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

With no annotations provided, the description carries the behavioral burden. It discloses that the call deducts from the account balance, requires authentication, and returns an actionId pending user approval. It does not cover edge behaviors such as insufficient balance or invalid authCode handling, so a 5 is not justified.

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?

Four concise sentences, each adding necessary value: purpose, financial/auth implications, required parameters, and next-step workflow. The key purpose is front-loaded, and there is no filler or repetition.

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?

Covers the essential facts: what the tool does, cost, auth, required params, and the expected follow-up action. It does not mention failure modes or explicitly explain when not to use it versus transferDomain, but the staged-confirmation workflow is clearly enough for correct invocation.

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 only 33% (only sessionKey is described), so the description must compensate. It explicitly defines 'domain' with a concrete example and 'authCode' as an EPP authorization code from the current registrar, giving both required parameters meaningful semantics beyond the schema.

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: 'Stage initiation of a domain transfer from another registrar.' It clearly distinguishes the staging action from the later confirmation step by telling the agent to call executeConfirmedAction, and from the broader context of transferDomain.

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?

Provides a clear workflow: stage the transfer, get the actionId, present the summary to the user, then call executeConfirmedAction. It does not explicitly contrast with sibling tools like transferDomain or cancelTransfer, so it stops short of a full when-to-use vs alternatives guide.

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