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

Annotations already declare destructiveHint=true, and the description does not contradict that. It adds useful context that the action sends an email to a signer, requires a pending request, and uses a specific API endpoint, but it does not explain what the destructive hint means operationally or describe side effects beyond the email.

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?

Two tightly written sentences with the core action front-loaded and the API endpoint as supporting detail. Every sentence earns its place and there is no wasted language.

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 two-parameter mutation tool with full schema coverage and no output schema, the description covers the essential action, target, and endpoint. It could go slightly further in clarifying the destructive/irreversible nature hinted by annotations, but it is otherwise complete for correct invocation.

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 both required parameters fully. The description embeds signature_request_id in the endpoint path but adds no additional meaning, constraints, or format guidance beyond what the schema provides, so the baseline 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 states a specific verb and resource ('Sends a reminder email') and scopes it to a signer on a pending signature request. It is immediately distinguishable from siblings like cancel, get, list, and send_with_template without needing to inspect the 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?

The phrase 'for a pending signature request' implies the context in which this tool applies, but there is no explicit when-to-use guidance or alternative comparison. An agent can infer usage from the pending-request qualifier, yet no exclusions or sibling routing are provided.

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