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

The description is transparent about price, wallet authorization, and the draft-only output, but it directly conflicts with the openWorldHint: true annotation by stating 'Uses buyer-supplied information only; no external research or outbound actions.' If the annotation is taken at face value, the tool is supposed to have open-world behavior, while the description claims a closed, input-only world. This contradiction makes the behavioral contract unreliable for an agent.

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 compact, front-loaded, and every sentence adds value: what it compares, what inputs it relies on, what it returns, and what it costs. There is no filler or repetition of the tool name or title.

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 paid, non-idempotent, destructive-hinted tool with no output schema and zero schema parameter coverage, the description leaves too many operational gaps: how to authorize payment, what result expiration/signatures mean, what the draft output format looks like, and which field holds vendor proposals versus buyer requirements. It is a good surface-level summary but not sufficient for confident automated invocation.

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 compensate for the five undocumented parameters. It does not explain what 'brief' versus 'source_text' should contain, how they relate to requirements/proposals, or what 'result_expires', 'idempotency_key', 'result_signature', and 'payment_signature' are for. Only the price line hints at payment-related authorization, which is not enough to reliably construct a correct call.

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 opens with a specific verb and resource: 'Compare supplied vendor proposals against explicit requirements, cost components, risks, and unanswered questions.' This clearly distinguishes it from adjacent siblings like competitor_comparison, provider_shortlist, and proposal_review_agent by focusing on vendor proposals and comparison criteria. The scope is precise enough that an agent can identify when this tool applies.

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 'Compare supplied vendor proposals...' implies the intended use case, and 'Uses buyer-supplied information only; no external research or outbound actions' gives useful context for when this tool is appropriate. However, it never explicitly names alternatives or states when NOT to use this tool, so the 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.