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

There are no annotations, so the description carries the behavioral burden. It meaningfully discloses the required ChainHelix API key, the cost-per-call payment options, the aggregation scope, and the window constraints. It does not explicitly say the operation is read-only or define the 'large events' threshold, but the main caveats are surfaced.

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 dense and contains no filler. Every sentence addresses either auth/cost requirements, output semantics, or parameter behavior. The payment sentence is long and appears before the tool's purpose, slightly hurting front-loading, but it is a necessary constraint for actual invocation.

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 two-parameter tool with a separate output schema, this description covers authentication, payment, aggregation, scope, and window behavior. A small gap is the unqualified term 'large events', which would benefit from a threshold or definition, but the description is largely complete for selecting and invoking the tool.

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 add meaning to the two parameters. It does: window is explained with units, default, and maximum, and omitting chain is explained as meaning all chains. The chain enum values are left to the schema, which is reasonable.

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 resource as stablecoin mints and burns per chain and coin over a time window, and it lists the returned dimensions: counts, total dollars, large events, and net mints minus burns. It is unambiguous, but it does not explicitly differentiate itself from adjacent siblings such as bridge_flows or whale_flows.

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 gives practical invocation guidance, such as window units, default, maximum, and omitting chain to cover all chains. However, it never states when to prefer this tool over a sibling tool or what conditions would make it inappropriate, so the selection guidance is implied rather than explicit.

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