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

With no annotations, the description carries the burden of behavioral disclosure. It reveals that the tool requires payment (x402, $0.05) and mentions the call endpoint and free trial units, which is useful. However, it does not clarify whether the operation is read-only or any other side effects, and lacks info on error responses or rate limits.

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 somewhat marketing-heavy ('The institutional DeFi layer') but every sentence provides relevant information: premium status, payment method, endpoint, and free units. It is front-loaded with the premium notice and does not waste words, though it could be tighter.

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 simple tool with one optional parameter and no output schema, the description covers the essential context: what data it returns, the payment requirement, how to call it, and a free trial offer. It lacks details about response format, but given low complexity, it is adequately complete.

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?

The schema fully documents the only parameter (limit, default 15), so schema coverage is 100%. The description adds no additional detail about the parameter or its behavior, which matches baseline expectations for well-documented schema.

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 states that the tool provides 'Tokenized treasury and Real World Asset yields' and lists specific providers (BlackRock, Ondo, Maple, etc.), which distinguishes it from sibling tools like stablecoin_yield or chain_yields. Though it lacks an explicit verb like 'get' or 'list', the intent is apparent.

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?

The description implies use cases by naming RWA-focused protocols, but it does not explicitly state when to choose this tool over alternatives. No exclusions or comparisons to sibling tools are provided, leaving the usage context somewhat implicit.

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