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

No annotations exist, so the description carries the full load, yet it never says what the tool returns (boolean, verdict, legal reasoning?), that it is a read-only check with no side effects, or how the UWG outcome varies with the consent flag. The only behavioral signal is the legal framing and the implied jurisdiction (DE), which is useful but far short of what a compliance-judgment tool needs.

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?

It is short and front-loads the decision question, so nothing is padded. But the compression is excessive: mixed German/technical shorthand with semicolons and pipes reads as a fragment rather than a definition, and space saved is space the agent must reconstruct.

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 five parameters, three of them required, no annotations, no output schema, and zero schema descriptions, this one-line definition is not sufficient for correct invocation. Key inputs and the expected result are simply absent.

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?

Schema coverage is 0% and 5 parameters exist, but the description adds meaning only for two of them (kanal, empfaenger), where it supplies enum values the schema lacks (email|telefon, verbraucher|unternehmen). The required parameter einwilligung_belegt is never mentioned, and bestandskunde and verantwortlich are entirely unexplained.

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 states a concrete question the tool answers ("Darf ein Agent diese Werbung senden?") plus the legal basis (DE, § 7 UWG), which identifies a pre-send advertising compliance check rather than a generic validator. It is distinguishable from the sibling tools (invoice/VAT/duties checks), though it never says it returns a verdict, and the telegraphic style makes the purpose slightly harder to grasp than it needs to be.

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?

Use is only implied: you ask the question before sending advertising. There is no explicit statement of when to call it, whether it may be called repeatedly, or what to do when consent evidence is absent. The allowed channel/recipient values hint at scope but do not route the agent to or away from alternatives.

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