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

There are no annotations, so the description carries the full burden of behavioral disclosure. It discloses an important side effect ('Deducts from account balance'), the staging nature of the operation, and the required follow-up via executeConfirmedAction. It could mention reversibility or permission requirements, but the material behavior is well covered.

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?

Three sentences carry all necessary information: purpose, side effect, required params, return value, and follow-up action. There is no filler or redundant restatement of the tool name.

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?

Given a nested object parameter, no annotations, and no output schema, the description covers the main call requirements and the post-call workflow. It would be more complete if it named the relevant sibling initiateTransfer or listed prerequisites, but the description is sufficient for an agent to call 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 description coverage is only 25%, so the description compensates by explaining domain with an example, describing authCode as the EPP code from the current registrar, and summarizing registrantInfo as contact details. The sessionKey parameter is already documented in the schema, so not repeating it is acceptable.

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 action and resource: 'Stage transfer of a domain from another registrar to OSIR.' It also names the required inputs, so the core purpose is clear. It does not explicitly contrast with the sibling initiateTransfer, leaving some ambiguity about how the two transfer-related tools differ.

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 gives clear operating context: stage the transfer, deducts from account balance, returns an actionId, present its summary to the user, and call executeConfirmedAction if approved. It does not state when to use initiateTransfer or cancelTransfer instead, but it provides enough workflow guidance to use this tool correctly.

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