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

The readOnlyHint annotation already signals safety, but the description adds only domain context (standards, price) and no behavioral details such as what action it performs, what it returns, or how the payment_tx_hash parameter fits into a read-only operation. It does not contradict the annotation, but it 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 very short and front-loaded with the key resource name. There is minor redundancy between 'prix marché USD/unité' and 'Prix : 0.100 USDC', but overall it wastes little space, though it may be too terse to be fully useful.

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, the description should explain what the tool returns, but it only lists topic labels and a price. It also leaves the payment_tx_hash parameter's role unexplained, creating a significant gap for a tool that combines read-only annotation with a payment-related input.

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% for the single parameter payment_tx_hash, so the schema already documents it. The description adds no parameter-level meaning, and notably does not explain why a payment hash is present in a supposedly read-only tool, but the baseline of 3 applies because the schema carries full parameter 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 identifies the resource (Caribbean biodiversity credits) and scope (TNFD, Plan Vivo, Verra, NatureMetrics, market price), which is clearer than the name alone. However, it lacks an explicit verb such as 'retrieves' or 'lists', and does not clearly distinguish itself from the sibling tool caribbean_get_biodiversite.

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. It does not name conditions, exclusions, or compare with related tools like caribbean_get_biodiversite, leaving the agent to infer usage from the resource label.

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