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

With no annotations, the description carries the full burden and delivers: the server is NOT in the reply path so the reply cannot be fabricated by the issuer, the response returns verificationCode, the requester must verify the sender's domain (which the server deliberately does not disclose), and timing is non-deterministic. This is unusually rich behavioral context for a mutation-like call.

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?

Dense but front-loaded: purpose first, then the trust model, then the return value, then caveats and calling instructions. Every sentence carries load, though the mixed English/Korean tail is slightly redundant with the body.

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 no annotations, yet the description still covers the return value (verificationCode), the trust/verification procedure, timing expectations, and pre-call requirements. An agent has everything needed to call it correctly and interpret the result.

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% (the single ownerEmail is documented in the schema), so the baseline is 3. The description goes further by explaining why the field matters — the auditor replies directly to this address, and it is the requester's own mailbox — adding operational meaning beyond the schema's brief Korean gloss.

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: 'ask the independent auditor to confirm the reserve report by email.' It distinguishes itself from siblings by tying its output to get_attestation ('hash/as-of match get_attestation'), so an agent can place it in the workflow without opening other schemas.

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?

Gives concrete invocation guidance: 'Ask the user for their email before calling; call once per report,' plus expectations ('May take business days; may not be answered'). It references get_attestation for cross-checking but does not explicitly state when to prefer this over get_reserve/get_attestation, leaving a small gap.

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