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

With no annotations, the description carries full burden and does an excellent job. It discloses the signed verdict (Ed25519), non-custody behavior, output format (PASS/REVIEW/FAIL + risk score + quote), and cost ($0.25 USDC). These are substantive behavioral traits beyond basic read/write.

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 front-loaded with the core purpose and then efficiently packs behavioral details, output, safety, and pricing. The markety line 'The check a serious agent runs before moving real money' adds a bit of positioning but no functional loss. Overall concise.

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?

The description covers inputs, what the tool does, the output (verdict + risk score + quote), and important traits (signed, non-custody, cost). Since there is no output schema, it reasonably describes the return. It stops short of detailing the exact risk-scale or error conditions, but is complete for the tool's complexity.

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% and each parameter has a meaningful description. The tool description essentially restates the required/optional nature ('recipient + amount' and optional contract/agent id) without adding new semantic detail beyond the schema, so the baseline 3 applies.

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 clearly states a specific verb+resource+outcome: 'Secure-transaction RAIL: one signed clearance before an agent sends funds.' It distinguishes itself from sibling tools by emphasizing it is the pre-payment security check that returns a verdict and signed clearance, not merely a transaction or audit tool.

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?

Provides clear usage context: 'Give recipient + amount ... the check a serious agent runs before moving real money.' It implies exactly when to use (before sending funds), but does not explicitly name sibling alternatives or state when not to use, so it misses full exclusion guidance.

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