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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds genuinely useful behavioral context beyond annotations: the operation is deterministic, and it is a paid resource with an explicit $0.002 per-call cost. This is valuable extra disclosure.

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?

Three sentences with no filler, and the most important framing ('Paid deterministic') is front-loaded. The only minor redundancy is mentioning 'Paid' twice, first in the opening phrase and again as 'Paid resource; x402 price...', but overall the description is tight and structured.

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?

Given the tool's complexity—4 parameters, nested objects, an enum, no output schema, and a name suggesting policy-versus-control behavior—the description is incomplete. It omits the meaning of mode, policy, protocol, offers item structure, and the result/ranking return shape. An agent could understand the high-level purpose but would still be unsure how to invoke the tool correctly.

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 undocumented parameters. It mentions 'offers' as caller-supplied candidates and names the constraints applied, but it does not explain the mode enum (policy vs. control), the policy object structure, the protocol parameter, or the expected shape of the offers array. This is insufficient for constructing a valid 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 uses a specific verb ('applies', 'ranks') and a specific resource ('caller-supplied candidate offers'), and it states the exact constraints enforced: maximum price, minimum reliability, minimum trust, and maximum latency. It does not explicitly differentiate from siblings like procurement_policy_engine_692ceeb3 or procurement_router, but it is specific enough to convey what the tool does.

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 no when-to-use guidance, no exclusions, and no mention of alternatives. It says the tool is paid and acts on caller-supplied offers, but it never helps an agent decide between this tool and the many similar procurement/policy sibling tools.

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