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

With no annotations supplied, the description carries the disclosure burden and does well: it marks the call as free, states it takes no arguments, and lists the read-only information returned, implying no side effects. It stops short of explicitly saying the call is idempotent/read-only or that the returned addresses and prices are static reference data rather than live quotes.

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 sentences with the "[FREE]" qualifier front-loaded, then the action, then the usage triggers, then the payoff contents. Nothing is redundant and every clause carries information an agent can act on.

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 zero-argument documentation tool with an output schema, the description tells the agent when to call it, that it costs nothing, and which domains of information it returns. Any remaining detail about the exact response shape is covered by the output schema, so nothing essential 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?

The tool takes zero parameters, which is the baseline-4 case; the description reinforces this with "No arguments." There is nothing further the description could add about parameter meaning.

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 a specific resource (AgentWorld launch documentation) and the exact topics it covers: launching/registering, payouts, and paid data API costs. It also enumerates the concrete returns (endpoints, USDC payTo address, x402 facilitator, price list), so the agent knows precisely what it gets. It does not, however, distinguish itself from the very similar sibling agentworld_onboard_info, which an agent could plausibly pick instead.

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?

"Use this when an agent asks how to launch or register on AgentWorld, how payouts work, or what the paid data API costs" gives clear, concrete triggering conditions. There are no explicit exclusions or named alternatives, so the agent must infer the boundary with sibling info tools like agentworld_onboard_info or pay_to_call_info on its own.

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