isw_fintech_compute_mac

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

No annotations exist, and the description only states the operation without disclosing side effects, idempotency, authentication needs, or rate limits. For a compute function, it's ambiguous whether it's a pure function or has external dependencies.

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, no fluff. However, being too concise sacrifices informational value.

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?

No output schema, and the description does not specify return type (e.g., hex string), error conditions, or behaviour with invalid parameters. For a cryptographic HMAC tool with 5 parameters, this is insufficient.

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 only 20% (only 'confirm' has description). The description adds 'over ordered fields' hinting at 'fields' parameter usage, but does not explain the role of 'secret', 'payload', or 'algorithm' beyond schema defaults. With low coverage, more parameter context is expected.

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 an HMAC for Fintech Card Processing over ordered fields, distinguishing it from transaction or card management siblings. However, it could specify that it's a cryptographic utility.

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 implies usage when an HMAC is needed for fintech card operations, but provides no explicit context on when to use this vs other validate tools, nor any prerequisites or alternatives.

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