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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered; 'read-only' merely restates it. The one genuinely additive detail is that the call is free, plus a hint that output is structured. Auth requirements, rate limits, and behavior on an invalid or mismatched receipt are not disclosed.

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?

Two tight sentences with the action front-loaded and no padding. The second sentence partially duplicates the readOnly annotation rather than earning new information, which keeps it just below a top score.

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?

With no output schema, the description is the only place to explain the verification result, yet it only calls it 'machine-readable'. The required receipt is a nested object whose expected contents (and the semantics of verification success versus hash mismatch) are never described, leaving real gaps for a verification tool.

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%, so the schema already documents receipt, expected_hash and network; baseline is 3. The description's reference to a 'receipt digest' loosely ties to expected_hash but adds no format, matching, or precedence guidance beyond the schema.

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 and resource ('Verify a PrivateDAO receipt digest') and says what comes back ('machine-readable verification result'), which is far better than a tautology. It does not, however, distinguish itself from the siblings get_receipt and verify_basic, which an agent will immediately weigh against it.

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 'This is free and read-only' gives a soft reason to prefer this path, and the verb implies the verify-a-receipt use case. But there is no explicit when-to-use versus get_receipt or verify_basic, and no stated prerequisites (e.g. needing a digest from a completed job).

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