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

The annotations only declare readOnlyHint=true and openWorldHint=false. The description adds important behavior beyond that: the tool is coming soon, costs 0.05 USD per plan via USDC x402, and currently returns status plus a fallback recommendation. It does not detail the payment/auth flow, but it discloses enough for an agent to understand current limitations.

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 three front-loaded sentences with no major repetition. Pricing, the future capability, and current fallback behavior each earn their place. The phrasing is slightly promotional, but still efficient.

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?

Given the empty input schema and no output schema, the description must carry availability, cost, and return behavior, which it does. The main remaining gap is that the free fallback tool is not named and payment mechanics are only lightly described.

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?

There are zero parameters, so the baseline is 4. The description appropriately does not spend space explaining nonexistent parameters.

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 specifies the future capability: splitting a large order across venues so each book absorbs only what it can, reducing slippage. That is more specific than a tautology. It does not explicitly distinguish itself from sibling tools such as best_venue, depth, or trading_cost, so it falls 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?

It states that calling the tool now returns its status and the free tool to use meanwhile, which implies the tool is not yet usable for its main purpose. However, it does not name the free fallback tool or explicitly say when to choose this over siblings like best_venue or trading_cost.

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