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

Annotations already declare readOnlyHint=true and destructiveHint=false, and the description adds meaningful behavioral context: acknowledgment is read-only and can only be set by the human through a specific action. This goes beyond the annotations by explaining the mutability boundary and the mechanism for acknowledgment.

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 compact and front-loaded: the first sentence states the core behavior and output, the second gives the use cases, and the third clarifies a key constraint. No redundant wording or filler is present.

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 simple status-checking tool with two parameters, the description covers the domain, the read-only constraint, and the status vocabulary. It does not detail the exact return shape, but since no output schema exists, a bit more formatting detail would be helpful; overall it is still adequate.

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 description coverage is 100%, so the schema already documents reminder_id and step sufficiently. The description does not add significant new parameter semantics beyond what the schema provides, making the baseline score of 3 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 clearly identifies the tool as reporting per-step delivery and acknowledgment status for a live occurrence, naming the exact statuses it returns. This distinguishes it from siblings like get_reminder and list_reminders by focusing on delivery/acknowledgment state rather than reminder content or collection.

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 explicitly states the tool answers 'did that reminder go out?' and 'have they responded yet?', which are concrete use cases. It does not name alternative tools or explicit when-not-to-use conditions, so it stops short of full routing guidance.

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