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

Annotations only cover readOnlyHint and openWorldHint. The description adds the two things that really matter and that annotations cannot express: a $0.15 USDC x402 cost on Base mainnet, and the exact failure mode (PaymentRequired challenge) plus recovery path (retry identical call with signed payload in _meta['x402/payment']). That is precisely the behavioral context an agent needs before invoking.

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, then outputs, then payment mechanics — a logical order with no wasted preamble. Slightly dense, and 'DeepSeek-synthesised, ICD-203 language' is flavor rather than actionable, but it is brief.

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?

Even with no output schema, the description enumerates the returned fields, states the cost, and documents the payment error path. For a two-parameter read-only tool this leaves no operational gap.

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 100% with only two documented parameters, so the schema already carries all parameter meaning. The description adds no syntax or filtering detail beyond what the schema states. Baseline 3 is appropriate.

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 (risk assessment) and resource (OT/ICS supply-chain vendor), plus the concrete outputs (risk tier, confidence, cited CVEs, threat actors, mitigations). However it never distinguishes itself from the obvious sibling getVendorRiskDelta, leaving the agent to guess which one to call.

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?

Usage is implied by the OT/ICS supply-chain framing, and the description gives procedural guidance for the payment retry loop. But it never says when to prefer this over getVendorRiskDelta or when a vendor risk assessment is appropriate vs other intelligence tools.

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