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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the safety profile is covered. The description adds real value beyond that by clarifying the blast radius — inbound messages keep arriving and stay readable via wa_list_messages, only the push stops — which tells the agent no data is lost. It stops short of saying whether the endpoint configuration is removed irreversibly or what happens on a second call.

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 with zero filler; the effect leads and the important reassurance (messages still readable) follows immediately. Every clause earns its place.

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?

An output schema and annotations carry the return and safety details, so the description only needs the behavioral picture, which it largely provides. The remaining gap is whether deleting the webhook is reversible or errors when no webhook is configured — a real but minor omission for a zero-parameter tool.

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 and the baseline of 4 applies. No parameter-level claims are made or needed.

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?

Names a specific action (stop push delivery) rather than restating the tool name, and describes the effect in user terms. However, it never distinguishes deletion from mere disabling, despite the sibling wa_enable_webhook sitting right next to it — an agent cannot tell whether this removes the endpoint configuration or just pauses it.

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 usage context is only implied: 'stop delivering inbound messages' suggests when to call it, and the note that messages remain available points an agent at wa_list_messages as the fallback. There is no explicit when-to-use/when-not, and no routing guidance versus wa_set_webhook or wa_enable_webhook.

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