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

With no annotations and no meaningful description, the tool's behavior is entirely undisclosed. The agent cannot know whether this is a pure computation, requires network access, mutates state, or returns a specific format.

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 extremely short, but this is under-specification rather than concise clarity. It is a tautological phrase that saves space at the expense of all useful information.

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 two-parameter tool with no annotations and no output schema, the description is completely inadequate. It does not explain what extrapolation method is used, how 'x' and 'points' should be formatted, what the result will be, or how this relates to similar tools.

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 baseline is 3 even though the tool description contains no parameter information. However, the schema descriptions are generic ('X to process', 'Points to process') and the body text adds nothing beyond that.

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 'Extrapolation: Extrapolation', which merely repeats the tool name and provides no verb, resource, or action. It does not say what the tool computes, what inputs it expects, or how it differs from siblings like x402-interpolate.

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 about when to use this tool or when to prefer an alternative. No context, prerequisites, or exclusions are mentioned.

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