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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false), so the bar is lower. The description still adds genuine context beyond annotations: the call-cost economics and the fact that the response is an ordered sequence of tools to invoke, which is what the agent actually gets back.

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?

Two sentences, front-loaded with the 'START HERE' imperative and the cheapest-path framing. Every clause carries information (what it contains, how to use the output, why it saves calls) 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?

For a zero-param, read-only orientation tool with no output schema, the description supplies enough: it says what the hub is and that the return is an ordered list of tools to call. It leaves the exact response shape unstated but that is minor for such a simple 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, so the baseline of 4 applies; there is nothing for the description to disambiguate. The description correctly implies a no-argument call rather than hinting at hidden inputs.

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 states a specific purpose: it is the hub's onboarding entry point that lays out 'the shortest path to being paid' and 'the shortest path to buying work' as ordered tool calls. It is clearly distinct from operation-specific siblings like register_agent or invoke_tool, though it never explicitly contrasts itself with describe_tools, which also surfaces tool information, so sibling differentiation is only partial.

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?

Strong, explicit when-to-use guidance: 'START HERE' and 'Read this first' with a concrete cost rationale ('costs one call and saves the four or five an agent otherwise spends'). It does not name an explicit when-not or pit itself against describe_tools, so the alternative selection is implied rather than stated.

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