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

The description adds meaningful behavioral context not present in annotations: the tool costs $0.001 USDC on Base or Solana and the input is bounded. Annotations already cover read-only, idempotent, and non-destructive behavior, so the added payment and bounding details go beyond them.

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 a single sentence with no filler. Every part contributes: the algorithm, the input type, the bound, and the cost/location of payment.

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 simple one-parameter hash tool, the definition is mostly sufficient: the required input is described and the operation is stated. However, there is no output schema and no mention of the digest's encoding format, which leaves a minor but real 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?

With 0% schema description coverage, the description must compensate, but it only says 'bounded UTF-8 text,' which largely restates the schema's string type and maxLength constraint. It does not clarify encoding, normalization, or any semantic nuances of the input parameter.

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 identifies the tool as computing a SHA-512 digest of UTF-8 text, and the algorithm name distinguishes it from siblings like sha256 and keccak256. However, it lacks an explicit verb such as 'returns' and does not specify the output encoding.

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?

No usage guidance is provided. There is no statement about when to choose sha512 over alternatives like sha256, keccak256, or hash_encode, and no exclusions or prerequisites are mentioned.

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