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

No annotations are provided, so the description carries the full burden of behavioral disclosure, yet it says nothing about whether this is a pure computation, what it returns, whether inputs are mandatory, or how a VWAP series is derived. Zero behavioral context.

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 short only because it is empty; it is not concise but under-specified. No substantive content is front-loaded or otherwise present to earn its place.

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 computation tool with no annotations and no output schema, the description should at minimum explain the VWAP computation and input expectations. It provides nothing, leaving the agent unable to determine the return value or aggregation semantics.

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% (both 'price' and 'volume' carry descriptions), so the baseline of 3 applies. The description adds no meaning beyond the schema, but the schema itself documents the 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 'Vwap Calc: Vwap Calc' merely restates the tool name twice; it is a tautology that names a resource but gives no verb, no explanation of what VWAP is, and no distinction from the hundreds of sibling calculators.

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 it expects, or how it relates to alternatives like x402-weighted-average or x402-sma. An agent gets zero routing information.

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