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

No annotations and no behavioral detail at all: nothing about what 'future' is relative to (now, a supplied date, timezone), what the return value is, or how the two inputs interact. The description carries the full burden and supplies nothing.

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 text is a single redundant clause repeating the name twice. It is short but not concise in any useful sense — it front-loads nothing and contains no informational content.

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 2-parameter tool with no annotations and no output schema, an agent needs to know the comparison basis, input roles, and return type. None of that is present, so the definition is unusable for correct invocation.

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 coverage is 100%, so both parameters (date, value) are documented in the schema, giving a baseline of 3. However, the description contributes zero meaning about what 'date' and 'value' mean for a tool called 'is-future' — the generic placeholder names ('value to process') actively obscure intent, warranting below-baseline.

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 is a tautology: "Is Future: Is Future" merely restates the title with no verb, resource, or scope. From the name alone an agent cannot tell whether this returns a boolean, a forecast, or a version check against a huge sibling set that includes many date and prediction tools.

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 guidance on when to use this tool, what inputs make it meaningful, or which sibling (e.g. x402-is-past, x402-is-today, x402-countdown) it complements. Nothing distinguishes it from the hundreds of other 'is-*' predicates.

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