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

The description adds significant behavioral context beyond the annotations: it discloses that a signed checkout is returned, that the svc_ ticket is shown once and is the only delivery-retrieval credential, and that there are security constraints on the target. It doesn't repeat annotation details. The only gap is not mentioning idempotency or whether the checkout has an expiration, but for a creation tool the disclosure is strong.

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 three sentences, front-loaded with the core action and critical security constraint. The last sentence about the svc_ ticket is compact and important. No waste, though the security reminder is slightly redundant with the schema.

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 creation tool with annotations, an output schema, and a 5-param schema, the description covers the critical missing pieces: the nature of the return (signed checkout and one-time ticket) and the security constraints. It doesn't mention the publishTarget parameter or how errors are handled, but those are less critical. Overall, an agent has enough to invoke it 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 coverage is 80% and the schema already describes four of five parameters with explicit security warnings. The description echoes the 'no credentials/tokens/secrets' constraint for notes and targetUrl, but adds no new information about parameter usage, format, or semantics. Since the schema does the heavy lifting, the baseline would be 3, but the description's repetition without added value warrants a lower score.

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 names the verb ('Create') and two resources ('private ticket' and 'signed Base USDC/ETH checkout'), and scopes it to 'one published professional service'. It doesn't explicitly contrast with sibling tools like check_service_order or list_services, but the action and deliverable are clear enough.

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 when to use it (for a published professional service) and lists constraints on the target (public HTTPS/GitHub). However, it doesn't state when not to use it or name alternatives for related tasks like checking an existing order or listing services.

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