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

The annotation readOnlyHint=true already signals a safe read operation. The description adds some context (market data specifics) but fails to explain the role of payment_tx_hash in a read-only tool or whether any external calls are made. It does not contradict the annotation, but also does not meaningfully disclose behavior beyond it.

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 short and mostly to the point, but it is structured as a series of fragments (e.g., 'Marché 2.1 Mds$. Prix : 0.050 USDC.'). It lacks a leading sentence that states the tool's purpose, making it feel disorganized despite its brevity.

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?

With no output schema and an unexplained optional parameter, the description is incomplete. It leaves the agent unsure what the response will contain or why a payment hash is needed. The specific figures (2.1 Mds$, 0.050 USDC) are ambiguous—whether they are constant outputs or examples is unclear.

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 has one optional parameter with a short description ('Hash tx USDC Base'). Since schema explanation coverage is 100%, the baseline is 3. The tool description does not elaborate on the parameter, so no additional value is added.

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 conveys that this tool is about the Caribbean vanilla market with specific details (prices, harvest, certifications, channels). However, it lacks an explicit verb like 'get' or 'retrieve', reading more as a fragment than a clear purpose statement. It does distinguish from sibling tools by naming vanilla specifically.

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?

No guidance is provided on when to use this tool versus alternatives. There is no mention of prerequisites, scenarios, or exclusions. The description simply lists market details, leaving the agent to infer usage from the tool name.

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