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

Annotations provide readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering safety. The description transparently discloses the cost ($0.001 USDC) and payment networks (Base or Solana), which is crucial behavioral context not in the annotations. It implies determinism but idempotence is already annotated. No hidden side effects are disclosed; the payment requirement is a strong addition.

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?

Single sentence is succinct and front-loads the cost, which is a key differentiator. However, it packs many concepts (normalization, digest, payment, networks) without elaboration, which slightly reduces clarity. Acceptable length for a simple tool.

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 a single free-form parameter and no output schema, the description should provide more context about expected input/output. It fails to mention the canonicalization standard (e.g., JCS), the output format (hex digest?), or how the digest is computed. This is inadequate for an agent to confidently call it without further examples or schema hints.

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?

With 0% schema description coverage and a single 'value' property of empty type, the description adds minimal meaning. It doesn't clarify what format 'value' should take (JSON string, object, number?), nor whether it must be a JSON-compatible type. The description mentions 'JSON normalization', implying 'value' is JSON data, but lacks type guidance or examples.

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?

Description states the tool performs JSON normalization plus SHA-256 digesthol, but the term 'canonical JSON normalization' is ambiguous without specifying the canonicalization algorithm (e.g., JCS, JSON Canonicalization Scheme). It suggests a specific resource but doesn't name the standard, making distinction from similar tools like sha256 and hash_encode unclear.

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 provides no guidance on when to use this tool vs alternatives like sha256, hash_encode, or json_schema_validate. No mention of use cases, exclusions, or prerequisites (e.g., input must be valid JSON, network fees). The $0.001 cost implies paid usage but not explicitly framed as a consideration for when to choose it over free alternatives.

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