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

With no annotations, the description carries the full burden and does so well: it discloses coverage (OFAC SDN + OFSI), refresh cadence ('refreshed daily from official government sources'), return contents (list, program/regime, match score), and crucially the payment behavior and 402 challenge on unpaid calls. It stops short of explaining match-score semantics or rate/usage 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?

Front-loaded with purpose and data sources, then output shape, then operational/payment facts; no filler. Slightly dense with x402/MPP jargon, but each sentence earns its place for an agent that must know about the 402 payment challenge.

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 single-parameter tool with no output schema and no annotations, the description covers sources, freshness, return fields, and the pay-per-call/402 behavior — enough to call it and anticipate a challenge. The main residual gap is match-score interpretation and any request-format expectations.

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 100% but the only schema description is the bare 'required', so the description's clarification that the name can be a person or company is genuinely additive. However, it does not specify formatting (individual vs entity, aliases, transliteration), so the schema still leaves most input semantics unaddressed.

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?

States a specific verb and resource ('Sanctions screening: check a person or company name') plus the exact data sources (OFAC SDN, UK OFSI list), which no sibling tool covers. An agent can distinguish this from caselaw/EDGAR/legislation search tools at a glance.

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 'check a person or company name' framing implies entity-screening usage, but there is no explicit when-to-use or when-not-to-use guidance, nor any stated prerequisites such as needing a legal/entity name or how to interpret low vs high match scores. With no sibling screening tools, alternatives are moot, but the guidance is only implied.

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