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

Annotations already indicate idempotentHint=true and destructiveHint=false. The description adds context about optimistic concurrency ('exact current version') and idempotency ('durable idempotency key'), which enhances transparency beyond the annotations without contradiction.

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 a single 20-word sentence, very concise and front-loaded with the core action. However, it lacks structural elements like bullet points or separation of concerns that could improve readability for a complex tool.

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 the complexity (33 parameters, nested structures) and the presence of an output schema, the description is minimal. It covers high-level purpose but omits details about required parameters, format expectations, or processing logic, leaving gaps for an agent to infer.

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 0%, and the description does not explain any of the 33 parameters beyond grouping them as 'applicant, tenancy, and billing data.' This fails to compensate for the low coverage, leaving the agent to rely solely on parameter names and schema constraints.

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 defines the action ('Update') and the resource ('verified Elron Club application'). It specifies the scope ('bounded applicant, tenancy, and billing data') and distinguishes it from sibling tools like 'applications.start' or 'applications.submit' by focusing on updates to an existing verified session.

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 implies usage conditions by mentioning 'email-verified session,' 'exact current version,' and 'durable idempotency key.' However, it does not explicitly state when to use this tool versus alternatives or provide exclusion cases.

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