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

Annotations already state readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false. The description adds useful timing context (post first job run) but does not disclose error behavior, permission needs, or what happens if the check-in has not arrived.

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 a single, efficient sentence with no wasted words. It is front-loaded with the usage condition, though it could be strengthened by leading with the tool's purpose.

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?

The tool is simple, and the schema, annotations, and output schema cover most structured details. The description supplies usage timing but omits what the tool returns and how it differs from list_check_ins, leaving a small but meaningful gap.

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 single parameter checkInId is fully documented in the schema, including that it is returned by add_check_in or list_check_ins. The description adds no parameter meaning beyond that, so the baseline of 3 applies given 100% schema coverage.

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 only says when to use the tool ('after running the job once') rather than stating the operation it performs. It implies confirming a check-in but never says it retrieves a check-in record or what information it returns. The purpose is therefore vague, though not a pure tautology.

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 gives a clear condition for use: after running the job once, to confirm that the first check-in arrived. However, it does not name alternatives such as list_check_ins or add_check_in, nor does it say when not to use this tool.

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