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

With annotations indicating it is not read-only (readOnlyHint=false), not idempotent, and not destructive, the description adds value by noting that the automatic schedule continues after this call, preventing the agent from thinking it disables automation. It also discloses the return value, though the output schema already provides that. The description doesn't mention potential side effects like duplicate reminders, but with the annotations, the bar is lower, and this is adequate.

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 concise with three sentences, front-loading the core purpose and usage context. It includes the return value in the last sentence, which is efficiently placed. No redundant information; every sentence contributes to understanding.

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?

Given the tool's moderate complexity, the description covers purpose, usage, behavioral notes, and return value. The output schema already documents parameters and return type, so no further detail is needed. It could mention that channel is always 'email' but that's in the schema; the description is complete enough.

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?

The schema already documents both parameters: channel is an enum limited to 'email', and intake_id references define_intake. The description does not add additional meaning beyond that, but since schema coverage is 100%, the baseline of 3 is appropriate. No further explanation is needed.

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 the verb (send), the resource (reminder), and the context (manual nudge outside automatic schedule). It distinguishes itself from automatic reminders and from sibling tools like update_intake or get_intake_status, so an agent can confidently select it for this specific action.

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?

It explicitly specifies when to use: when a deadline is approaching and the client has not responded, or when SMS is needed after email failures. It also clarifies that the automatic schedule continues, so the agent knows this is an extra nudge, not a replacement. This directly guides decision-making among alternatives.

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