. The only minor gap is not mentioning pagination or result limits, but the output schema likely covers the return shape, and the annotations cover safety.

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?

There are zero parameters, so the description doesn't need to explain any. The schema coverage is 100% (vacuously), and the description correctly implies no inputs are needed. This is a case where the baseline 4 for zero params 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?

The description 'Lists every webhook endpoint in the workspace' clearly states the action (list) and resource (webhook endpoints), and the scope (workspace-wide). It distinguishes from get_webhook (single) and create/update/delete_webhook siblings, though it doesn't explicitly name them.

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 implies this is the tool to use when you need all webhooks in the workspace, and the sibling list shows create/update/delete/get variants. However, it doesn't explicitly state when to prefer this over get_webhook or mention any pagination or filtering considerations.

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