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

With no annotations, the description carries the full burden, and it delivers: it states deterministic execution, 'no LLM,' exact cryptographic operations, Base-payment confirmation, completeness in one call, and the $0.01 USDC x402 cost. This goes well beyond the structured schema.

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 verification scope is front-loaded and every sentence adds information (checks, completeness, determinism, cost, free alternative). It is somewhat long and technical, but there is no real filler.

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 cryptographic verification tool with no output schema and no annotations, the description should clarify what the agent must put in `task` and what the response looks like; both are missing. Otherwise, the operational details, cost, and determinism are well covered.

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?

The schema has 100% description coverage for the only parameter, so the baseline is 3, but neither the schema text ('Task/query text for this SKU') nor the tool description explains how to supply a specific receipt/proof_id. The description adds detailed behavior but no parameter guidance, so it remains at baseline.

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, 'Verify a BlindOracle receipt,' and enumerates concrete checks that distinguish it from similar attestation/verification tools (append-only proof rail, payload hash, HMAC-SHA256, Base payment). This leaves no doubt about 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?

It gives a clear use context: buyers need the parts they 'cannot check alone,' and it explicitly points the self-checkable portion to a free published skill instead. It does not name sibling tools or explicitly list exclusions, so it is not a full 5.

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