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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so 'Rein lesend' largely repeats structured data. The description does add useful semantic context about what the listing represents (the owner's earning path), but says nothing about result volume, pagination, or visibility/permission constraints on what is listed.

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?

Purpose is front-loaded in the first sentence, followed by the safety note and the sibling routing. It is compact overall, but the trailing '| EN: end user, customer, portal, notification, map, scope' keyword block is retrieval padding that adds no invocation value, and 'Rein lesend' duplicates the annotation.

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 read tool with full annotation coverage and no output schema, the description covers what the tool returns conceptually, why an agent would call it, and where to go instead for adjacent tasks. Only the shape/size of the returned list is left unspecified, which is a minor gap.

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 no parameter semantics to document; per the baseline for parameterless tools this sits at 4. The description correctly implies the call is unfiltered and global to the provider set.

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?

States a specific verb and resource with scope qualifiers: listing publicly bookable scopes belonging to *other* providers. It explicitly contrasts with ontouser_scope_index ('Deine eigenen Scopes'), so the agent can distinguish the two without opening either schema.

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?

Gives both the reason to use it ('um zu sehen, welche fremden Bereiche du buchen koenntest') and two named alternatives with their selecting conditions: ontouser_service_request for booking/placing an order, ontouser_scope_index for the user's own scopes. Nothing is left to inference.

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