x402node_crypto_hmac

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

No annotations are provided, so the description carries the full burden. It does not disclose whether the tool is read-only, if it modifies state, or any side effects. It mentions a price note but lacks typical behavioral traits like authentication needs or rate limits.

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 brief and front-loaded with keywords. The price note is slightly extraneous but does not impede clarity. It efficiently conveys the tool's purpose without unnecessary verbosity.

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 HMAC calculator, the description covers algorithm choices and use cases. However, it does not describe the output format (e.g., hex string). Given no output schema, this omission reduces completeness.

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 schema already documents parameters. The description adds context about algorithm options and default, but does not significantly enhance meaning beyond the schema descriptions. Baseline score of 3 is appropriate.

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 states it computes HMAC using standard hash algorithms, and lists common use cases like API request signing, webhook signature, and JWT signature. It distinguishes itself from sibling tools which are unrelated (e.g., astrology, text manipulation).

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 specific use case contexts (signing, authentication), which helps the agent decide when to use this tool. However, it does not explicitly state when not to use it or provide alternatives, but given sibling tools are unrelated, the guidance is sufficient.

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