create_handle

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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, and openWorldHint=true, so the description needs only to add context beyond that — and it adds none. It doesn't mention that re-posting creates a duplicate handle (non-idempotent), that .it/.fr/.nl contacts have jurisdiction-specific required fields, or what the response contains. No contradiction, but pure restatement of the title.

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?

It's short, but not concise: the sentence 'Create specific handle' is repeated verbatim after the endpoint annotation, so half the text is pure duplication. Front-loading is fine only because there is almost no content.

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?

This is a create tool with a deeply nested 20+ field body, no output schema, and jurisdiction-dependent required fields — a case where the description should carry real weight. It says nothing about what a successful response returns (handle ID, validation state) or which fields matter for which TLD, leaving the agent to reverse-engineer the schema.

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 100%, so the nested body fields (handleType, pin, legalStatus, nicItEntityType, etc.) are already documented in-schema, making 3 the baseline. The description contributes nothing about the body — no example payload, no conditional requirements, and no explanation of the x-trace-id header.

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 has a verb (Create) and a resource (handle), and the HTTP endpoint POST /v1/domains/handles confirms it's a registrant-handle creation call. But 'specific' is filler and the sentence is duplicated, so there's no differentiation from siblings like update_handle or create_user beyond the noun 'handle'.

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?

No when-to-use guidance, no preconditions, and no mention of alternatives (e.g. update_handle for existing handles, list_handles to check for duplicates). The agent must infer from the name alone that this is the creation path.

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