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

The description discloses a key side effect: sending a welcome email. However, with no annotations, it does not cover other important behaviors such as prerequisites, idempotency, or error handling for duplicate accounts, leaving gaps for an AI agent.

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?

The description is one sentence, front-loaded with the purpose, and contains no irrelevant information. It is concise and well-structured.

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?

The tool has 3 parameters including an enum, no output schema, and no annotations. The description covers only the primary action and side effect, omitting details about return values, duplicate handling, or post-creation behavior, making it incomplete for autonomous use.

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 schema has 0% description coverage, and the description does not explain the meaning of parameters. It implies name and email are needed, but the 'plan' parameter and its enum options are not described, so the agent lacks essential guidance.

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 clearly states a specific action: create a new ExanorOS account and send a welcome email. This verb+resource combination effectively distinguishes it from sibling tools like create_contact or create_doc.

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 provides clear context for when to use this tool (creating an ExanorOS account). While it does not explicitly mention alternatives or exclusions, the tool's unique resource (ExanorOS account) makes the usage context obvious given the sibling list.

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