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

With no annotations, the description carries the full burden and does disclose real behavioral traits: cost ($0.001 per call), payment rail (x402/USDC on Base), and that the response carries a provenance chain and Ed25519 attestation. The one gap is that 'for one date' is not reconciled with the start/end parameters in the schema.

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?

Two front-loaded sentences with no filler: what is returned first, then pricing and provenance. Efficient, though the 'for one date' framing is slightly imprecise given the range-style parameters.

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?

There is no output schema and no annotations, so the description must do everything; it does cover cost, payment, and response authenticity, but it never explains the start/end parameters or whether a date range is supported. Adequate but with a material gap for a paid lookup 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 coverage is only 33% and the start/end parameters have no description in either the schema or the description, leaving how date scoping works unresolved. The description even asserts 'for one date', which sits awkwardly beside a start/end pair; only the payment parameter gains indirect context from the pricing sentence.

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 verb+resource ('US Treasury Debt to the Penny record') and enumerates the exact contents returned (total public debt split into intragovernmental holdings and debt held by the public). It is immediately distinguishable from time-series siblings like cpi_us_monthly or state_gdp_series.

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 phrase 'for one date' implies the use case is a single-date query, which implicitly contrasts with the series-based siblings, but no alternative tool is named and no when-not condition is stated. This is implied usage rather than explicit guidance.

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