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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered. The description adds real value beyond them: no request is created, nothing is sent, the preview must survive the connection step and be forwarded unchanged (an idempotency-preserving constraint), and invalid details must be corrected first.

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?

Three short sentences, front-loaded with the scope disclaimer before the workflow instruction. The closing 'Missing or invalid details must be corrected' is the vaguest line and restates an obvious validation expectation, but nothing is padded.

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?

With no output schema, the description usefully explains the preview that comes back and how to carry it forward, and it clarifies the non-sending semantics. However, for a nested-object tool at 0% schema coverage it stops short of describing the document/checklist item structure or any field constraints an agent must satisfy.

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 0% for a single nested object with many subfields, so the description carries the burden. It names recipient, checklist, deadline and optional message, which maps to recipientName/Email, documents, deadline and message, but leaves title, recipientLanguage, and all document subfields (doc_type, required, coverage_days, maxItems=10) unexplained.

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?

Specific verb+resource (prepare/edit a request preview) plus an explicit boundary: 'No request is created and nothing is sent.' It names the sibling it hands off to (review_request), so an agent can place it in the flow without opening any other schema.

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?

States the ordering constraint clearly: prepare 'before connecting,' then keep the returned preview through connection and pass it unchanged to review_request. It does not explicitly distinguish itself from get_request or send_request as alternatives, but the sequencing context is unambiguous.

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