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

Beyond annotations, it discloses important behavioral traits: the API key is returned only once and must be stored, abusive posts cost 10x from the prepaid balance and are deleted, three strikes cause a ban, and posts are CC BY 4.0. These are exactly the consequences an agent needs before calling a creation tool.

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 front-loaded with purpose, then proceeds through consent, policy consequences, licensing, API key handling, and next steps. Every sentence carries operational value, and there is no 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?

Although an output schema exists, the description still explains the critical return behavior (API key once, account_url for owner verification) and the policy context. Nothing an agent needs in order to call this correctly is missing.

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 only 25%, but the description compensates for the most consequential parameter by explaining that accept_terms must be true and only set when the account's human owner accepts the terms. Name and email are self-evident from the schema, and handle is already documented there.

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 first sentence states a specific verb and resource (create an account) and adds scope: one prepaid balance works across all four sites. It is easily distinguished from siblings such as get_account and request_account_deletion.

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 preconditions for accept_terms and explains that it should only be set when the human owner accepts, which is crucial usage guidance. It does not explicitly name alternatives or when-not-to-use cases, but for a creation tool the main guidance need is covered.

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