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

The readOnlyHint annotation already establishes this is a safe read. Beyond that, the description discloses a non-obvious behavioral trait: PHOTO-type answers are transformed into fetchable image URLs, and those URLs are not directly viewable without another call. It omits error behavior and any rate/limit context.

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 tight sentences, front-loaded with the core action and followed by the one non-obvious caveat. No filler or restated boilerplate.

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 single-parameter read-only tool, the description covers the action, the shape of the return (questions + latest answers), and the photo-URL caveat. Missing is any note on what happens for an invalid or nonexistent checkInId, but no output schema exists to carry that burden elsewhere.

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 0% and the description adds nothing about checkInId — no format, no source, no example. With only one parameter and zero coverage, the description should compensate but does not; the possessive "a check-in's" only implies an identifier is required.

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?

States a specific verb and resource ('Get a check-in's questions + latest answers'), which clearly distinguishes it from siblings like list_checkins, create_checkin, and schedule_checkin. The scope of the returned data (questions and latest answers) is explicit.

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 provides concrete workflow routing: photo answers resolve to URLs that must be 'passed into get_client_images to actually view them,' which names an alternative tool and the condition that triggers it. It does not compare itself against list_checkins or note prerequisites, so it falls short of full when/when-not guidance.

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