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

Annotations already declare destructive, idempotent and open-world behavior, yet the description still adds value: it spells out the no-op case ('Removing a webhook that is not set changes nothing'), the auth prerequisite ('Needs the personal token'), and the boundary of the effect (inbox delivery continues). It says nothing about the response or whether stored webhook config is discarded.

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?

Four short sentences, front-loaded with the effect, then usage, then side-effect scope, then the auth note. The opening sentence duplicates the title almost verbatim, which is mild redundancy, but nothing else 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 parameters, no output schema, and annotations carrying the safety profile, the description covers the remaining agent-relevant facts: idempotency, auth requirement, and what is not affected. It leaves open whether the webhook registration is destroyed or merely deactivated, which is the one missing detail for a destructive operation.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; per the baseline for a 0-param schema this sits at 4. The prose correctly implies a single implicit target (the caller's own webhook) rather than a webhook id.

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 pairs a clear action ('Stop pings', 'Removing a webhook') with the concrete effect and disambiguates against check_inbox by noting messages still arrive. It never names set_webhook/get_webhook as the counterpart operations, so sibling differentiation relies partly on the tool name rather than the prose.

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?

It states an explicit triggering condition ('when your server should no longer get pings, for example before it goes away'), which is a real when-to-use cue. It stops short of naming the alternative tool (set_webhook) or saying when not to bother, so it is clear context without exclusions.

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