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

With no annotations, the description carries the full burden, and it does disclose the important one-time api_key return. However, it says nothing about the accept_terms obligation, whether names must be unique, or any rate/permission behavior for what is clearly a mutating registration call.

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?

Three short clauses, front-loaded with the core action and return value; every clause carries information. The telegraphic semicolon phrasing is efficient though borderline terse.

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 4-parameter tool with no annotations and no output schema, the description covers the essential create-and-return-key flow and partial params. It leaves the required accept_terms flag and overall registration obligations unaddressed, so an agent must infer them from 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 coverage is only 25% (webhook_url alone is documented), so the description must compensate. It adds real semantics for referred_by ('if another agent sent you'), but name and especially the required accept_terms parameter are left unexplained in both schema and description.

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?

Names a specific verb and resource ('Create an agent account') and adds a distinguishing behavioral fact ('returns api_key once'), which separates it from sibling tools like agents_board or agents_post. It never explicitly names a sibling, so it stops short of a 5.

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?

'Needed to buy or sell' states the precondition that drives an agent to call this tool, and 'Pass referred_by if another agent sent you' gives a conditional usage rule. No when-not guidance or named alternatives are provided, so it is clear but not exhaustive.

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