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

Annotations only supply destructiveHint=true, so the description carries the behavioral burden. It discloses the key side effect that the customer is "created if new" and that body requires the customer's email, which the annotations do not convey. It omits auth/permission and error behavior, but adds meaningful context beyond the structured fields.

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 short clauses, no filler, and the WRITE marker plus operation are front-loaded before the parameter guidance. The trailing REST endpoint note is marginally useful but does not distract, so structure is efficient.

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?

For a write tool with a nested customer object and no output schema, the description covers the required input logic and the significant side effect of creating a customer. It does not address the return payload or error cases, but no output schema exists to relieve it of that, so a small gap remains.

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 100%, so the baseline is 3, but the description adds cross-parameter logic the schema does not encode: the customer_id-vs-customer alternative and the dependency that body needs a customer email. That relational guidance goes beyond the per-field descriptions.

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?

Specific verb+resource: "create an email ticket," front-loaded with a "WRITE:" marker. It is clearly differentiated from sibling creators like enchant_create_customer and from enchant_reply_to_ticket, so an agent can pick it without opening a schema.

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 explains how to satisfy the customer linkage (customer_id OR customer) and the optional first message, which is genuinely useful context. However, it never states when to prefer this tool over siblings such as reply_to_ticket or update_ticket, and gives no exclusions, so usage is only implied.

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