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

Annotations already indicate a safe read, and the description adds meaningful behavior beyond that: the $0.03 USDC x402 payment requirement and the fact that unpaid calls return payment terms instead of data. This is valuable context not present in the schema or annotations.

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 three tight sentences: payment warning first, then output definition and data basis, then unpaid-call behavior. No filler or redundant schema text.

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 single-parameter read-only classification call, the description covers the output categories, the computation basis, the cost, and the no-payment fallback. There is no output schema, but the semantic outputs are stated well enough to interpret the response.

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?

Asset is fully documented in the schema with an enum and description (100% coverage), so the description adds no parameter information. This matches the baseline for high schema coverage.

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 names a specific resource (market regime classification), lists the exact output categories (chop / trend_up / trend_down / high_vol), and adds a grid-suitability verdict, so an agent knows what the tool does. It does not differentiate from sibling crypto_regime, so not a 5.

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 choose this tool over crypto_regime or related risk/sentiment tools, and no exclusions or alternative routing. The only context is that it uses live 24h market structure, which is implied rather than stated as a usage condition.

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