list_domains

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

No annotations are provided, so the description carries the burden, but 'List' clearly signals a non-mutating read operation and the description tells what is returned: all registered domains with their activation status. It does not cover pagination or exact output shape, but for a zero-parameter listing tool the core behavioral surface is well disclosed.

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: the first states the core function, the second gives practical usage guidance. There is no redundant or filler 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 simple zero-parameter list operation with no output schema, the description provides the essential context: what is returned and when to invoke it. It could add detail on how activation status is represented, but nothing critical is missing for the agent to select and call this 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 has no parameters and schema coverage is 100%, so there is nothing missing to explain in the description. The rubric baseline for zero parameters applies, and no parameter-specific description is necessary.

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 specific verb and resource: 'List all registered domains and their activation status.' It clearly distinguishes itself from the sibling activation/deactivation tools by focusing on discovery and status rather than mutation.

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 description explicitly says 'Use this to discover available domains before calling activate_domain,' giving a specific when-to-use instruction and referencing a dependent sibling. This tells the agent exactly when this tool is the correct choice.

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