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

The description explicitly says 'Uses buyer-supplied information only; no external research or outbound actions', which contradicts the openWorldHint=true annotation indicating the tool may leverage external/world information. Although it adds useful context about payment authorization and returning a draft for review, the contradiction makes the behavioral disclosure unreliable.

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 four short sentences and front-loads the core ranking action before limitations, output, and cost. It is slightly redundant in repeating the no-external-research idea, but every sentence adds relevant information.

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 zero parameter coverage, the description should explain how inputs map to the ranking and what the returned draft contains, but it does not. The cost and wallet-authorization disclosure is helpful, but idempotency, result expiry, and signature behavior remain unexplained.

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%, and the description does not explain the input object fields (brief, source_text, audience) or the optional idempotency, expiry, and signature parameters. The only parameter-related insight is that payment requires explicit wallet authorization, which is insufficient compensation for five undocumented parameters.

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 states a clear verb and resource: 'Rank the supplied providers using transparent criteria and missing-data handling'. It also scopes the behavior by noting no external directory search, which helps distinguish it from search-based tools. It does not explicitly contrast with closely related siblings such as vendor_comparison or qualification_rubric.

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 implies the tool should be used when providers are already supplied and external research is not desired. The phrase 'Uses buyer-supplied information only; no external research or outbound actions' serves as an implicit exclusion, but no alternative tools or explicit when-to-use conditions are provided.

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