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

Annotations only convey that this is not read-only, not idempotent, and not destructive. The description adds substantial behavioral detail: a confirmation email is sent, the account is unusable until activation, only the address owner can activate it, and the reply is identical for already-registered addresses. This goes well beyond the structured annotations.

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 compact, action-first, and every sentence earns its place. It front-loads the core action and then states the most important behavioral caveats without filler.

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 description covers the essential activation flow and duplicate-registration behavior, which are the non-obvious aspects of calling this tool. However, with no output schema, it does not describe the shape or content of the response beyond noting it is identical in both cases. This is a minor gap for a simple 4-parameter creation tool.

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 schema already documents all four parameters. The description reinforces that email and password are the primary inputs but does not add new meaning beyond what the schema provides for name or agent_attribution.

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 opens with a specific action verb and resource: 'Create a Scriptivox account from an email address and password.' It also clarifies that no credential is needed, which distinguishes this registration flow from authenticated account-management or API-key tools.

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 gives clear usage context by stating what this tool is for and the key caveat that the account is unusable until the confirmation link is followed. It does not explicitly name sibling alternatives or when-not-to-use cases, but no sibling tool covers account creation, so the context is sufficient.

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