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

Annotations already cover the safety profile (readOnlyHint=true, openWorldHint=false), so the description's marginal value is in disclosing that no auth is required, that the response varies with authentication state (balance/servers only if authenticated), and the cross-cutting conventions (`next_steps` on all responses, `error.fix` + `error.next` on all errors). It does not describe size, pagination, or caching behavior, so a 4 rather than a 5.

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?

Front-loaded with the imperative 'Call this FIRST,' then enumerates the returned payload in a single dense sentence. Every clause carries information (flow, human step, auth rule, error fixes, limits, personalization), though the run-on em-dash construction and the repeated 'Call this first' could be tightened slightly.

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?

With no output schema, the description carries the full burden of describing the return value, and it does: the response contents are enumerated, including the conditional `you_are_here` block. It also states prerequisites (none), the single human step (crypto checkout_url), and the conventions governing sibling tools, leaving nothing material unstated for a zero-parameter entry point.

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 per the scoring rules. The description correctly reinforces this by stating 'Requires: nothing' rather than inventing parameter detail, and the example arguments it mentions belong to the downstream tools, not to this call's schema.

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?

States a specific verb and deliverable: it 'returns the whole flow in one response' — the exact tool order for renting a VPS and running code, auth rules, error fixes, limits, and a personalized `you_are_here` block. This is unmistakably an onboarding/orientation tool, distinguishable from every sibling like login, order_vps, or run_code, which perform the actual operations.

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?

Explicitly prescribes the sequence: 'Call this FIRST' at both the opening and the closing line, plus the precondition 'Requires: nothing.' An agent knows exactly when to invoke it (before anything else) and that it needs no credentials. It also explains the alternative pattern — every other tool response carries `next_steps` and every error carries `error.fix`/`error.next` — so the agent knows when a follow-up call to this tool is unnecessary.

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