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

No annotations are provided, so the description carries the full behavioral burden, yet it discloses nothing about output encoding (hex vs base64 vs raw), determinism, default algorithm, or what happens when 'algo' is omitted. For a pure-compute tool the risk is low, but the missing output contract is a real gap.

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?

A single short, front-loaded sentence with no filler. It is efficient, though arguably too terse to carry the necessary detail.

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 two-parameter compute tool with no output schema, the description is minimally adequate but omits the return format and the algorithm default/validation rules. Both parameters being optional with no explanation of behavior adds ambiguity.

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%, but the schema text is bare ('Algo to process', 'Text to process'). The description adds marginal value by naming actual algorithm values (SHA256, MD5), but does not clarify whether either parameter is required or what the default algorithm is.

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 ('Compute hash digests') with concrete algorithm examples (SHA256, MD5). However, it does not differentiate from close siblings like x402-hash-file (file hashing) or x402-hash-generator, leaving the agent to guess which hash tool to pick.

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?

There is no guidance on when to use this versus x402-hash-file, x402-hash-generator, x402-keccak256, or x402-pbkdf2. No prerequisites, defaults, or input assumptions are stated.

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