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

No annotations are provided, so the description carries the full behavioral burden. It does disclose the pricing model (x402, 0.01 USDC on Base, pay-per-use), which is genuinely useful, but says nothing about what the operation does to the input, what it returns, or any limits.

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?

It is short and front-loaded, but the 'Auto-created from research:' prefix is dead weight and the single sentence is abstract rather than actionable.

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 one-parameter, no-output-schema, no-annotation tool, the description still leaves the most important operational facts unstated: the expected input content and the shape of the result. Complexity is low, but the essential information 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?

Schema description coverage is 100% with a single parameter, so the baseline is 3. The description adds no meaning about what 'input' should contain (the schema label is just 'entrada'), so it neither compensates nor detracts.

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 conveys a purpose (generating scenarios and alternative options to counteract the narrowing of considered futures), which is more than a tautology of the name. However it is expressed abstractly and does not distinguish this tool from the many near-identical siblings (future-expander, futures-spectrum-expander, futures-broadener, horizon-expander), so an agent cannot tell which one to pick.

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?

There is no statement of when to use this tool, when not to, or which sibling it replaces. Given the dense cluster of expander/widener tools, this omission is significant for routing.

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