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

With no annotations, the description carries the full burden, and it does well: it discloses partial-failure semantics ('null when the overview query fails'), authorization scoping (only own domains), and the composite return payload. It lacks detail on permissions beyond ownership, pagination, or rate limits, but the behavioral profile is materially richer than the schema.

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?

Front-loaded with the core action and resource, then adds return-shape detail. The single long sentence is dense and slightly overloaded with the parenthetical about the REST detail route, but every clause is informational rather than filler.

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?

There is no output schema, so the description must describe return values, and it does so thoroughly (DTO, sync job history, transfer overview plus null behavior). Combined with the ownership scoping, an agent has everything needed to call this correctly.

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 there is one required parameter, but the description only says 'by id' without adding format, uniqueness, or lookup semantics beyond what the schema already types as a uuid string. Adequate but minimal value-add.

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 ('Get') and resource ('one of the authenticated user's domains by id'), and enumerates exactly what is returned (domain DTO, delegation sync job history, transfer overview). This clearly distinguishes it from domains_list, which handles collections.

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?

Implicitly scoped to single-domain retrieval and adds the crucial ownership boundary ('Not-found for domains owned by others'), which tells the agent this is an authenticated, self-scoped lookup. It does not explicitly name domains_list as the alternative for enumeration, so it stops short of full routing guidance.

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