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

Beyond the annotations it discloses that this is an outbound POST to the caller's own webhook (consistent with openWorldHint), that no real event is emitted, and that the result immediately reveals reachability and key acceptance. It does not say how a failed delivery surfaces (error vs. a negative result payload).

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 compact sentences, front-loaded with the action and immediately qualified by 'kein echtes Ereignis'. The trailing '| EN: webhook, test, smoke test' keyword tag is padding but does not obscure the core content.

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 smoke-test tool with no output schema, the description covers what it does and what the caller learns from it. The missing piece is the shape of the result and how a non-responding endpoint is reported, which matters slightly more given there is no output schema.

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 no parameters, so the schema baseline is 4. The description correctly implies the target webhook is taken from the stored configuration rather than passed in, which matches the empty schema.

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 a specific action on a specific resource: a test POST to the user's own webhook, explicitly without firing a real event. That distinguishes it from siblings like webhook_save, webhook_show and webhook_delete, though it never names those alternatives.

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 conveys the intent well (immediately verify that the address responds and the key arrives), which implies when to use it. But it does not state prerequisites (a webhook must already be saved) or explicitly contrast with webhook_save/webhook_show, leaving the routing decision to inference.

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