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 it mirrors GET /api/v1/webhooks/events, reinforcing the non-mutating nature, but says nothing about auth requirements, rate limits, or whether the key scope narrows results.

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?

Two short sentences, front-loaded with the returned information and ending with the endpoint mapping. The telegraphic phrasing is slightly cryptic, but 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?

With no output schema, the description usefully enumerates the response fields (events, filtered_out, available), which is the main thing an agent needs to interpret results. For a single-optional-param read tool with annotations, this is close to sufficient; only the meaning of each bucket and ordering is left implicit.

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 is exactly one optional parameter with 100% schema description coverage, and that description already explains the rk_test_/rk_live_ format and points to get_sandbox_key and request_access. The description adds nothing further about the api_key parameter, 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?

The description names the resource (webhook event subscriptions for a key) and enumerates the three result buckets (events, filtered_out, available), which tells an agent exactly what data comes back. The verb is implicit rather than stated, but the 'GET /api/v1/webhooks/events' reference and the get_ vs set_webhook_events sibling make the read intent unambiguous.

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 statement of when to call this versus set_webhook_events, redeliver_webhook, list_webhook_deliveries, or test_webhook. The agent must infer from the name that this inspects configuration rather than delivers or mutates events.

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