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

With no annotations, the description carries the full behavioral burden. It discloses that the tool is free and names the volatility data sources (Deribit DVOL), but it does not mention authentication needs, rate limits, caching, or error behavior. These gaps are meaningful but not severe for a simple read-only market data query.

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 a single efficient sentence with no wasted text. It front-loads the free-tier note and then lists the key data points and supported underlyings, making it easy to scan.

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 absence of an output schema and annotations, the description should do more to explain the return format, units, and response structure. It adequately describes what metrics are returned and for which assets, but leaves output shape and operational details unspecified.

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 0%, so the description must compensate for the single required parameter. It does so by explicitly stating the accepted values 'BTC, ETH or SOL', which clarifies the underlying enum and ties the parameter to the asset being queried.

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 clearly identifies the tool's output: live spot, Deribit implied volatility (DVOL), and 30-day realized volatility for BTC, ETH, or SOL. It lacks an explicit verb and does not distinguish this snapshot from siblings like price_note or preview_note, but the resource set is specific enough for an agent to understand the tool's function.

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 versus the sibling tools price_note or preview_note. The word 'Free' hints at a pricing tier but does not specify conditions, alternatives, or exclusions for invocation.

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