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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states the action and algorithm families; it does not describe accepted algorithm formats, default behavior, return format, or whether the input is the data to hash or the algorithm name.

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 very concise and front-loads the core action. The leading "Hash:" label is somewhat redundant with the tool name, but otherwise there is no 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 tool with no annotations and no output schema, the description should explain invocation details more thoroughly. It omits the input payload, accepted algorithm values, and output representation, making it difficult for an agent to call correctly without additional information.

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 coverage is 100%, so the baseline is 3. The description adds algorithm examples beyond the schema's thin "Algo to process" wording, but it still leaves ambiguity about the meaning of the single parameter and how the data to be hashed is supplied.

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 states a clear verb and resource: "Compute hash digests," with SHA256 and MD5 as concrete examples. It does not explicitly differentiate from siblings like x402-hash-file or x402-keccak256, and it never identifies what data is being hashed.

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 guidance is given about when to use this tool versus alternatives such as x402-hash-file, x402-keccak256, x402-pbkdf2, or x402-scrypt. The description implies generic hashing but provides no exclusions, prerequisites, or selection criteria.

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